FLOOD06286

• County: Yuma
• Community: Yuma
• Stream Name: Republican River
• Basin: Republican
• Title: Master Plan of Drainage Facilities Yuma
• Date: 10/1/1975
• Prepared For: Yuma
• Prepared By: Parker & Associates
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Chart I is a graphic representation of storm intensity values

for the Yuma, Colorado area. Table I is a summary of "c"

values (coefficients) for the use with the rational formula

analysis.

5.

UNIT HYDROGRAPH METHOD

The unit hydrograph procedure is a method of synthesizing a

complete runoff picture for a given area and storm. Chart

II, Indian Hills Hydrograph, is a graphic illustration of the

results of an application of this procedure to a particular

area. The information available as a result of an application

of this procedure includes not only the peak runoff for the

area, but also the approximate flow at any time during the

runoff process. With this information, it is possible to predict

the peak flow downstream from a point of confluence of two

channels under consideration.

The unit hydrograph method, as outlined in the following

paragraphs, is termed the Colorado Urban Hydrograph

Procedure" because coefficients are based upon data collectiun

and studies financed by the City of Denver and the Regional

Council of Governments. A more comprehensive presentation

of this method can be found in Volume I of the Denver Regional

Council of Governments - Urban Storm Drainage Criteria ManuaL

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