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Last modified
1/26/2010 10:09:33 AM
Creation date
10/5/2006 4:26:24 AM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
281
County
Boulder
Community
Boulder
Stream Name
Boulder and Adjacent Boulder County Drainageways
Basin
South Platte
Title
Flood Hazard Area Delineation - Boulder and Adjacent County Drainageways
Date
5/1/1987
Designation Date
10/1/1987
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br /> TABLE 2 TABLE 3 <br /> Ra i nfa 11 Depths (Inches) / I-Hour Duration Design Storm Distributions of I-Hour NOAA Atlas Depths <br />Basin 2-Year 5- Year lo-Year 50-Year loo-Year Tille Percent of NOAA Rainfall Atlas Depth <br />Kings Gulch 1.00 1.41 1.70 2.30 2.65 Minutes 2-Year 5-Year 10- Year 50-Year 100- Year <br />Bluebell Canyon Creek 0.94 1.35 1.65 2.25 2.55 5 2.0 2.0 2.0 1.3 1.0 <br />Gregory Creek 0.95 1.36 1.63 2.28 2.58 10 4.0 3.7 3.7 3.5 3.0 <br />Sunshine Canyon Creek 0.94 1.35 1.62 2.25 2.55 15 8.4 8.7 8.2 5.0 4.6 <br />Skunk Creek *N/A *N/A 1.65 2.25 2.55 20 16.0 15.3 15.0 8.0 8.0 <br />Bear Canyon Creek *N/A *N/A 1.65 2.25 2.50 25 25.0 25.0 25.0 15.0 14.0 <br />Elmer's Twomile Creek *N/A *N/A 1.70 2.35 2.65 30 14.0 13.0 12.0 25.0 25.0 <br />Goose Creek *N/A *N/A 1.70 2.30 2.55 35 6.3 5.8 5.6 12.0 14.0 <br />Wonderland Creek *N/A *N/A 1.60 2.25 2.50 40 5.0 4.4 4.3 8.0 8.0 <br />Fourmi 1 e Canyon Creek 45 3.0 3.6 3.8 5.0 6.2 <br />(Upper Basin) *N/A *N/A 1.65 2.30 2.55 50 3.0 3.6 3.2 5.0 5.0 <br />Fourmi 1 e Canyon Creek 55 3.0 3.0 3.2 3.2 4.0 <br />(Lower Basin) *N/A *N/A 1.70 2.35 2.65 <br />Twomil e Ca nyon Creek 60 3.0 3.0 3.2 3.2 4.0 <br />(Upper Bas in) *N/A *N/A 1.60 2.20 2.45 65 3.0 3.0 3.2 3.2 4.0 <br />Twomil e Ca nyon Creek 70 2.0 3.0 3.2 2.4 2.0 <br />(Lower Basin) *N/A *N/A 1.70 2.30 2.65 75 2.0 2.5 3.2 2.4 2.0 <br /> 80 2.0 2.2 2.5 1.8 1.2 <br />*(N/A) The 2-year and 5-year events for these streams were extrapolated. 85 2.0 2.2 1.9 1.8 1.2 <br /> 90- 2.0 2.2 1.9 1.4 1.2 <br />The I-hour duration rainfall obtained from the NOAA Atlas is distributed into 95 2.0 2.2 1.9 1.4 1.2 <br />a 2-hour design storm for use with the CUHP pro9ram. The desired 2-hour storm 100 2.0 1.5 1.9 1.4 1.2 <br />duration is calculated for each recurrence frequency by multiplying each time 105 2.0 1.5 1.9 1.4 1.2 <br />increment by the percentages as shown in Table 3. The resultin9 2-hour storm 110 2.0 1.5 1.9 1.4 1.2 <br />depth is comparable to the 2-hour depth found in the NOAA Atlas. 115 1.0 1.5 1.7 1.4 1.2 <br /> 120 1.0 1.3 1.3 1.4 1.2 <br /> Totals 15.7 115.7 115.7 115.6 115.6 <br /> <br />The Colorado Urban Hydrograph Procedure was completed utilizing the computerized <br />model (CUHPB) as currently approved by the Urban Drainage and Flood Control <br />District. The basin parameters required as input into the CUHPB model include <br />the Basin Area (A), basin length along the flow path (L), length to centroid <br /> <br />7 <br />
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