FLOOD01898

• County: Larimer
• Community: Estes Park
• Stream Name: Big Thompson, Fall Rivers
• Title: Hydrology Report for Estes Park and Larimer County FIS
• Date: 2/1/1984
• Prepared For: FEMA
• Prepared By: Simons Li & Associates Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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2.2

Flows on the Big Thompson River were developed based on a Log Pearson

Type III distribution of 29 years of record at the Lake Estes gaging site.

Flow values were adjusted by regionalized skew.

Discharges were also estimated from total drainage area and mean annual

precipitation using procedures in the Colorado Water Conservation Board's

Technical Manual No.1 (Reference 3). These values were then combined with

those obtained from gage records to obtain the weighted averages recommended

for use.

The above process was also used to determine weighted discharges for the

Fall River. Since no gaging records exist for the Big Thompson above Fall

River or Black Canyon Creek, flows were determined from drainage area and mean

annual precipitation following the guidelines in Technical Manual No.1.

The discharges determined by these methods are listed later in Table 3.2.

They are compared with values obtained by other analyses.