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Last modified
1/25/2010 6:28:14 PM
Creation date
10/5/2006 12:03:39 AM
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Template:
Floodplain Documents
County
Statewide
Basin
Statewide
Title
Comparison of Flood Hydrologic Estimates in Colorado
Date
5/1/1990
Prepared For
CWCB
Floodplain - Doc Type
Flood Documentation Report
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<br />charts for estimating probable maximum precipitation east of the 105th <br /> <br />meridian (Hydrometeorological Report No, 33) and west of the 105th meridian <br /> <br />(National Weather Service Technical Paper No. 38), The state of Colorado <br /> <br />being located both east and west of the 105th meridian is included in both <br /> <br />reports. Design of Small Dams cautions however that problems may arise <br /> <br />concerning small, mountainous watersheds, For those areas west of the 105th <br /> <br />meridian there are separate charts for a general-type storm which cover <br /> <br />relatively large areas of rainfall, and "for thunderstorm rainfall having <br /> <br />limited areal coverage." (Design of Small Dams, p.51) The thunderstorm <br />......---., <br />rainfall is estimated to have areal limits of l100 square miles,j50 square <br />~iles land 500 sqLtare miles depending on the basin location west of the 105th <br />meridian. <br /> <br />7 <br /> <br />ut ,J. <br />(0 ) \ ) <br /> <br />McCain and Jarrett (1976) recognized that in addition to the four major <br /> <br />basins, consideration must be made for mixed population flood areas and to <br /> <br />establish a transition zone between the rainfall flood zone (lower region) and <br /> <br />the snowmelt flood zone (Mountain Region), <br /> <br />by <br /> <br /> <br />(1988) there is the assumption that the <br /> <br />mixed <br /> <br />runoffs that are generated by snowmelt or <br /> <br />using a relationship involving discharge <br /> <br />as a function <br /> <br />elevation and source of the <br /> <br />the area includes consideration of the <br />\'< <br />\ <br /> <br />_ Y "n JJ> <br />~y ~.~ <br /> <br />'( <br /> <br />9 <br />
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