Flood mitigation and stormwater

could be to um to mitigate flood zone or flood plane areas by 50%

decide when market forces, existing programs or other tools that are already exist could help to address those flooded conditions

I mean that's some of what we're doing in on the other topic on the greenways and the flood control systems

the regulatory requirements as far as what the city has to do are then written into the stormwater MS4

That includes overseeing erosion control on construction sites, implementing stormwater treatment facilities like fire retention and detention ponds

pause construction on the dam and flood control project at CU South until the Supreme Court decides

remove the $76.5 million budget item for the dam and the South Boulder Creek flood mitigation project from the 2027 budget document

For decades, the city council and utilities department have arrogantly ignored constructive and expert citizen feedback on the South Boulder Creek project

the flood and storm water master plan. Great example of that.

like she mentioned like the flood plane issue in that case

flood plane regulations, um, and things like the ADU, um, uh, size

how much is um is constrained by flood or other considerations or whatever

I know it's significantly impacted with a high hazard and conveyance zone, but what is that?

As a requirement of annexation, a flood control easement is required to be dedicated to the city that covers the conveyance

7% for storm water flood management utilities to support the utilities enterprise

Two community votes have been taken on it to further support the building of flood mitigation along South Boulder Creek.

The actual mitigation has to happen at the other end of the property to allow the water to flow through.

that there is an easement in there for a I believe it's a storm sewer easement between the it's actually running between the buildings

And so we have to keep our parking above that base flood elevation

which is very significantly impacting the site, not just as a medical center, but for housing

been flooding in that area. They actually bumped this part of the project up for them so it coincide with ours.

so one of the big aspects of this project is working to mitigate that through a trestle fix

I am not allowed to put anything on this site until the flood plane is uh fixed

can't build anything within the flood zone before you get the flood improvements done

It's absolutely essential for that zone. However, the plan that has been pushed through is really upsetting for many of us.

regarding the CU South flood mitigation uh plan that's been pushed through

I understand why the flood mitigation project is necessary.

include the South Boulder Creek flood mitigation, the sanitary sewer rehab project, our treated water transmission

The renovation will in partnership with utilities and storm water efforts happening with Goose Creek

sewer and water pipelines, traffic signals, street lights and pavement to name a few on that short on that list.

7% for storm water flood flood management utilities to support the utilities enterprise.

South Boulder Creek Flood Mitigation Project Update (15 min)

Uh yeah, there's there's nothing the city can do as far as uh you know flood related uh regulations because there's nothing to u uh to review against.

I want to like do even more for wildfire and flood mitigation from the airport and solar and other technologies

For example, above the blue line, uh flood easements and lots

even more so if we added flood would cause the community to be concerned

I think specifically with flood and fire only because those are the two that we have highest measured risk

What's missing is the other natural disaster that we are afflicted with, which is flood.

the building is already elevated to meet floodplain requirements

submitted a pre-application to understand all of the regulatory requirements. It is in the floodplain.

it's actually essential that the property become a landmark to allow the required level of investment in it due to its restrictions in the floodplain.

And here you can see this property, is impacted by the, the city's floodplain regulations.

do you mind if I, like, say one quick thing about the floodplain

The other thing we need to address is stormwater

then you've got a multi-million dollar say stormwater infrastructure improvement who's going to go and just build that for an entire area

Those parcels are very much impacted by the 100red-year flood plane.

it's part of our, stormwater… Dispersion feature, it's in… where the water discharges and gets spread out into the grass

it's more meant for stormwater, treatment than… Not active open space.

I believe you're, referring to the… there's a stormwater detention area, Let me just pull up that slide…

We're going to take care of the flooding that happens across the ball fields and the marshy areas

I know just anecdotally as a former coach for North Little League that those are the first

it was before Boulder created the designation of a high hazard flood zone

Then for stormwater, the monthly bill, it depends on the type of unit, so if it's a detached resident

And then for stormwater, we have water quality, flood, and conveyance.

we want to give you an update on where we are with conducting the water, the wastewater, stormwater, cost service study.

in-person versus Zoom, floodplain rules

FEMA allows the local municipality to administer those floodplain rules

it's super interesting how Boulder interprets the floodplain rules

the rule is, is that the, the finished floor has to be raised 2 feet above the base flood elevation

The foundation will raise the finished floor height to the required flood protection elevation

the building will be raised on a concrete foundation to meet floodplain requirement

You can see as an overlay, the blue is the 100-year floodplain, and the orange is the 500-year floodplain.

the staff noted in the memo that the finished floors of the buildings, the houses, have already met floodplain elevation requirements

Residential buildings in the 100-year floodplain must be elevated to or above the flood protection elevation.

it's served to move our first responders out of the high-hazard flood zone

in some cases, we're taking them down because they're in the high hazard flood zone

There's a detention or stormwater improvements that are planned for that area of the property

we did some additional infiltration testing, for stormwater and things to confirm

the drainage work that's happening in tandem and funded largely by utilities to the tune of, I think, a couple of million dollars

with several flooding events impacting the playground, the project team sought to protect

City and county protect people and property from flood hazards through the implementation of high-priority flood mitigation projects

Practicing do flood planning as part of this, too.

floodplain and flood management policies that describe the city and county commitments to effectively managing flood

Because all four of these houses flooded in 2013. They'll flood again, we don't know when, but they will.

It also shows this light blue, and this light blue is that 100-year floodplain. It's most of the property.

While looking at alternatives to demolition, the constraints identified were the floodplain height and cost of repair. This property is within the 100-year floodplain

The northern channel of Goose Creek is primarily a storm water and flood conveyance channel.

We must be secure from the constant risk of flooding, a reality we faced very painfully after the 213 flood.

Here's a map of the floodplain area. The site is just outside the South Boulder Creek floodplain.

During the floods in 2013, the water came up to our back door.

including oil and gas setbacks, flood plane regulations and airport airport influence areas

I would anticipate that flood would fit within that context

when somebody uses an excuse of, it's in the floodplain, and it's legitimate that they can't invest in it

regulations are intended to protect health, life, safety, and the high-hazard floodplain is kind of the most

It's more how do you develop safely within the floodplain.

Phase 0 is a flood mitigation project delivered in partnership with the City of Boulder, replacing an undersized culvert

the floodplain development permit for bringing the site, out of the floodplain

In terms of floodplain, here you can see these properties are currently impacted by the 100- and 500-year floodplains

And the Stormwater and Flood Management Utility provides and maintains effective stormwater collection and flood management.

the lawsuit with the flood detention system at CU South, and the impact that that will have on the stormwater utility fees

to support proper water conveyance and help prevent localized flooding within the transportation network.

it has been identified as being in the in the 100redyear and the 500year flood plane

because of The floodplain that it sits in, it's a critical facility

So to remain in place, typically, a building in the floodplain needs to meet FEMA's 50% substantial improvement requirements.

all four homes are located within the 100-year floodplain. And they were damaged in the 2013 flood.

the buildings are already elevated today, what's the difference between their current elevation and what it would need to meet the, the floodplain requirements

But we shouldn't be forgetting about flood risk, right? In our history, we've had at least two major floods

Okay, so I think there is a connection there.

So that's an example of a stormwater feature. You know, instead of paving everything with asphalt, you could put a permeable surface in there that would reduce runoff

almost the entire site is subject to FEMA regulatory floodplain, including floodplain Zone AE

So the integration of them, it's not physically feasible, given the floodplain constraints that we have.

the fact that it's senior housing, so you can't have senior housing, you can't have apartments in the floodplain

Water, wastewater, and stormwater management and flood control public facilities are guaranteed by an enforceable development agreement

half of the site sits in an area that's a floodplain

a lot of these areas in East Boulder are in the 100-year floodplain

This work will remove the site and 35 nearby properties from the flood plane and unlock the redevelopment

Reading all the stormwater from all those streets, so it's a very expensive proposition.

but that there's also some park use that's not inconsistent with the stormwater use of the property

for the area that's for storm water and parks land. It says that the storm water purpose is dominant

we're still gonna have a major catchment area that brings water underneath 9th

The dry creek bed is gonna be anywhere between a 25 to 100 year

with several flooding events impacting the playground, the project team sought to protect its future investment by addressing the stormwater infrastructure

The South Boulder Creek Flood Mitigation is essential for protecting over 2,300 residents and more than 260 structures

strive for the highest level of protection that you can get in its drainage

We'll start with floodplain and flood management, and I think the flood policies are a good example

because it's really designed with flooding in mind and with with being a part of that system

a space that can bounce back more easily after floods

We'll continue to study the floodplain, the high hazard, and what's possible at this corner.

This is pending some continued floodplain analysis, but ideally, this could be a structure

so much of this is in the high hazard that we have to go through a very lengthy federal process with FEMA

generally, what we've still heard feedback on, from last meeting on is policies related to floodplain and flood management

there was an inequity that came to our collective attention, the board, staff, council, around the way we charge stormwater fees

deal well with your infiltration and your stormwater, all the stormwater aspects of that as well

Fire and flooding, those are both catastrophic events

and the flooding effects of strip mall parking, that's something I really want to know

You know, we talk about the flood, but it was still, like, solvable,

But it's all under the flood code. It's not under the design code.

They were doing quite a bit of, flood and, like, revisions to the floodplain,

and the rating gardens for a nicer stormwater infiltration

Yeah, both, the pervious surface amount is improved, and the stormwater is dramatically improved.

everything's draining right to those homes. That's where the floodplain is

It didn't really fit, given our stormwater requirements and mitigating the floodplain

Concerns that they had were obviously flooding, because there's a floodplain pretty much on the majority of this property

And mostly, we know, you know, we're sort of focused on flooding.

Or, more floods, more severe flooding, and being able to, you know, incorporate swale or storage for water in certain parks

Protection and mitigation, and so similar, we've gone through a lot of recent, um, wildfires

the Gregory Creek Flood Mitigation Project for $9.7 million

does not support the proposed reduction in the flood control easement

The site is located within the 100-year and 500-year floodplains, which will require additional floodplain permitting and hydraulic modeling.

remembering that the floodplains is a relatively young utility compared to everything else

how are we designing around our floodplains, our floodways?

the storm water fund will support across the six-year horizon upper Goose Creek

Relocate the large stone trail marker. Marker is helpful, but being a milestone at the beginning of the Goose Creek Greenway Trail.

that coincides with these areas that are mapped as conveyance zone and 100year flood plane

they need to meet flood plane regulations and uh fundamentally comply with that

the process that's used to uh remove this piece of land or any piece of land from the flood map

Okay, if you're doing a flood… prone mitigation or something

It was, man, it was… flood in 2014, and now it's wildfire.

the resilience, like, against floods, and I know that there's been efforts to Identify, similarly.

timeline right now, the city's going through the flood mitigation project.

our flood and storm water master plan, which is still one of my favorites

the rain gardens that we'll need to incorporate to mitigate the stormwater runoff

the banks of Boulder Creek had not been built, and water often flooded the land

The 100 Year floodplain comes down from Skunk creek floods certain parts of that side of town

remodel the creek and do a clomer and a Lomer.

increases of 8% water utility, 6% wastewater utility and 5% of storm water and flood management utility

that the wastewater and stormwater rates would go up 27, and 28

a 5% increase in our stormwater and flood fund for next year

7 feet 10 inches of building elevation increase is required to get above the floodplain protection elevation.

we have to lift all the structures out of the floodplain above the flood. Protection elevation

In addition, the entire campus is in the hundred-year floodplain. So that affects everything that we're doing.

So our Flood Review staff has reviewed it, and they had no issue with with the location and the deck as it exists today.

The proposal includes maintaining an existing deck and retaining wall along the edge of the ditch which has been reviewed and approved by flood control staff

flood acquisition program is an example of we fund it every year we buy a property every month

that where we talked about what storm level are we designing for.

What standard is the flood management being built to?

a comprehensive public works and benefit and enhancement project that consists of parks and recreation and floodway benefits

repairs can include lining existing culvert pipes or applying waterproofing membranes

And we'll do flood proofing of underpasses. Sometimes we'll redeck pedestrian bridges.

You have these compounding threats, these compounding risks where you have a hillside burn, and then, as we know, then you get a rainstorm, and then you have severe flooding.

For both wildfire and flooding. It's been part of our DNA for quite a while to understand the probability of those risks.

The 500 year floodplain is the orange area, and and residential properties are not affected by 500 year

It had a very elegant system from from the the roof to the ground and the infiltration all over

And this was a stormwater detention management system throughout the country the United States that that boulder could use.

the 2022 comprehensive flood and storm water plan took a similar approach and and analyzed and ranked all of the

So we're not showing here the contribution from the Utilities department in terms of watershed work that will be done for plane work

we've identified a 20 year capital improvement program to address about 35 individual reaches

and then the flood program is designed at those majors floods that either are collecting flood waters

and then maybe pivot to the the last utility area on the stormwater and flood program

They also had flood impacts and did some flood mitigation work for the long term safety of the community.

The house is in the flood plain, so one of the benefits of designation is that some of the floodplain requirements for substantial improvements can be waived.

Oh, it's on a flood zone we have to give them a height amendment.

On this issue of The price for the stormwater and flood from the CU South Development

There are high functioning wetlands along the southern eastern property line and the site is impacted by the 100year 500year high hazard and conveyance flood zones.

the difficulty of getting stormwater requirements on sites.

But obviously the downstream capacity will always be a limiting factor until we are are fully built out.

that'll set us up to really tie in with our drainage infrastructure

one of the things that is under construction now is that flood channel which will convey a lot of that water

really our flood plane and high hazard. The high hazard is shown in blue.

transportation and mobility, flood plane considerations, historic landmarks and more

you say that that's for the flood changes, but that doesn't seem like right flood changes and also to provide frontage

the additional Broadway right ofway was essentially to uh create area for um flood improvements and to create frontage

managing stormwater and enhancing the vibracy and and creating places where people want to be.

it serves an incredible site of stormwater detention that does protect a lot of the area nearby homes

That month of August is flood mitigation at North Holder Park.

I didn't realize that the bandshell was in the high hazard or was in the floodplain.

I'm I'm curious, like the flood plain based on 100 year flood 100 year flood 100

I just wanna highlight the floodplain analysis. Specifically.

some have questioned the use of emergency status to pass the bond measure at hand but I would emphasize

I'm here on agenda item 3E in support of ordinance 8690 uh on storm water and flood bonds

concerned about approving bonds for the South Boulder Creek flood mitigation Project tonight because the project lacks a final design

one of the big changes in urban planning over the last 5 years, is a change in how we handle handle stormwater

And they got their demo because of the flood zone.

stormwater is measured, based on your area of imperviousness

Boulder has the highest flood risk in all of Colorado. and trees can help mitigate stormwater runoff.

a water main burst on Norwood Avenue and flooded a number of basements

a city water M burst a few feet from my mother's home and flooded the entire basement causing tens of thousands of dollars of damage

We received public comment that their current properties have water issues.

We are working very, very carefully with very smart people who have subject matter expertise in groundwater and floodwaters

the city of Boulder bought it to be able to control development with the intentions that it be used for stormwater, flood, mitigation, and parkland

one of the South Boulder Creek flood mitigation project is designed to provide protection for community members, property major utilities

In 2024 stormwater team completed year 3 of the 7 year cleaning and inspection cycle

the stormwater and flood utility provides and maintains effective stormwater collection and flood management systems which are critical within the city

they started actual construction on the green light. So that's the whole flood mitigation along balsam

We also looked at the existing conditions in terms of the floodplain that came up earlier.

they would have to get a floodplain development permit for an addition to a building

I realize that the church itself is in the floodplain

maps to reflect the new flood command zone that has been updated by Fema, and with that

Section J of the subdivision agreement speaks to the to stormwater conveyance, stormwater being conveyed in the historic manner.

given those are the two most critical threats this community faces with regards to climate resiliency

identified and defined wetlands floodplain which really constrained us in so many ways

the portion of the site where they're proposing to build the lots has also already been raised out of the floodplain

there could be some constraints because of the floodplain and things like that

the $300 million that that are backed up in terms of flood mitigation projects

I'm working a lot more on the green stormwater structure

Culturally, green stormwater infrastructure, low impact development.

on the flood plane I was trying trying to follow it through the document

the flood restrictions require non-residential buildings to be flood proofed and hotel rooms to be elevated above flood protection elevations

expand on the proposed dry flood proofing sign and it's compliance with FEMA and City requirements

The conveyance zone is the minimum space required to carry the volume of the 100 Year storm Event.

Key project goals align with the comprehensive flood and stormwater plan adopted by the city in 2022.

the city's stormwater and flood management. Utility uses a lifecycle approach to addressing flood risks throughout the community.

post the 2013 flood I recall how important it is to have permal soil to absorb rainfall

do we need to think about treating those areas any differently if they're or if they're near a flood conveyance Zone

then you have to walk instead of walking pretty directly to this to the Goose Creek path on as the connection is currently shown in the connections plan

it would make you go quite a ways out of the way it also I it seems like it's an odd um choice to if there is going to be a street

The site is also impacted by the 500 year Flood zone, which will require additional permitting at time of a future application.

A key part of the flood control. It does. Yeah, it's in a pipe right now, but it'll be daylighted.

we don't really look at the groundwater recharge we look at the surface water

the South Boulder Creek flood mitigation project is currently in the 90% design and permanent phase uh stage

the South Boulder Creek flood mitigation uh is included The Debt Service associated with this project is included in the operating budget

We can't necessarily question like overall building zoning maps and Fema's flood plains.

you know that you can't put a park bench because it's going to get washed away right in a major flood

Is that the flood plain? The way Boulder interprets these Draconian rules is making the urban condition horrible along the street front

currently sits within road right of way as well as within a flood plain, which is the driving factor for the relocation.

to remove from the current location within the 100 year flood zone.

It has to do with the flood zone and to I'm assuming it would be a good idea to bring electrical equipment out of the flood zone.

these are photos from the 2,013 flood where Boulder Creek had jumped its banks

So the bottom line for me, along with flood zone issues, trash, parking, etc, is, there needs to be a dialogue

and this pink area is referring to a high hazard flood zone. And then the blue which is most of our site.

there's certain stormwater costs for for a you know, we had a $500,000 cost at the hilltop.

Those improvements that they they piggyback on development work to make sure that the stormwater is ready, or this is right

connections to the city's wastewater utility and payment of standard stormwater plan investment fees

Going back to the Concept Plan Review, we looked at how we would fit stormwater features in around the perimeter of the site

This is our conceptual grading plan from the Annexation Review, and we drainage considerations were studied with respect to the available space

and then 6% for for Wastewater and 5% for storm water and flood for both years

with the exception of 2013 and the floods when there was a significant increase in water in storm water and flood water

the flood plain forces us to lift the home up approximately 3 feet because of the new flood plain

there are policies that say we need to deal with stormwater, and there are policies that say we need to have access

you need to put in a stormwater detention pond here

And then you're already having the library and working with the flood problems like it seems super unique.

It's very hard, because of the high hazard really, to work within the boundary of the floodplain.

And then, as we mentioned earlier stormwater and flood mitigation.

this effort does not identify the impacted flood plains and has not also identified wildlife and vegetation resources

Here you can see the site is impacted by floodplains and wetlands of Elmer's 2 Mile Creek

And for one, you're going to have more and more higher and higher stormwater and flooding

This project is currently forecasted to begin construction in 2026 and will include channel improvement and culvert widening at road crossings.

We do plan to bond in q, 1 of 2025 for our South Boulder Creek. Storm and flood project

I am kind of looking for a magic density number that doesn't put too much stress on our system with flooding

as well as storm water infrastructure impact of flood plane on the development

to cut flood mitigation, which is gonna happen more and more

our big move is increasing the flood capacity of the creek and doing some creek restoration here

We explore the ways that we are able to increase flood capacity on the site.

the solution is to develop a response plan and to plan to set up temporary barriers when we have a bad Flood

I'm here to talk about the uh Gregory flood uh mitigation project and I want to make three points

Had Fun's life in this storm green that represents the stormwater.

Upper Goose Creek. Flood and storm water projects. This is a combination of storm flood, channel improvements

the Gregory Canyon Creek Flood project, and we haven't talked a lot to the board about this

The drainage is very important. especially given the fact that it flooded. So I'm I'm fine with it.

filled with stones to capture the water and drain it to the East Side.

Grounding in a flood, they drive from being hit by debris.

When the big flood jumps goes down Canyon Water Street and breaches the berm.

that the worst problem with flooding is the built environment

we'll dive deeper into some of the major design projects that we're doing on Gregory Canyon Creek

Now, just a few full slides on the stormwater flood program.

we identified a new prioritization system for all of our flood projects.

we absolutely have heard that at the very least, screening is important for for neighbors who live immediately

we're working with utilities on looking at the flood plain. So this is a great example where the 3 different departments

we need to have a plan that talks about what we will do during the flood

a very simple Dam that was put up by a few people was able to seriously change the outcome of the flood

I'm here to speak about the Gregory Creek uh flood mitigation plan

the new storm system and the new box from a drainage standpoint.

I'm looking east again along balsam and kind of showing the flood improvements along balsam there

all those wild ideas about the flood channel, like going right through the property, and like elevated Paseo and all that

We've removed the call up for floodplain and wetland permits.

that a vast or about 40% of these applications that were brought as call ups were floodplain permits or wetland permits

This provided flood, mitigation and a multi-use path connection along Iris.

I would like this to also think about flood resiliency I mean there's a lot of different kinds of resiliency

Then the entire property is outside of the hundred-year flood plain.

so that floods could be mitigated better in that area, and so that there wouldn't be harm to humans downstream.

He arranged for the flood medication there and part of flood mitigation.

that will disrupt the alluvium in that area and flood people south of there.

And there's it's already flooded for the rest of the area.

we learned a lot from the 2,013 flood, and I think made the justification for that pipeline stronger.

But they're also flood in drainage way components of our what utility system.

Okay, start video. So in terms of the question about the floodplain that that you had

and, of course, the same floodplain restrictions that we were dealing with, and we wanted it to to be concordant

the current physical state of the home. As well as importantly, recent floodplain changes.

It wasn't just physics and shuttle skills that helped us navigate the flood. It was also the thoughtfulness and intention of the people who came before us.

to construct access operate and maintain elements of the South Boulder Creek flood mitigation project

elements of the South Boulder Creek flood mitigation project pursuant to the disposal procedures

these boundaries both upstream and downstream will change and be remapped as part of the South Boulder Creek flood mitigation projects

The site is located within the 500 year and 100 year flood zones.

much of the project site is affected by the regulatory flood plane of skunk Creek including the 100-year conveyance and high Hazard zones

I am interested always in Water waste water and storm water as it relates to this

either moving the house or bringing it up to code because it was in the flood plain.

it is located in the 2 flood plains. And the conveyance zone.

The blue area is buildable, but still lies within the 100 year flood floodplain.

I'm paying 4 million more by this not being a 500 year flood plain

The annexation is related to the construction of South Boulder Creek Flood project, and that's particularly spillway floodwall

A floodplain development permit application for the phase. Temporary construction fence plane required for demolition

How do we increase stormwater detention at at Pleasant View? We're looking at the ecosystems and again, stormwater detention at Violet.

looking to to slow and filter the stormwater through the site such that we're we wanna advance

16 drainageways South Boulder Creek has flooded historically uh through the city uh some of the major flood events were in 1938

the open space board is being asked to give away highly protected wetland Habitat to build a hundred million project for South Boulder Creek

Floodplain development permit application for the replacement of the Arapaho Avenue pedestrian Bridge over South Boulder Creek by the city of Boulder public works

because flooding affects all of boulder and see you going up there. If we don't do the flood remediation

those flood mitigation tools have effectively changed the entire character of the street Edge

this place did not flood due to um Upstream um improvements to the the bridge at um between Canyon and arapo on Broadway

The mitigation project itself will ultimately protect approximately 2,300 residents in this area 260 structures that are downstream.

As it enters into Boulder. As a natural system. South Boulder Creek has a history of flooding over time.

A brief overview of the South Boulder Creek flood mitigation project.

the built landscape whether it's Hardscape or whether it's built properties affects the flood plan and you know my water bill

this project is intended to protect life and safety by addressing flooding in areas known as the West Valley

was approved by City Council in December 2015 and was split in two phases

he's also our project manager for the South Boulder Creek flood mitigation project

I still certainly don't completely understand the wetland and floodplain process

Laura just quickly on that subject of the Wetland and floodplain callups. Does the Water Advisory Board have any role in that.

I know for sure that the floodplain permit was just approved exactly how it was originally presented.

There are instances where there is so much development and constraint that it's not even possible to get to 100 year level.

the Board took action on last year in the form of the Upward Use Creek and 2 Mile Canyon Creek flood, mitigation plan

This is a rendering of the South Boulder Creek Flood mitigation project that had design were performed in 2,023

And storm water with flood control. They, too, have asked questions about change.

My first question is about the flood. So you're moving the flood.

We've designed the street plan not about just about urban place making but also about the flood.

Much of the site is affected by the regulatory flood plane. Including the 100 year flood plane

that'll include flood improvements in a new Greenway along balam uh Road

Goose Creek channel improvements phase 2 junction to foothills.

First, is floodplain development. Permit Fld twenty-twenty-three 0 0 33,

what are the criteria by which we're supposed to be evaluating these flood plain development projects

we do have included in our scope um flood modeling throughout the process so we are working within our high Hazard Zone we take pretty seriously

one of my biggest questions is around sort of timing on flood mitigation and land use I noticed that we were talking about or in the packet

Mark can tell about Mile High flood District certainly um Mile High flood District uh actually uh as a most interesting assignment it uh as an organization they fund a great many um flood mitigation projects

if you could only do 50% lifetime. Renovation on your you know building in the floodplain

we are not allowed to add bike parking along this canyon side. Due to the high floodplain, the high hazard zone.

technically because of the floodplain, we're not, there, there's a couple of instances

It has to be elevated to the base flood elevation.

So what applies is FEMA regulatory map in this case for South Boulder Creek.

how do we protect neighborhoods at risk from floods and fires

she advocated for flood mitigation funding during the covid-19 pandemic

as an advocate for improved blood mitigation solutions for CU South

This is a picture of the non-conforming basement. So this shows the kind of the extent of the foundation that would have to be ripped out to meet floodplain regulations.

The flood considerations is again the entire site sits within the zone AZ.

how do you address the floodplain issues? Could it be added on to?

the many City Water Utilities that we have storm water flood

they have been able to make improvements infrastructure improvements around, flood control, for example

The next call is a flood plain development permit. For Mile Kane Creek at Nineteenth Street Channel improvements and a bridge.

We've got the floodplain kind of surrounding us on all sides.

The site is impacted by both wetlands and floodplains, so high hazard 100 year.

And the comment is due to the nature of the floodplain restrictions, the building is set back further from a rapo

they're required to meet all of our floodplain regulations and all of our wetland regulations

Basically re-graded and kind of elevated the building part of the site so that it's out of the floodplain.

there's also um for some of the uh underpasses a utilities function of flood conveyance

cleaning up trash and debris that's in the flood and drainage ways

we do still have to maintain the flood and drainage ways and um trash racks

You don't build on floodplain. That's what kills people, what hurts people, what causes long term expense

when I talk about C yourself, I'm also talking about the South Boulder Creek Flood mitigation project.

friendly towards see South being used for flood mitigation purposes that I wouldn't Advocate hard

recovery is a multi-year commitment for Boulder as the community builds back stronger and more resilient than before

the Front Range region received more than 18 inches of rain causing flooding loss of life and widespread damage

There's no water quality or stormwater detention. That will be improved significantly.

we're up 5 feet 11 inches just from the start of the building to get to that flood plain elevation

The site is impacted by the 100 year floodplain of the boulder slew, so the proposal is required to flood proof or elevate the lowest floor

fire flood pandemics and things like that of course we're making sort of a lot of speculation here um but the the benefit of joining this

There's insufficient right away. There's a lot of flood mitigation and flooding concerns.

I mean it. It is like high hazard floodplain. But in in integrating

was concerned about some of the buildings that could even be in some of the zones, because they're high hazard or 100 year floodplain

but I do wonder about that is in conveyance zone, and and just little splatterings of high hazard

happening with the mitigation techniques that are proposed for the Goose Creek and Canyon to Mile Creek

as opposed to just sort of the storm and flood purpose that it serves today

then what remains is discussion about the stormwater flood utility.

because of the flood storage component that most of our projects will not have an undeveloped area.

the South Boulder Creek Flood mitigation Project we're we're roughly a year and a half away from going to bid

the site is impacted by the 100 Year floodplain

we're also eager to be including strategies for climate ready Landscapes and flood resilient design

it's largely driven by the flood point. If it weren't for the flood plane

It does take a building out of the flood plane that is currently in the flood

we are bringing the site under modern flood protection

So these are the top right projects according to the framework and the quantitative and qualitative data that we discussed.

So we have completed a lot of mitigation planning across the city.

that project the South Boulder Creek flood mitigation project received the highest score of all projects evaluated

Next item is, call up, item, floodplain development. Permit fld 202-30-0004.

entire water management system, which is where Goose Creek would flow

There's a Creek Goose creek, and it's watershed are underneath that site.

protecting and the extent and permeability of urban soils in the city's Urban Tree canopy for flood mitigation purposes

I want to hear more about the RH flood issue too that would be helpful

significant flood zone you would be challenged to do either underground or have enough residential space

needing additional funding for storm drainage and flood mitigation as well as accommodating

if the flooded plane is 100 Year floodplain uh yes it would be impossible

the most of that area that's south of pearl Parkway is within that hundred year floodplain

not to put housing or actually anything in the 100 Year floodplain

a Greenway which is part of the recently accepted Goose Creek flood mitigation plan

improving and properly maintaining existing stormwater drains and systems is Paramount the plan is not acceptable

so I just want to highlight this as really what the need for flood mitigation is for these drainage ways

when we do flood mitigation we typically follow a life cycle approach as you can see here

Same goes for like stormwater detention facilities. Okay, Great. that that's all I have.

And then outlaw B would actually be the stormwater detention.

the risk in the floodway is not only to those folks living in the subway, particularly in culverts

one other factor to consider much of gosgrove is in the flood plain laying down more concrete and roof shingles means the next flood will be worse

Now that the flood plane is a number known quantity that wasn't well responded to

it will be one will be policy maker. You know the the policy leadership and flood influencers.

we need to be able to submit to the Federal agencies like basically showing that the the flood has been addressed

But I just wanted to point to page 153 in the packet for anybody who's interested in this flood mitigation easement issue

because they are keeping the building outside of our mapped flood plane

Much of the area of the of the development site is in the 100 year flood plane

We have the Goose Creek drainage, which is one of the 16 major drainage ways that comes right through the middle of it

and some of our upcoming projects, and it's a priority for the for the district

they also are a source of funding for us both in terms of maintenance and some of our flood mitigation projects

we just cannot have people sleeping in our flood ways we're heading into thunderstorm season and flash floods can happen

There's the flood risk. But there's also the taxes. The issue in our inner waterways

which is essentially having residential within the flood plane and not lifted above the base flood elevation

talk a bit about some of the flood constraints Number one, probably some of the constraints, number one being the flood and the flood plane

that outlaw is intended to accommodate future flood improvements and Broadway Street improvements

The project site is impacted by the 100 year flood plane, almost the entirety of the site.

Next one is call up of the floodplain development. Permit at 860

With the mitigation plan we will be able to remove around 500 or more structures from the flip plane

Preference was to convey hundred-year flows in the open channels. We considered roadway conveyance and of course, neighborhood impacts

even though there's a lot of constraint on the natural floodplains

the 2 things that you'll see linked in in the memo are that Upper Goose Creek, 2 Mile plan

Only showing you a little part of the stormwater drainage over all in this arc

the parking questions the TDM uh focus and um the underground parking and and floodplain

we also need to do Wildfire mitigation and flood prevention

So you know I've been involved in enough subdivisions throughout my career to know that you can't build in a flood plane.

how much of the structural damage that this did this building incur as a result of being in the flood plan.

but basically all of the lower level units were in water, and the 100 year. Flood plane elevations

we have got the approval on the Flood Master plan last year

A couple of flood Mitigation projects for this year include the South Boulder Creek and the Upper Goose and 2 Mile Canyon Creek projects

City Council approved the comprehensive Flood and Stormwater Master Plan. This plan is the guiding document

That's also a significant pinch point for the flood plane, so it's it. It would serve both the flood play and transportation objectives

from the flood plane standpoint, for example, that that we're exploring all the technical options that we have.

we're trying to really understand how we can integrate those into the part design process. We're also really lucky

overall litigation plan for the South Boulder Creek flood project so our staff

it's our South Boulder Creek flood mitigation project it's been an ongoing Council priority

getting, you know, the biggest pad area they could out of the floodplain that could be developable.

They'll have to go through the floodplain development permit process to build anything on the site.

So the fact that this site is in the 100 year and high hazard flood plane. I guess we adopted a new modeling software for this portion of boulder.

some improvements have been made to the creek such that that's like a once in the year, once a year.

But we certainly do know that we close that underpass during spring flooding.

Those have elevated stormwater management devices and community gardens at the upper level to help mitigate

The Water Resources Advisory Board could be consulted on Creek improvements, and any proposed flood mitigation

there are some floodplain permits that they would have to get especially for the subterranean parking

and how does that impact the A flood plane consideration

the standard wetland permit wet 2,022 culvert replacement at 50 First street and dry ditch

this area is like highly dictated by the flood plane

the overall proposal is significantly impacted by flood, plane, high hazard and conveyance zones from Boulder Creek

Are you guys constrained by on the floodplain by storage capacity?

It's one of the first ones to flood in spring.

what we're doing is applying for that city flood plane permit, and that's a major milestone for the project

without the Variance will incur significant additional cost to comply with floodplain Regulations only to have

the work to remove the property from the 100 Year Flood plan plane has already been completed

so bvsd will pay storm water plant investment fees they will comply with the city regulations regarding flood

as we take next steps regarding the flood mitigation it's a multi-year process and we are eager

we're eager to continue work on South Boulder Creek flood mitigation and commit to prioritizing life and safety issues

And then the the last item is a flood plane development. Permit fld, 2021 0 0 6. 3 in the 4,000 block of Nineteenth Street.

it's inadequate flood protection and why in God's name this small town needs a third campus

you saw the Flood Master Plan and heard about the how the racial Equity work was integrated into that plan

pvsd will pay storm water plant investment fees they will comply with City floodplain regulations

tonight on our comprehensive flood and stormwater master plan

that we prioritize funding that's going to make us safe from from the floods that we know will be coming

the best way to move water is to move it in the most natural way that it moved in the first place

instead he argued that the Havoc wrought by floods and other natural disasters may be better avoided

the flooding was due to the rerouting of water from the 2014 Pine View Park restoration project

there will be a vote on the 100-year flood mitigation plan and the agreement with CU this November

to allow any two or three story building to get a height modification if they have to raise their building because of a flood elevation

the continuing danger this leaves residents in is known and significant after years of hard work by the city

south boulder creek action group which has been advocating for flood mitigation for almost nine years since the 2013 floods

it will enable a portion of the land that lies outside the floodplain to become attainable housing

keeping people from residing and or taking up residence and camping in our drainage ways and and stormwater infrastructure

given the feasibility with the great changes the cost the railroad the floodplain

it's located within the hundred year flood plain and the ramping would extend beyond the sidewalk edges

recognized that this project is located in the floodplain and identified a design, which will cause no rise to the floodplain

policy r7 talks about kind of green infrastructure particularly around storm water

well my understanding of the floodplain is just an elevation that you know if you are below it you cannot build a basement

the floodplain which is all over boulder the 100 year floodplain there's thousands of homes in it

after some bigger floods we hired um outside um consultants and experts to to help us

again in california they require proof of mandatory fire or flood insurance upon sale

south boulder creek does have a history of flooding it's flooded three times significantly in the past

boulder is the number one flood risk in the state of colorado

tonight you will discuss a memo that states the south boulder creek flood mitigation project will be funded from the city's flood and storm water utility fee

equity in the flood and stormwater master plan update now i know that stormwater is not a real thriller

if there's been any attention put towards stormwater retention and infiltration um in the streetscape design

some of the things that we have planned for this year include an update to the stormwater and flood master plan

develop a comprehensive citywide plan for resiliency against disaster fire and flood

it is now obvious that the south boulder creek valley a lush riparian area should be used for 500 year flood control basins

the fact that cu's plans for the property also will make adequate protection against flooding

do you know what the flood protection elevation is compared to the existing floor elevation of the main level

there are flood issues uh one corner of the building is in the flood area so it would need to be modified

cu south and flood mitigation for south boulder creek is part of that that's ongoing

without more serious flood mitigation measures at the boulder creek is going to continue to happen in the future

this bike path that boulder creek bike path that runs underneath 30th street here regularly gets flooded

so this figure was was developed after the 2013 flood

the existing Dome is under um like a seasonal flood permit and they did not have to do any um indepth flood analysis

the site is impacted by the 100-year high Hazard Zone and conveyance Zone flood planes of Boulder Creek

as you know, with careful look at the floodplain issues

because they're on the floodplain

you're not going to do that by building a city at seems out on a floodplain

to address you all on the matter of the annexation of the South Boulder Creek flood plane

those of you who took a clear position of support on annexing CU South for flood mitigation

to more naturally prevent the kind of flooding that we had in 2013

mile high flood district has traditionally been represented by the mayor pro tem

they do also have some important uh stormwater and flood management projects planned for 2022

there is a fairly substantial bond anticipated for uh the stormwater and flood management utility

flood protection and so um the south boulder creek is really the only one where it's feasible

we do have warning systems and emergency plans in place in the city of boulder

as part of this project we have not allowed development in the floodplain on this property

it's the base or regulatory flood plain for FEMA and represents a 26 chance of flooding over the life of a of a 30-year mortgage

floodplain study which found that most of the Gravel Pit was in the floodplain as were hundreds of homes

we need to begin the floodplain permit process as soon as possible, given the

because of the existing floodplains in the corridor and places where we would think they would be most effective

to cross the creek to avoid another crossing and floodplain impacts

we have had experience with slots so anything that involves flooding

using the gravel mining ponds to catch the and store the flood waters instead of filling them in

I looked at the storm water master plan of June 2007 and this is really an excellent plan

this current annexation with an undefined annexation greenlighted when flood mitigation could proceed without doing the annexation

cu the flood mitigation and therefore this new south potential for annexation

only 30 percent of it would be um essentially allayed by the flood mitigations that we're planning

south boulder creek flood mitigation at cu south has two actions associated with it

if we're going to build a detention structure on south boulder creek to hold flood waters

to assess the resources we have for our flood and storm water maintenance work and we have some significant Staffing gaps

similar to some feedback we've gotten through our uh storm waterer and Flood Master Plan update where people have uh cited flood maintenance

one of our priorities in our work plan um is updating our comprehensive flood and stormwater master plan

we spend a lot of money on a regular basis on flood mitigation all across the city

the city's flood mitigation project that was accepted by council last july

the majority majority of this land is located in the high hazard and conveyance zones

we are concerned about flood risk and how those might be changing

floods are going to be localized you the whole city is going to end up underwater in a flood

I know there's been some concerns raised around how it interacts with the flood plane but uh in looking at the site review application

the last two categories around police oversight as well as CU South and South Boulder Creek flood mitigation with two key actions related to those

i'm here to um say some things about the south um boulder floodplain

Floods didn't it. Not as much as it could have, but it could rewrite it could have gotten their.

annexation terms or flood mitigation design will not be part of the purpose

100-year flood plane flood out Olive Boulder take out our 42inch Interceptor take out the sewer system

it is also aggravating to hear city the city and CU say that CU is donating this flood mitigation land to the city of Boulder

not letting our guard down being prepared for the flood or the which may affect water treatment

we were asked to develop um a project to meet the flood mitigation goals

this is a model of a flooding event and I'm going to stop it

we have the South Boulder Creek flood mitigation project Upstream alternative analysis update

the challenge that exists related to our flooded mitigation project on the site

um on the flood um piece of this you mentioned the goose creek master plan

it does successfully remove the pavilion building from the floodplain

say yes to more sensible proposals for Upstream mitigation that work better than what CU is currently offering

utilities is looking into environmental modifications under bridges that would modify ground services in a way that would meet floodplain regulations

having two parallel processes cu south annexation and south boulder creek flood control and keeping them coordinated

supporting the board's request for consideration of further analysis of the upstream option for flood control on south boulder creek

the next is related to south boulder creek flood mitigation and cu south with two key actions

regarding the South Boulder Creek flood mitigation project Upstream Alternatives analysis update

we don't need them threatening us about floodplain and all of this issue

including the all important issue of flood mitigation by far the greatest Community benefit in its direct positive and Lasting effect

flood mitigation in South Boulder Creek is a complex critical problem for many who live in South Boulder

annexation will allow flood mitigation at South Boulder Creek to move forward this is is an incredibly important project

the building is pushed as far south as possible to stay out of the wetland buffers and the floodplain

in our storm water and flood utility we've discussed in in some previous Council meetings the need to bring a city

it's really about storm water flood management and a big chunk of this utilities portion

i don't think we really got very much into the material around stormwater so i just want to put that out

flooding as a concern in our river systems and risks of more intense rains producing more intense runoffs

boulder is the number one flash flood risk in the state for life safety

Two years ago Council approved the very one 500 year South Boulder Creek flood mitigation plan

the purpose of the project is to actually detain floodwaters that are coming towards table Mesa drive

the exterior deconstruction is best done at the same time as the flood mitigation

floodplain maps are routinely updated to incorporate both advances in technology such as improved floodplain modeling methods

when you saw the previous presentation for south boulder creek you saw a range of what was the the current estimates between 66 and 96 million

we have the information session tomorrow night on CU South and South Boulder Creek flood mitigation

for the flood mitigation decision making we are going to hear that June I think 16th

what we need on the 16th is a decision on the CU on the South Boulder Creek um flood control project

CONTINUES ON ISSUES RELATED TO FLOOD MITIGATION PLAN WILL BE BROUGHT FOR OPEN SPACE

we're no longer uh demonstrating or showing the CU South South Boulder Creek flood issue that's now going to be on June 16th

THE COUNCIL PROCESS COMMITTEE ON CU SOUTH SOUTH BOULDER CREEK FLOOD MITIGATION

the process going to May the flood wall and Technical flood details and then annexation

there's the technical flood design so it's going to be we said 100 year

that recommended three phases of flood mitigation for South Boulder Creek

South Boulder Creek does have a history of flooding um there have been three major flooding events

you'll hear a lot of discussion tonight about the levy

because a significant portion of 19th Street resides in the Wunderland Creek floodplain

we didn't have a design that was fully compliant with the floodplain because of all that happened in 2013

I've been advocating for flood mitigation at South Boulder Creek since 2013

if we're protecting for the hundred year flood that's the volume that we're storing in the reservoir

as part of giving us property for the flood mitigation to develop our project on

your next item tonight is south Boulder Creek of flood mitigation

ENGINEERING THE FLOOD MITIGATION SOLUTION IS OCCURRING IN TWENTY TWENTY TO PREPARE FOR A CONDITIONAL LETTER OF MAP REVISION

THAT WILL SERVE AS FLOOD MITIGATION FOR THE CIDER WAS ALSO

ongoing involvement in the South Boulder Creek control project including possible disposal of OS MP land or construction of project features

we talked about the South Boulder Creek flood mitigation project and the CU South um annexation

we're already doing the South Boulder Creek flood mitigation project the comprehensive Financial

the flood mitigation project that we're talking about would basically protect those people and prevent that type of flooding

the flooding along the South Boulder Creek drainageway in 2015 city council accepted the South Boulder Creek flood mitigation plan

the CU South flood mitigation project is incredibly important to us I look forward to working with you

that's helpful to Creek flood mitigation project and there's partners that we don't have direct control of

I just want to call out you know the South Boulder Creek flood mitigation project that is gonna land in the next council

IMPROVE TRAFFIC AND PEDESTRIAN ACCESS AND CIRCULATION AND SLIDE MITIGATING STORMWATER MANAGEMENT.

CURRENTLY HAS NO STORMWATER DETENTION OR WATER QUALITY CONTROLS

THE SITE IS PRIMARILY IMPACTED BY THE ONE HUNDRED YEAR IN FIVE HUNDRED YEAR FLOODPLAIN

FOR THE PURPOSE OF PAYING THE PURCHASE PRICE FOR PROPERTY GENERALLY LOCATED AT

AND THE STORM WATER FLOOD MANAGEMENT UTILITY BY PROVIDING FUNDING FROM EACH ONE OF THOSE SEPARATE FUNDS

IT WILL BE DETERMINED IN A FUTURE UPDATE TO THE SOUTH BOULDER CREEK FLOOD

IT WAS DECIDED JUST TO HAVE THE FLOODWATERS MOVED OUT

THE REST OF THE BLOCKS FLOOD MITIGATION ALONG ON BALSAM

AND MITIGATION ACTIONS BY STORMWATER DISCHARGE PERMIT HOLDERS SUCH AS THE CITY OF BOULDER

there's been discussion about the South Boulder Creek flood mitigation project and some questions or discussion around the alternatives and specifically variant one invariant to

it's out of the floodplain has great views and is developable so I'll mention that our September working group meeting actually will take place at the airport

THESE STORMWATER PLAN INVESTMENT FEES THAT THE CITY WOULD CHARGE

UM FLOOD MITIGATION BEING ON THE SITE AND THAT YOU. IT MIGHT TURN OUT THAT ON THE NORTHEAST CORNER

I THINK THE FLOOD THE FLOOD MITIGATION THAT YOU PUT INTO PLACE MAKES SENSE TO ME ALONG THE NORTHERN SIDE.

WOULD LIKE TO HAVE THE CONNECTIONS THE FLOOD MITIGATION FOR THE TRIP. BEGINS TO FIX THE TRANSPORTATION

so the flood mitigation as described in our last meeting and this is the diagram that um is included in the plan

next page is the flood protection analysis where it shows on the West End where all the flood water is most likely to go

there's flood mitigation that's that's going on in that same location our engineer has worked with their engineers

without being able to do more at North Boulder Park it will mean that we have to address the 100-year flood on the site

another kind of key component that we're looking at in studying related to stormwater management and air quality

major issues to consider related to flooding and storm water management in East Boulder

WE LOOK AT FLOOD PLAIN REGULATIONS AND THE IMPLICATIONS TO. ANY OF THESE THAT ARE PLACED WITHIN THE FLOODPLAIN

WAS TO FLOOD WHICH WE GOT SOME REIMBURSEMENT FOR BUT NOT ALL

IN TWO DOZEN FIFTEEN OPEN SPACE MOUNTAIN PARKS PRIORITIZE THE REBUILDING OF INFRASTRUCTURE THAT WAS DAMAGED DURING THE DEVASTATING TWO THOUSAND AND THIRTEEN FLOODS

WE LOCATED ONE SITE THAT THEY'RE CURRENTLY USING FOR MITIGATING ALL OF THE IMPACTS

what we might be able to do in terms of flood mitigation in a more immediate time frame

the diversion of water from south boulder creek to the detention ponds

having more frequent floods yeah we will be having more frequent fires

seems things like flood recovery kind of things we will be

it was more of the stormwater that raised kind of more concerns with the engineers

there's more impervious surface there's storm water detention requirements that kick in through the subdivision

so that's an interesting point that you brought up how many people were here during the floods right

especially is we are going to have more floods we are going to have more climate instability

the plan for flood mitigation for South Boulder Creek got flushed down the

figure out how do we do neighborhood level mitigation including those downstream benefits

neighborhood level flood mitigation rather than mitigating the buildings for the construction of the buildings

we've been doing flood mitigation on Goose Creek since the 1980s so the 1980s to the early 2000s

WE ARE STILL GOING TO MAKE THIS BUILDING AS RESILIENT AS POSSIBLE PULLING ALL ENTRIES

THE PROPERTY IS IMPACTED BY THE HUNDRED YEAR FLOODPLAIN AND HIGH HAZARD ZONE OF BOULDER CREEK

BUT LET'S START WITH THE FACT THAT WE ARE STAYING OUT OF THE FLOODPLAIN

PLAN REVIEWS THAT STAFF HAD SOME ISSUES ON FLOOD ISSUES ARE VERY BIG DEAL

THAT WOULD BE COMPLETELY PROHIBITED IN TERMS OF COST BECAUSE THAT WOULD BE IN THE FLOODPLAIN AT THAT POINT IN TIME

AND IT TURNED OUT TO BE UNDER CAPACITY FOR POTENTIAL FLOODS

so we often get development proposal site reviews that include development in the hundred-year plane or we look at proposals and we're reassured

so the flooding experience there in 2013 would not be indicative what we'd expect in a 100-year floodplain

no it's in the floodplain and it's unusable was there severe flooding there during the 2011 event

THERE ARE CURRENTLY APPROXIMATELY THIRTY FIVE HUNDRED PEOPLE LIVING WITHIN THE SOUTH BOULDER CREEK ONE HUNDRED YEAR FLOODPLAIN

COUNCIL DISCUSSION AND GUIDANCE ON THE FLOOD NEGATION PROJECT NEXT STEPS

UPDATE ON THE SOUTH BOULDER CREEK FLOOD MITIGATION PROJECT

there's some ordinance we have that requires the longitudinal axis of the building to be oriented

the majority of the proposal is within the 100 and 500 year floodplains

request the council acknowledge the urgency of implementing south boulder creek flood mitigation commensurative with the protection

likewise they want to conduct a stormwater management study and so this would be

because it pulled so many additional people out of the floodplain that was a balancing act

regarding floodplains regarding flooding floodplains and groundwater in addition to prioritizing floodplain preservation

YOU COULD GET A FLOODPLAIN DEVELOPMENT PERMIT TO BUILD A FENCE IN THE FLOODPLAIN

SO JUST A QUICK NOTE ON FLOOD LIKE MUCH OF THE CITY THIS PROPERTY IS LOCATED IN THE HUNDRED YEAR FLOODPLAIN.

PRIORITIZE THE REBUILDING OF INFRASTRUCTURE THAT WAS DAMAGED DURING THE DEVASTATING TWO THOUSAND AND THIRTEEN FLOODS

I imagine I don't know but I imagine we would mitigate that to help contain or process those flood flood waters through there

the existing stormwater system from Broadway down does not have the capacity to accept the flows our mitigation plan is looking at

right now we have a we're working on a flood mitigation study and so we've looked at several

taking that taking away the uh flood recovery uh priority which continues to be big priority for the county and Longmont

IN SUPPORT OF THE MILL LEVY INCREASE FOR THE URBAN DRAINAGE AND FLOOD CONTROL DISTRICT

the floodplains won't increase on the site due to the flood mitigation infrastructure or removal of the levee system

the South Boulder Creek mitigation study that was adopted in 2015 looked at two potential opportunities in this area

development in the hundred year flood plain for residential it requires that the lowest finished floor be elevated

THE INITIAL MODEL RUNS INDICATE THAT BECAUSE WE'RE PREVENTING OVER TOPPING OF US THIRTY SIX

MEANING THAT AN ESTIMATED THREE THOUSAND FIVE HUNDRED PEOPLE WOULD NO LONGER BE WITHIN ONE HUNDRED YEAR FLOODPLAIN

THE STAFF CHECK AND FOLLOW UP TO THE AUGUST TWENTY FIRST COUNCIL DECISION ON A SOUTH BOULDER CREEK FLOOD MITIGATION CONCEPTS

I'll also add the FEMA flood insurance is pretty limited so it is generally based on the premise that a basement

I was just wondering regarding the flood insurance policies if it had anything to do with the amount of building that is allowed in major drainage ways

we have a backlog of about a hundred and seventy million dollars worth of flood mitigation projects

FUTURE HOME REPLACEMENTS WITHIN THE HUNDRED YEAR FLOODPLAIN WOULD BE REQUIRED TO BE ELEVATED

IT WOULD BE HIGHER THAN THE HUNDRED YEAR FLOOD PLAIN IS THAT CORRECT

THE REQUIREMENTS IN ELEVATION ABOVE THE HUNDRED YEAR FLOODPLAIN SO WE WERE ABLE TO FIND OUT

SOUTH BOULDER CREEK FLOOD MITIGATION ON THE SOUTH BOULDER CREEK.

THIS IS ONE OF THE HIGHEST QUALITY HABITATS THAT WE HAVE THE SULPHUR CREEK FLOODPLAIN.

INCREASING THE TOTAL PROJECT FLOOD WATER STORAGE VOLUME. COULD ALLOW THE PROJECT TO PREVENT OR TOPPING OF US THIRTY SIX

THOSE SLIDE SHOWS THE OVERALL PROJECT TIMELINE FOR THE SOUTH BOULDER CREEK FLOOD MITIGATION PROJECT.

SOUTH BOULDER CREEK ACTUALLY DOESN'T HAVE A WHOLE LOT OF CAPACITY IN THE CHANNEL ITSELF AND DURING LARGE STORM EVENTS IT OVER TOPS.

PRIORITIZE AND EXPEDITE FLOOD MITIGATION FOR OUR DOWNSTREAM NEIGHBORS.

A SITE REVIEW WOULD BE LOOKING AT THAT ANALYSIS TO ENSURE WE HAD A PROJECT THAT COULD MEET THE FLOODPLAIN REGULATIONS.

IT REQUIRES A TWO FOR THE TWO FEET OF FILL SO THAT YOU'RE ABOVE THE BASELINE

ALL STRUCTURES WITHIN THE FLOODPLAIN REQUIRE A FLOODPLAIN DEVELOPMENT PERMIT.

ACQUISITION OFFERS AN OPPORTUNITY TO OBSERVE AND MANAGE THIS IMPORTANT DRAINAGE AND POTENTIALLY MEET MITIGATE FUTURE FLOOD IMPACTS

WHO OSTENSIBLY HAD AN EVACUATION PLAN FOR THEIR FLOODING BUT THEY ARE HERE TO TALK ABOUT THE FLOODING

I WOULD LIKE TO CUT UP AND TO SEE A LITTLE MORE DETAIL ABOUT THE FLOODPLAIN

MANY EXPERIENCED THE FLOOD FIVE YEARS AGO WHICH THEY LOST CARS AND BELONGINGS AS SHOWN IN A FILM

MITIGATING SOME FIRE AND FLOOD RISK SITS THERE LIKE THEY'RE TWO SIDES OF THE SAME COIN

UP ABOVE IN THE ECOSYSTEM HEALTH IS PROTECTING WETLANDS PRESERVE IN FLOOD PLAINS

envisioned for regional flood detention and the boundaries of this were based on the South Boulder Creek master plan phase 1 concept

the city then initiated a flood mitigation master plan for South Boulder Creek in early 2010

the project manager for the South Boulder Creek flood mitigation project

THROUGH THE PLANNING AND IMPLEMENTATION PHASES OF THE SOUTH BOULDER CREEK MITIGATION PROJECT

THE CITY HAS BEEN STUDYING THE SOUTH BOULDER CREEK FLOOD MITIGATION FOR OVER TWO DECADES

I READ THE MEMO CORRECTLY YOU CAN HAVE TO GET A FLOOD PLAIN PERMIT

we saw that with the 2013 flood but another component of this budget flexibility relates to how proactive are we

the most recent example or the one that's most prominent is the flood right we had 28 million dollars in damage

not only several years ago did they raise a quarter of a million dollars for jamestown flood recovery efforts that was collected from cyclists

it's part of what the mitigation study will look at that will be handled also as a part of the area planning process

some flood mitigation would be considered in Northville to park I guess I was under the impression that it already is a detention pond

there is current flood mitigation planning happening on upper Goose Creek looking at a range of things

back in 2013 we had some devastating floods as well

we had funding slated for this year for the design we've been working through the process

construction of significant improvements at Wunderland Creek which will decrease risks to almost 600 homes which are located in the 100-year floodplain

the Goose Creek repair between 19th and Folsom and the part of Goose Creek is concrete banks

I'll just start based on some conversations we've had on the South Boulder Creek flood control project

you don't have to do those stormwater recovery projects with masonry and local stone

significant improvements at Wunderland Creek which will decrease risks to almost 600 homes