FLOOD09349

• County: Larimer
• Community: Fort Collins
• Stream Name: Spring Creek
• Basin: South Platte
• Title: Previous Study Review Spring Creek Hydrology Reports
• Date: 1/23/1980
• Prepared For: Larimer County
• Prepared By: Gingery Associates, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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1623.001

PREVIOUS STUDY REVIEW

SPRING CREEK HYDROLOGY REPORTS

January 23, 1980

Several studies have been prepared for the Spring Creek basin in the
last 20 yea.rs. The object of this \~ork ~Ias to establish runoff quantities
for design of flood plain improvements. The first tl'/O reports dealt with
storm frequencies with recurrence intervals from 10-50 years. Runoff
was calculated using the Rational method. The later reports used a
more sophisticated form of storm runoff analysis, the CUHP model formulated
for the Denver area. The later reports also adopted a lOO-year frequency
storm event for the basis of alternative improvement design. Starting
with the Black and Veatch report in 1971, the area north of the basin
was expected to contribute flow to Spring Creek. Through the use of
irrigation canals, water was to be imported into the basin, thereby
relieving downtown Fort Collins of these flood discharges.

There are no stream-gaging stations in the basin or on similar streams
in the area. Therefore, hydrological analysis is based on methods using
rainfall intensity and soil characteristics.

Shown in Table 1 is a list of past reports published on Spring Creek
Basin flood hydrology. A brief summary of each report is a part of this
review report. The purpose is to make use of past information, eliminate
duplication and continue to build upon this data.