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Last modified
1/25/2010 7:09:12 PM
Creation date
10/5/2006 2:20:47 AM
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Template:
Floodplain Documents
County
Statewide
Basin
Statewide
Title
Colorado Erosion Control Manual
Date
11/1/1992
Prepared For
CWCB
Prepared By
USGS
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />Hydrology. . <br /> <br />e <br /> <br />2.4 Hydrology.- <br /> <br />2.4.1 Introduction. <br /> <br />Hydrology is the science related to the behavior of water as it occurs in the atmosphere. <br />on the surface of the ground, and undergrOlmd. It provides the basic data and methods <br />required to solve problems related to the control and use of water. The process of water <br />movement through the atmosphere, surface runoff, and groundwater is commonly <br />referred to as the hydrologic cycle. Of particular concern in regards to erosion processes <br />and control thereof include the surface runoff phase of the hydrologic cycle. Although <br />techniques and methods for conducting hydrology studies are available to solve a wide <br />spectrum of water resoun:e problems. only those related to erosion analysis wiD be <br />addressed in this chapter. Numerous texts bd references are available in the literature. <br />should the reader be interested in other hydrology methods and topics. <br /> <br />Analysis of sediment transport and erosion problems typically begins with an analysis <br />of the hydrologic conditions affecting the stream. Frequency and duration of various <br />magnitudes of stream1lows are important factors in determining the causes of erosion <br />problems and developing the best solutions to fix the problem. Two types of hydrologic <br />data are usually developed for streambank erosion and sediment transport studies. These <br />include developing the discharge-frequency relationship and flow duration relationship <br />for the stream at the location of interest. <br /> <br />The discharge-frequency relationship represents the annual probability of obtaining a <br />discharge exceeding a certain magnitude. The flow duration relationship represents the <br />percent of time that a given discharge wiD be equalled or exceeded. Hydrologic data <br />used to derive the discharge frequency relationship for gaged streams consist of the <br />annual peak discharge for each year of record. For the flow duration relationship, the <br />hydrologic data nonna1ly consist of the entire array of all daily discharges which <br />occurred during the period of record. Numerous methods are available to synthesize the <br />discharge frequency and flow duration relationships or to synthesize the data required to <br />develop these relationships for ungaged streams without streamflow records. <br />Description of those methods is beyond the scope of this manual, but can be found in <br />many of the numerous hydrology texts and technical papers available in the literature. <br /> <br />2.4.2 Use of Discharge Frequency Intonnatlon - <br /> <br />Noonally, the discharge frequency relationship is used to derive or quantify a design <br />flood. In the design of erosion control structures, the discharge frequency relationship <br />can be used to determine the probability of a flood occwring which could cause failure <br />of the project. This infoonation can be used to detennine the feasibility of the project <br />based on an economic or useful life analysis. <br /> <br />An example application for evaluating three alternative erosion control projects along <br />with the design and cost data are presented in Table 2-2. <br /> <br />. <br /> <br />Colorado Erosion Control Manual <br /> <br />11 <br />
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