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Last modified
1/25/2010 7:08:59 PM
Creation date
10/5/2006 2:16:49 AM
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Floodplain Documents
County
Statewide
Basin
Statewide
Title
Estimating Design-Flood Discharches for Streams in Iowa Using Drainage-Basin and Channel-Geometry Characteristics
Date
1/1/1993
Prepared For
Iowa City
Prepared By
USGS
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />1,000,000 <br /> <br />100,000 <br /> <br />10,000 <br /> <br />o <br />~ <br />(,) <br />UJ <br />l/) <br />a: <br />UJ <br />"- <br />I- <br />UJ <br />UJ <br />"- <br />(,) <br />CD <br />::> <br />(,) <br />;;:: <br />ui 100 <br />Cl <br />a: <br />... <br />I <br />(,) <br />l/) <br />is <br />...J <br />~ 1,000,000 <br />a: <br />UJ <br />I- <br />Z <br />J; <br />(,) <br />z <br />UJ <br />~ 100,000 <br />::> <br />(,) <br />UJ <br />a: <br />a: <br />... <br />UJ <br />>- <br />6 <br />~ 10,000 <br /> <br />1,000 <br /> <br />1,000 <br /> <br />100 <br /> <br />A. <br /> <br />Q = lOD-year recurrence-interval discharge <br />100 <br />BFW; Bankfull width <br /> <br /> <br />. <br />. <br /> <br />Region I 1 09 <br />Q ; 122 BFW' <br />100 <br /> <br />. <br /> <br />. <br /> <br />. Region I streamflow-gaging <br />stations, n _ 78 <br /> <br />. <br /> <br />10 <br /> <br />100 <br /> <br />1,000 <br /> <br />BANKFUll WIDTH, IN FEET <br /> <br />B. <br /> <br />Q = 1 OO.year recurrence-interval discharge <br />loo <br /> <br />ACW; Active channel width <br /> <br /> <br />Region I .. 0.828 <br />Q ; 566 ACw <br />loo <br /> <br />. <br />. <br /> <br />. <br />. <br /> <br />+ + <br /> <br />/: <br /> <br />Statewide .. 0.833 <br />Q ;458ACW <br />tOO <br /> <br />+ <br />+ <br /> <br />+ <br /> <br />. Region I streamflow-gaging <br />stations, n "" 120 <br /> <br />+ Region II streamflow-gaging <br />stations, n OK 37 <br /> <br />Region II 112 <br />Q ; 75.0 ACW <br />tOO <br /> <br />10 <br /> <br />100 <br /> <br />1,000 <br /> <br />ACTIVE-CHANNEL WIDTH. IN FEET <br /> <br />Figure 9. Relation between 1 OO-year recurrence-interval discharge and channel width for (A) bankfull and <br />(8) active-channel widfh regression equations. <br /> <br />ESTIMATING DESIGN.FLOOD DISCHARGES USING CHANNEL-GEOMETRY CHARACTERISTICS 29 <br />
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