Also, I have a meeting Thursday at 4 with someone. Idk who. If it's you, please let me know where we're supposed to be meeting.
Never thought I'd say this, but after covering presidential campaigns for a national outlet this weekend, I'm so glad to be back doing the local thing.
Joe Taddeucci, Utilities Director
Brandon Coleman, Utilities Engineering Project Manager
Phil Kleisler, Senior Planner
At CU South, that's CU, Open Space, CDOT, and Dry Creek Ditch Co.
South Boulder Creek is 27 miles long; watershed is 5 square miles. SBC discharges into Boulder Creek east of town.
3,500 people
1,600 dwelling units
660 structures
U.S. 36 overtopped in 1969 and 2013
2013 damage: $38M
2013 flood: between 50-100 year event
From the meeting memo: “This study quantified and formally recognized the risk from overtopping of US36 during a large flood event."
Floodplain = area we expect water to cover during a flood event
100-yr floodplain = 1 in 100 chance of flooding in any given year, base regulatory floodplain for FEMA
High-hazard = based on velocity and depth of water; it has the ability to sweep someone off their feet, Coleman says
Approx 25% of buildings in Boulder are in the 100-yr floodplain
Just to give you an idea of how long these things take.
City council on Aug. 4, 2015 adopted South Boulder Creek Master Plan
Step 2: detention at/near Manhattan Middle School (which will now go at Hogan-Pancost) and Foothills/Baseline along with improvements to Dry Creek No. 2 Ditch
Step 3: Stormwater detention at Flatirons Golf Course
CU bought land in 1996 from Flatiron Companies
Land use changes initiated in two-year process; completed in 2017
100-yr
200-yr (ish)
500-yr
Reminder: 500-yr is what council picked initially
Coleman talking about why.
It's not clear that can be accomplished with the 500-yr design.
Additional analysis is needed
Which will be easier, bc council, OSBT have to sign off on disposal. And residents can trigger an election on disposal with a petition.
"In order to get CDOT approval on this project, we need to keep the flow conditions under the bridge to existing conditions. We can't make it any worse."
Tadduecci: "I couldn't guarantee we could get that through the permitting process. ... It may not be worth bringing that one forward."
Coleman: It's easier, we're getting closer. But we still haven't been able to get those to match.
Taddeucci: Typically it takes 2-3 yrs for a project of this size to get permits from all the agencies. We're having some conversations with some of them.
Tadduecci says that is correct.
Taddeucci: Idk that I'd say which are the most difficult. They may be listening.
Taddeucci: Yes.
Carr: Yes. Their decision is advisory.
Taddeucci: The Carter Lake pipeline crossed "a number of" open space properties. We got a disposal; it comes up "quite frequently."
The shorter the flood wall, the fewer impacts, bc the area with the most sensitive habitat is where the wall *could* extend with a 500-yr design but not in the 100-yr.
Taddeucci: If the wall ended 200 ft further to the west, the 200ft by 90ft in width, that could be left undisturbed.
Brockett: So substantial?
Taddeucci: It could potentially be.
100-yr design Environmental impacts: 7.4 acres of wetlands (4.8) and open water (2.6) and 0.9 acres of threatened and endangered species habitat
500-yr Environmental Impacts: 9.7 acres of wetlands (7.1) and open water (2.6) and 5 acres of habitat
Is the 200- or 500-yr likely permit-able Friend asks?
Coleman: It would be more challenging.
Carr: It just technically takes it out from being open space land. It's city land; it will still be city land. It just transfers maintenance.
Taddeucci: I don't remember, but it was several properties. Open space did a disposal for an easement.
Dan Burke, director of OSMP: One clarification, OSBT has to approve the disposal, not just recommend.
Burke: There are 2 paragraphs on how disposals should work. Doesn't lay out criteria or ratios.
"We still felt this was the best concept moving forward," he said.
(Bc larger storms may become more common, is the context there.)
Burke: 30 ft is estimated to be permanent impact.
Yes, staff says.
"Shortening something by 200 ft that's half a mile long to begin with doesn't seem like it would have this much less of an impact. Is this all about the Preble's mouse?"
AND WE HAVE OUR FIRST 'I'M NOT A HYDROLOGIST' STATEMENT OF THE NIGHT! Hit your bingo cards.
Coleman: Just from a stormwater component, when you develop, you're required to maintain existing runoff from a site. We haven't considered that bc we're not doing site design or layout.
Wells throughout the site will monitor that, Coleman says.
Kleisler: We have that but didn't share it yet.
Coleman: It limited flooding on the site itself but didn't impact downstream negatively.
Coleman: It doesn't affect the design whether it's there or not.
Friend: What's the cost differential for removing it or not?
He's going over the process. It's boring so far. Basically they planted some flowers.
"I just wanted that context" of how difficult it can be with this species, Weaver says.
D'Amico: We tried our best. We replicated the soils, etc. "If any transplant process would have been successful, we feel this would have done it."
But "we could try again."
D'Amico: We find them all up and down South Boulder Creek.
D'Amico: Fish and wildlife requires that we not do construction when they're hibernating. So they (the mice) could potentially leave.
Weaver going over the difference in detention for 100-yr vs. 500-yr: We'll detain something like 2/3 of the water in a 500-yr storm with a 100-yr detention design.
Put another way, they could be 30% lower or 50% higher.
We've been off by 20% and 50% in the bidding process before, Sullivan says.
Sullivan: That's entirely possible. We also have to account for the rise in labor and construction costs by the time we actually build this thing.
Sullivan: Current stormwater rate is $17/mo on average.
Taddeucci: We can do either.
$30/mo for wastewater
$17/mo for stormwater
Brockett reminding ppl that just the stormwater portion would go up by 50-70%, not the entire water bill.
If levee stays in place, there will be tradeoffs. We haven't evaluated that at this point.
Taddeucci: It potentially could be. But it's a legal question of what utilities pays for.
Coleman: We've assumed all the fill needs to be imported to the site. Levee has 60,000 cubic yards; we'd need upward of 1.3M cubic yards for the 500-yr design.
Transportation vs. fill itself costs are broken out in the packet, he says.
Friend starts: 200- and 500-yr aren't feasible.
100-yr looks permit-able, provides benefits, is cost effective.
"It's probably worth having some $$" leftover to address the others as well after this one.
18 months after selecting the flood mitigation design, council will go with another design that was also an option 18 months ago.
Much new info gained over that time, of course.
CU's goals: 129 acres of buildable land, to be from OSO or paid for at fair market value what is lost
Jan. 21, submitted amendment that housing may not be “suitable and feasible” boulderbeat.news/2020/01/26/cu-…
We'll touch on that later, Kleisler says. Things have changed.
CU South is the largest parcel of land (308 acres) currently available for annexation and (some) development.
Kleisler: The uni has more comments on that that they'll be getting into.
In that area, owned by the city:
30 acres purchased by housing division
190 acres purchased with parks funds, I believe.
Yates: Yeah, you're not. (laughs)
Taddeucci: Yes.
Yes, Taddeucci says.
Kleisler addressing: Council could choose to extend the current mid-term update to accommodate that, but it would hold up everything else in that update.
The last time that happened, it took a couple years, Kleisler says. "I don't think that's an option to move expeditiously."
Kleisler: That definitely throws some more bubbles into the Venn diagram. I don't see where it makes it easier.
Kleisler: There are a lot of prairie dogs.
Yes, Kleisler says.
Haley: Yes, there would probably be reimbursement of some kind, bc it was paid for with sales tax/bonding for parks land.
If those needs could be ID'd and met at the CU property, that could be made whole.
Yes, Haley says. The intention in the 90s when we bout this was more to have a "large expansive" area.
Yates: And we have higher priorities if we had the $$, right?
Yes, Haley says. It's not in our investment strategy, capital improvement plan, etc.
Second was mostly direct but also some paraphrase so we'll call it a paraphrase.
Less than 50% of CU's total 308 acres.
And will it consider a land swap?
"We just cannot recommend this course of action."
And these are all related to designs city isn't going to do (200- and 500-yr) so it doesn't matter (to me)
restoration opportunities and pay more for fill – or – maintain the levee and drop the costs significantly
If the city selects 100-year, no additional fill will be required."
Yes, CU says.
Not yet; we want OK from the city first, Draper says.
You committed to provide housing; you amended that and "made housing a very iffy proposition." Now it's back on the table with "a new ask."
Draper: We were, too.
But the access point to the west, could we maybe do emergency access or bike/ped, to be kind to the adjacent neighborhood?
Lakewood pipeline took 16 years to get approval; millions of $$ in analysis. Carter Lake pipeline; we started in 2003 and it's just getting constructed now.
Silva: The annexation application is our statement on the matter.
"I would say there's as much switching on the city's side as on CU's side."
No, Draper says. We have stated that and been firm. The land needs to stay as one package deal.
Wallach: I understand. I'm asking why that is.
Wallach: So you're just holding it for leverage.
Draper: As are you.
They did not acquiesce.
No efforts have been made at Area III but Valmont has been developed, right? Weaver asks.
Yes, Haley says.
Haley: It's the same classification. Valmont is more centrally located and the schedule for development was earlier; it's closer to the city's core.
Haley: 700 city and regional parks acreage; 274 of those acres are developed. 7.3 acres per 1,000 population
Why are we looking at this? What are we getting for Boulder? Idk why we're even talking about this.
Plus, there has been displacement! Just bc ppl voluntarily left doesn't mean it doesn't count. They have so few options.
Kleisler: We looked more as a performance-based standard: height limit, etc.
I feel we are talking past each other. We've been doing that all night.
Funny, during his campaign he said he didn't think CU should have even agreed to the city's height limit, that they could build to 20 stories there and he wouldn't care.
Strikes me as interesting in a discussion where we're talking about another kind of protection: From flood.
"I'm really interested in keeping options open."
By car.
Kleisler: We were thinking flood mitigation buttoned up by the summer; 3 months then for a transportation analysis, open space, etc. ... I would say at least 6 months to a year.
References Tipton report.
Weaver: I agree.
That's a wrap on this. @threadreaderapp please unroll. Thank you!