FLOOD02900

• County: Adams
• Community: Commerce City
• Basin: South Platte
• Title: Lower First Creek and Direct Flow Area 0055 Major Drainageway Planning
• Date: 5/1/2002
• Prepared For: UDFDC
• Prepared By: Turner Collie & Braden Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

AGENDA

TumerCellie0Braden Ine.

MEETING MINUTES

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First Creek asp and FHAD
(Progress Meeting)
Time: 2:00
Date: January 19,2000
Location: Urban Drainage & Flood Control District

Subject:
Job No.:

Lower First Creek and Direct Flow Area 0055 Outfall Study
35-05096-040

Place: Urban Drainage and Flood Control District Offices
Date & Time: 1/19/002:00 PM

Attendees:

David Mallory (UDFCD) Bill DeGroot (UDFCD)
Edward Stafford (Commerce City) Rick Moser (TCB)
David Center (TCB) Daren Duncan (Adams County)
Tim Kilgannon (RMA) Jim Pearce (RMA)
Rich Ommert (TCB) Tom Acre (Commerce City Parks)
Chris Gervaus (Commerce City) John Akolt (FRlCO)
John Hamilton (Muller Engineering) Stephen Smith (R VO-RtVfA-USFWS)
Jim Jones (South Adams County Water & Sanitation)

(1)

First Creek Aligrunent Adjacent to South Platte River

(2)

Full Conveyance Alternative
Typical Channel Cross Section

(3)

Offline/Online Detention Alternative

Pre parer:

David Center

Date: 1/20/00

(4)

O'Brian Issues

The purpose of the meeting was to report on progress on the Outfall Planning and Flood Hazard Area
Delineation Study for the lower First Creek watershed.

(5)

Other Issues

(6)

Next Meeting/Adjournment

Alternative Formulation
Dave C. described the alignment through the LaFargelDenver Water Site. This alignment differs from that
sbown in the previous study in which First Creek flowed to the north. Channel sizing in this reach will bc
dependent on the reclamation plan for the current LaFarge operations. The future use of the mining pits in
this area is for water storage for Denver Water.

Dave C. presented a Full Conveyance Alternative, which conveyed the 100-year event from 96'h Ave. to
the South Platte River. lnfonnation for this alternative included approximate channel sizes and roadway
crossing sizes. A typical open space channel section consists ofa 2-year low flow channel with 3:1 side
slopes and a 100-year bench section with 4: I side slopes.

Rich explained various scenarios for online and offline detention alternatives. Three sites have been
identified as potential locations for detention. The first is 96'h Ave. Detention, which is located just
downstream of 96'h Ave. The second location is the existing Maul Reservoir, which could be enlarged to
provide detention on both sides of Peoria SI.. The third location would be at the proposed straightened
O'Brian Canal. This will remove the horseshoe from the existing canal and provide detention between
the new berm and Highway-2. These basins can be operated in various ways to meet different
requirements such as flood control and water quality. The alternative will be further evaluated.

O'Brian Canal Issues
Muller Engineering has completed a feasibility study on abandoning the Little Burlington Ditch from 90'h
Ave to 104'h Ave. Flows 1V0uld be diverted from the Little Burlington Ditch to the O'Brian Canal at 90'h
Ave. and then back into the Little Burlington Ditch at 104'h Ave. To make this feasible the O'Brian Canal