FLOOD09722

• County: Boulder
• Community: Boulder
• Stream Name: Boulder Creek
• Basin: South Platte
• Title: Request for LOMR - City of Boulder
• Date: 1/1/1989
• Prepared For: Boulder County
• Prepared By: Love & Associates, Inc.
• Floodplain - Doc Type: Historic FEMA Regulatory Floodplain Information

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both the UD&FCD and FEMA on August 15, 1988 in conjunction
with the preparation by the Engineer of a conditional letter
of map revision (Ref, 3). The CLOMR was accepted by FEMA on
October 28, 1988, The hydraulic analysis for this report was
prepared with detailed consideration of the existing FRAD to
insure consistency,

construction documents for the drainage, grading and wetland
improvement project were prepared by the Engineer for the
UCBRP (Ref. 2), Relevant portions of these documents were
used to aid in the preparation of this study completed by the
Engineer in January, 1989 and are included as a part of this
submittal.

2,0 ARF.A STUDIED

2.1 ScapI' af Study

This flood study covers the UCBRP in Boulder, Colorado, The
study area is shown on the location map, Figure 1,

The analysis of Boulder Creek consists primarily of the right
overbank area and extends from northeast of the Arapahoe
Avenue and Foothills Parkway intersection upstream, to just
past Potts track and field stadium on the UCBRP site (Fig,
Sa) ,

2.2 Cornmunitv Description

The UCBRP is state owned land completely surrounded by the
City of Boulder, located northwest of Denver on the east side
of the Rocky Mountains in Colorado, The City, with a
population of approximately 84,000 people, encompasses 19.5
square miles located on an alluvial plane extending from the
base of the Front Range eastward,

Current and future development of the UCBRP have resulted in
the need to re-direct floodwaters which flow through the
site, portions of which are located in the historic Skunk
Creek, Bear Canyon Creek, and Boulder Creek floodplains,

2,3 PrinciDal Flood Problems

The Boulder Creek channel has several potential flooding
problems arising from spatially varied flows as floodwaters
repeatedly leave and return to the main channel, Storm
waters from Boulder Creek will overtop the right bank
(looking downstream) along the study reach during a 100 Year
flood, flowing eastward across the UCBRP and over the
intersection of Arapahoe Avenue and Foothills Parkway (Fig,
Sb) . Prior to construction of the grading improvements,

Love & Associates, Inc.

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