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AGENDA TumerColIie@'Braden Inc. MEETING MINUTES First Creek OSP and FlLill (progress Meeting) Time: 2:00 Date: February 29, 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: 2/29/002:00 PM (I) DFA 55 Tributaries (Existing Alignments) Attendees: Bill DeGroot (UDFCD) Stephen Smith (RVO-RJ\1A-USFWS) Edward Stafford (Commerce City) Rick Moser (TCB) David Center (TCB) Tim Kilgannon (RMA.) Jim Pearce (RMA) Rich Ommert (TeB) Wes Gardner (Gardner/Kushnriff Real Estate) (2) Alternatives Feedback Preparer: Da v id Center Date: 2/29/00 (3) Detention VIS of Hwy-2 The purpose of the meeting was to report on progress on the Outfall Planning and Flood Hazard Area Delineation Study for tbe lower First Creek Watershed. (4) FHAD (5) Other Issues DFA 0055 Tributaries (Existing Alignments) Dave described the existing alignments for the Elm, Birch and Arsenal North drainageways. The Elm drainage stops at the O'Brian Canal where it is retained on-site. The Elm is proposed (by engineers for the Mountain View Industrial Park) to drain to the proposed Arsenal North Drainageway, which follows along Havana 51. to First Creek. (6) Next Meetingl Adjournment At the direction of the sponsors, the Elm alignment will be shown going through the O'Brian Canal and Burlington Ditch and meeting with the Birch Drainageway. The Arsenal North will flow through the O'Brian and Burlington and confluence with the Elm Drainageway. It must be noted that the current constructed Elm channel is insufficient to convey the 100-yr future land use runoff from the Elm and Arsenal North Drainageways. Additionally, increases to the Birch channel cross section would be required downstream ofthe confluence with the Elm. If the channels on the Elm and Birch are not upsized a residual floodplain would exist along those drainageways. The alignment along First Creek can be changed from the Burlington Ditch to the Belle Creek development. The new alignments will try to keep the channel within the designated floodplain. Detention Upstream of SH-2 At the request of UDFCD TCB investigated the use of two detention basins upstream of SH-2. One 350 ac-ft basin at 961h Ave. would reduce the base model two to ten-year peak flows to existing model conditions. The second basin would reduce the 1 OO-year peak flow to approximately 31 OO-cfs. This would require approximately 500 ac-ft of storage. The location for this storage could be at the proposed relocated O'Brian Canal, SH-2, or an enlarged Maul Reservoir. I I I I I I I I I I I I I I I I I I I