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

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AGENDA

TumerCeIlie<fJBraden loe.

MEETING MINUTES

First Creek OSP and FlLill
(progress Meeting)
Timc: 2:00
Datc: Dccember 15, 1999
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: 12/15/992:00 PM

(I) Study Schedule
(2) Wetland Inventory (ERG)
(3) Full Conveyance Altcrnative
(4) Peoria/SH 2 Detention Basin Alternatives
(5) 'Typical Channel Cross Sections
(6) Hydrology Report Status
(7) Other Issues
(8) Next Meeting/Adjournment

Attendees:

David Mallory (UDFCD)
Edward Stafford (Commerce City)
David Center (TCB)
Tim Kilgannon (RMA)
Rich Ommert (TCB)
Denise Larson (ERO)

Bill DeGroot (UDFCD)
Rick Moser (TCB)
Daren Duncan (Adams County)
Jim Pearce (RlvlA)
Pete Jessen (Mile High Development)

Preparer:

David Center

Date: 12/16/99

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.

Schedule
Rick Moser discussed the schedule as it relates to the completion of the hydrology phase and the start of
the alternative phase. Submittal of the Final Hydrology report is a little behind schedule. However, it
should' be finalized prior to the next progress meeting. The alternative phase is still on-schedule.

Wetland Invcntory
Denise discussed the process by which ERO will conduct the wetlands inventory. Aerial photos and field
investigations will be used to inventory wetlands. The inventory will not be a regulatory delineation.
Instead, it will provide approximate wetland locations. The inventory will include all wetlands within the
study area and some limited to identification of wetland plants. The RVO will provide wetland
delineation's to ERO (of the Rocky Mountain Arscnal) for inclusion in their inventory. All infonnation
will be reported on the 2-foot mapping provided by Adams County. The wetland inventory will begin in
January 2000.

Full Conveyance Alternative
TCB presented a 100-yr full conveyancc option for routing First Creek through the study area. The
mainstem was conveyed in a two.stage channel. The 5-yr flow was conveyed in the low flow section and
all larger flows were conveyed in the "bench section". Tributaries were conveyed in a trapezoidal
channel with a concrete lined trickle channel. Channel alignment followed that proposed in the WWE
study. Bill requested that future alignments should include the option of an alignment through the
LaFarge gravel pits to the South Platte River. A typical channel cross section was prcscnted which had a
maximum depth of 10-feet. Bill requested that future alternatives should not include benns for
channelization of flows. Additionally it was requested that concrete lined trickle channels not be used
and that a wetland cbannel design be used instead. This alternative will be completed and used for
comparison of future alternatives.

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