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FLOOD10216
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Last modified
1/26/2010 10:12:24 AM
Creation date
10/5/2006 5:00:43 AM
Metadata
Fields
Template:
Floodplain Documents
County
Statewide
Basin
Statewide
Title
Method for Estimating the Magnitude and Frequency of Floods at Ungaged Sites on Unregulated Rural Streams in Iowa
Date
1/1/1987
Prepared For
State of Iowa
Prepared By
USGS
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />Table 2.--Regional flood-freouencv eouations <br /> <br />Hydrologic region 1 <br />(l9 stations) <br /> <br />Equation for <br />indicated <br />recurrence interval <br /> <br />Standard error <br />(percent) <br /> <br />Q2 <br />Q5 <br />QlO <br /> <br />_ 211AO.62 <br />= 502AO.60 <br />_ 757AO.60 <br /> <br />28 <br /> <br />6l <br /> <br />37 <br /> <br />- 1 140AO.57 <br />, <br /> <br />- 1 500AO.60 <br />, <br /> <br />1 880AO.60 <br />, <br /> <br />Q25 <br />Q50 <br />Q100 = <br /> <br />24 <br /> <br />21 <br /> <br />24 <br /> <br />Hydrologic region 3 <br />(119 stations) <br /> <br />Equation for Standard error <br />indicated (percent) <br />recurrence interval <br />Q2 129AO.62 44 <br />Q5 _ 265AO.59 36 <br />Q10 = 381AO.57 35 <br />Q25 _ 555AO.55 37 <br />Q50 695AO.54 39 <br />Q100 = 851AO.53 41 <br /> <br />Hydrologic region 5 <br />(8 stations) <br /> <br />Equation for Standard error <br />indicated (percent) <br />recurrence interval <br />Q2 = 30AO.66 27 <br />Q5 37AO.71 21 <br />QlO 41AO.74 20 <br />Q25 45AO.77 24 <br />Q50 47AO.79 24 <br />Q100 - 50AO.8O 26 <br /> <br />Hydrologic region 2 <br />(8l stations) <br /> <br />Equation for <br />indicated <br />recurrence interval <br /> <br />Standard error <br />(percent) <br /> <br />Q2 _ 196AO.57 55 <br />Q5 _ 402AO.55 39 <br />QlO = 570AO.55 34 <br />Q25 _ 821AO.54 32 <br />Q50 = 1 020AO.53 33 <br />, <br />Q100 - 1 230AO.53 36 <br />, <br /> <br />Hydrologic region 4 <br />(24 stations) <br /> <br />Equation for Standard error <br />indicated (percent) <br />recurrence interval <br />Q2 31AO.77 40 <br />Q5 = 67AO.72 33 <br />QlO _ 98AO.70 31 <br />Q25 _ l45AO.68 29 <br />Q50 _ 180AO.66 30 <br />Q100 227AO.65 30 <br /> <br />28 <br />
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