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

TurnerColIiec9Braden Inc.

First Creek OSP and FRAn
(Progress Meeting)
Time: 1:30 PM
Date: July 3, 2001
Location: Urban Drainage & Flood Control District

Engineers. Planners. Project l\ttanagers

MEETING l\HNUTES

Project:

First CreekIDF A 0055 FHAD and OSP

Project Number:

35-05096-040

(1) Introduction

Meeting Purpose:

Project Status and Progress Meeting

Meeting Place:
Date & Time:

Urban Drainage and Flood Control District
July 3,2001,1:30 p.m.

(2) Comments from June 27'" meeting

Attendees:

UDFCD: Bill DeGroot, David Mallory
TC&B: Alan Potok, Tim Masters, Charles Carroll

(3) Flood Hazard Area Delineation

Minutes by:

Alan Potok

Date prepared: July 3, 2001

(4) Outfall Systems Plan
a. Eagle Creek
b. CAST Site
c. Detention Basins
d. Maul Reservoir

The following items were discussed:

Flood Hazard Area Delineation
Alan suggested an understanding of the purpose of the report as being to (1) provide sufficient
technical documentation to support a LOMR on First Creek and selected tributaries and (2)
provide the community with a set of working drawings that depict flood hazard under existing
conditions and also future development conditions assuming no new flood control improvements
are in place.

(5) Progress Meetings

The study streams include First Creek, Rolla, Elm, Birch, Arsenal, and Union Pacific tributaries.

(6) Next Meeting! Adjournment

Bill requested that the FUTURE model conditions be submitted first to allow the District to
determine whether or not they will want to focus on the EXISTING model.

For determination of the floodway, Bill stated that we should assume no flow split, that is, a
downstream discharge of9,OOO cfs (or what is specifically recommended from the model).

UCDFD provided an example of a FHAD (Box Elder Creek) to follow. It is important that the
exhibits show a stream orientation.

The 10-year and 100-year events will be shown on the water surface profiles. All storms shall be
listed in the tables.

Profile exhibits need to show all existing bridge crossings.

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