FLOOD08812

• County: Morgan
• Community: Fort Morgan
• Stream Name: Narrows Dam
• Basin: South Platte
• Title: Flood Study Narrows Dam South Platte River
• Date: 6/1/1975
• Prepared For: CWCB
• Prepared By: Dames & Moore
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Table II-l

Table II-2
Table II-3
Table II-4
Table II-S
Table II-6
Table III-l
'Table III-2
Table 1II-3
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Table III-S
Table III-6
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Table III-8
Table 1II-9
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Table III-IS
Table IV-l
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Table IV-3

LIST OF TABLES

Title
Comparison of Slopes on which June 7-8, 1964
Montana Storm Rainfall Centers were Observed
and Transposed

Comparison of Maximized Storms and PMP for Narrows
,Damsite Project Basin (9,955 sq. mi.) and Nearby Areas

Design Storm Recommended by USBR for Narrows
Damsite, Colorado

Design Storm with 0.94 x USBR Values of PMP
Design Storm with 0.91 x USBR Values of PMP
Sub-Basin Incremental Design Storm Values, Inches
Total Design Storm Precipitation
Comparison of Results from Weighting Land Use
Characteristics
Comparison of USBR and D&M Assumption on Land Use
Characteristics

Sample Computations of CN

Comparison of eN Estimates
USBR Retention Loss Studies in Mountain Areas

Results of Retention Loss Studies in Nearby Basins
Infiltrometer Tests in Kansas River Basin

Recommended Values of f
c
Reductions in Flood Volume Due to Non-Contributing
Areas

Reduction in Flood Volume by Storage in Water Supply
Reservoirs

Reduction in Flood Volume by Flood Control Reservoirs

Reduction in Flood Volume Due to Recomputations of Area
Above 1:\'10 Forks (inches)

Increase in Flood Volume Due to Subdividing MU Areas

Deductions from USBR Study under Alternative Assumptions
of PMP

Narrows Dam Economic Study - Summary

Routings to Demonstrate Frequency of Spillway Use

Flood Elevations in South Platte Valley

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