FLOOD04543

• County: Statewide
• Community: Harrison County, Iowa
• Basin: Statewide
• Title: California Bend Missouri River Fish and Wildlife Mitigation
• Date: 11/1/1994
• Prepared For: US Army Corps of Engineers
• Prepared By: Greenhorne & O'Mara, Inc.
• Floodplain - Doc Type: Data ‎(general)‎

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EXPLANATION

IT!!] AREA OF EOUAL 2-YEAR, 24-HOUR PRECIPITATION
INTENSITY -NulTbet is preciphation intensity, in inches

FIgure 5. Distribution of 2-year, 24-hour precipitation intensity for Iowa and southem Minnesota.

reference and the cartographic data source used
for both GIS procedure and manual
measurements.

streamflow-gaging stations used in the
drainage-basin flood-estimation method. These
comparison measurements were made for those
primary drainage-basin characteristics
identified as being significantly related to flood
runoff in the multiple-regression equations
presented in the following section entitled
"Drainage-Basin Characteristic Equatioll8-'
Comparison measurements were made from
topographic maps of the same scales as were
used in the GIS procedure. The results of the
comparisons are shown in table 1.

Verification of Drainage-Basin
Characteristics

To verify that the drainage-basin
characteristics quantified using the GIS
procedure are valid, manual topographic-map
measurements of selected drainage-basin
characteristics were made for 12 of the

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E8TJMATlNG DESIGN.FLOOD Dl8CllABGES U81NG DIlAIHAGB-IIA8DI CIIAIIACTIlIIII II