FLOOD05178

• County: Jefferson
• Community: Lakewood
• Stream Name: Weaver Creek
• Basin: South Platte
• Title: CLOMR Report for Preserve at Weaver Creek HEC-2 Cross Sections 24+30 to 42+95
• Date: 12/26/2000
• Prepared For: Fairfield Homes
• Prepared By: David Evans & Associates
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Preserve at Weaver Creek
CLOMR Report

December 26, 2000

I. INTRODUCTION

This report was prepared in order to request a Conditional Letter of Map Revision (CLOMR). The
report summarizes the data necessary to complete the request, and includes the forms, drawings and
data in the appendices.

A. Site Description

The site is located in a portion of the southeast quarter of Section 33, Township 4 South,
Range 69 West of the 6th Principal Meridian, Jefferson County, State of Colorado. The
property is currently in unincorporated Jefferson County and is in the process of being
annexed to the City of Lakewood. It is located northwest of the intersection of Hampden
Avenue (SH 285) and Kipling Parkway, and consists of approximately 14.36 acres ofland.
The topography of the site slopes towards Weaver Creek, which is the main drainage feature
on the site. Weaver Creek runs from the south to the north across the middle of the site and
has a constant base flow. There is a 7 foot by 7 foot concrete box culvert under SH 285 and
the frontage road, that allows Weaver Creek to enter the site. During the 1 DO-year storm the
creek overtops the road as shown on the FIRM in the Appendix. There is a concrete
channel at the outlet of the culvert that extends for approximately 140 feet downstream.

B. Proposed Proiect Description

The proposed development on this land is comprised of condominiums with 164 residential
units and the required streets, utilities and parking to accommodate the condominiums. The
condos will be built on both the east and west sides of Weaver Creek, and will require fill
that extends into the existing I DO-year floodplain delineation. There will be a pedestrian
path that crosses the creek towards the middle of the site to link both sides of the
development. This crossing will have culverts under it that will allow the base flow of
Weaver Creek to pass without overtopping the path. During the I DO-year event the path
will be covered with three to four feet of water. There will be walls constructed on both
sides of Weaver Creek to keep the condos out of the revised I DO-year floodplain with at
least a foot of freeboard.

C. Flood Hazard Area Delineation

The Flood Hazard Area Delineation, Weaver Creek, May 1981 pertains to this site. The
general hydrology and hydraulics ofthe basin are contained in this report. The report also
lists the runoff expected for different recurrent storm events. The flood plain for Weaver
Creek on this site is shown by the FIRM for Jefferson County, Community Panel Number
080087 0290B as shown in the Appendix.

David Evans and Associates. Inc.

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