FLOOD10395 ‎(2)‎

• County: Montezuma
• Community: Dolores
• Stream Name: Dolores River
• Title: Dolores River near Dolores, Colorado, Flood Insurance Study
• Date: 5/1/2004
• Prepared For: Dolores
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Floodplain Report/Masterplan

List of Tables
Table Title Page e
Table 1 Average Monthly Temperatures (F) 9
Dolores River Basin above Dolores Colorado
Table 2 Precipitation Stations, Annual Average, Maximum, Minimum 10
Dolores River Basin, Colorado
Table 3 Average Monthly Precipitation, Dolores River Basin, Colorado 11
Table 4 Recorded Peak Flow (cfs), (Rainflood and Snowmelt) 12
with Gaging Station Information, Dolores River
above McPhee Reservoir near Dolores, Colorado
Table 5 Observed Peaks above 5000 efs Dolores River at Dolores Gage 13
Table 6 Subbasin Names, Locations, and Drainage Areas 17
Table 7 Unit Hydrograph Parameters 20
Table 8 Routing Reach Parameters (Most Upstream Point to McPhee 21
Reservoir)
Table 9 Muskingum Parameters (Most Upstream Point to McPhee 22
Reservoir)
Table 10 User Gage Weighting, 5-6 September 1970 23
Most Upstream to McPhee Dam Precipitation (inches)
Table 11 Observed vs. Reproduced Flood Peak Flows, 24
Dolores River below Rico and Dolores River at Dolores Gage
Table 12 Regional Analysis for I-day vs. 2-day 1 % Storm, Precipitation 25
Depths for Stations in or near Upper Dolores River Basin.
Table 13 Precipitation Depths (inches) for I-Percent Chance Exceedence 27 e
Event, 2-Day General Rain Event on the Dolores River, Areally
Distributed Precipitation
Table 14 Peak Flow (cfs), 1 % Exceedence 2-Day General Storm 28
West Fork vs. East Fork Centering
Table 15 Streamflow Gaging Stations 29
(See Plate 2 for locatllons and Table 4 for additional information.)
Table 16 Peak Flow Frequency for Dolores River 33
Flood Magnitudes and Percent Chance Recurrence
Table 17 Frequency Curves Compared to HMS Model Results 34
1 % Chance Exceedence Storm
Table 18 Comparison Table of 1 % Rainflood Peak Flows (cfs) 36
Dolores River below Rico and Dolores River at Dolores
Table 19 Snowmelt and Rainflood Frequency (cfs) 37
Summary Flood Insurance Study 2004, Dolores River near Dolores
Table 20 Peak Flow 1 % Exceedence, Flood Insurance Study - 2004 38
Dolores River near Dolores Colorado
Table 21 McPhee Reservoir, Annual Maximum Stage and Storage 39
Simulated Reservoir Operation for 1 % Peak Flow Event
McPhee Dam and Reservoir, Colorado
Table 22 Simulated Reservoir Operation for 1 % Peak Flow Event 41
McPhee Dam and Reservoir, Colorado
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