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FLOOD03238
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Last modified
1/29/2010 10:11:51 AM
Creation date
10/4/2006 11:34:07 PM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
138
County
Jefferson
Denver
Community
Lakewood
Stream Name
Lakewood Gulch
Basin
South Platte
Title
FHAD - Lakewood Gulch
Date
2/1/1979
Designation Date
5/18/1979
Prepared For
Lakewood, Denver County, Jefferson County
Prepared By
UDFCD
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />I <br />I <br />I <br />I <br /> <br />Precipitation <br /> <br />Rainfall data were taken from Figures 7-1 through 7-8 of the <br /> <br />Drainage Criteria Manual. <br /> <br />These figures show that depths of <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />given frequency rainfall events vary somewhat over the basin. <br /> <br />Accordingly, the basin was divided into rainfall regions and <br /> <br />Hydrologic <br />Point <br />Designation <br /> <br />8 <br /> <br />Table 1 <br /> <br />TOTAL RAINFALL DEPTHS <br /> <br /> Rainfall Depth in Inches <br />2-Year 5-Year lO-Year 100-Year <br />Frequency Frequency Frequency Frequency <br />80-Min. 100-Min. 120-Min. 180-Min. <br />Duration Duration Duration Duration <br />(2) (3) (4) (5) <br /> <br />rainfall depths were calculated for each region. Rainfall <br /> <br />(1) <br /> <br />depths for 2, 5, 10, and 100-year frequency rainfall events in <br /> <br />the regions and the various hydrologic points to which they ap- <br /> <br />Lower Lakewood Gulch <br />101 <br />102 <br />103 <br />104 <br /> <br />ply are shown on Table 1, which follows. Rainfall durations <br /> <br />shown in Table 1 headings are the durations used for hydrograph <br /> <br />analysis as determined from the characteristics of some 68 Den- <br /> <br />Central Lakewood Gulch <br />105 <br />106 <br />107 <br />108 <br />109 <br /> <br />ver area rain storms. The point rainfall amounts taken from <br /> <br />the source data were reduced by an area correction factor for <br /> <br />sub-basins larger than five square miles. <br /> <br />Upper Lakewood Gulch <br />110 <br />111 <br />112 <br />113 <br />114 <br /> <br />I <br />I <br /> <br />The time rate of accumulation of rainfall depth was determined <br /> <br />from the Drainage Criteria Manual. Depending on sub-basin <br /> <br />area, rainfall accumulation was divided into 10 or lS-minute <br /> <br />Lower McIntyre Gulch <br />400 <br />401 <br />402 <br />403 <br />404 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />increments for each storm duration, and a typical storm pattern <br /> <br />was determined from the study of Denver area rain storms. The <br /> <br />total rainfall amounts for each frequency rain were distributed <br /> <br />Upper McIntyre Gulch <br />405 <br />406 <br />500 <br /> <br />according to the typical rainfall pattern for the development <br /> <br />of runoff hydrographs. <br /> <br />Dry Gulch <br />200 <br /> <br />South Lakewood Gulch <br />300 <br /> <br />0.79 1.30 1.83 2.75 <br />0.79 1. 30 1.83 2.75 <br />0.79 1.30 1.83 2.75 <br />0.77 1. 35 1.91 2.82 <br />0.77 1.35 1.91 2.82 <br />0.77 1.35 1. 91 2.82 <br />0.77 1.35 1.91 2.82 <br />0.77 1.35 1.91 2.82 <br />0.77 1.35 1.91 2.82 <br />0.75 1.35 1. 90 2.80 <br />0.75 1. 35 1.90 2.80 <br />0.75 1. 35 1.90 2.80 <br />0.75 1.35 1.90 2.80 <br />0.72 1.32 1.85 2.75 <br />0.75 1.35 1.90 2.80 <br />0.75 1.35 1.90 2.80 <br />0.75 1.35 1.90 2.80 <br />0.75 1.35 1.90 2.80 <br />0.75 1.35 1.90 2.80 <br />0.72 1.32 1.85 2.75 <br />0.72 1.32 1.85 2.75 <br />0.72 1.32 1.85 2.75 <br />0.77 1.35 1.91 2.82 <br />0.75 1.35 1.90 2.80 <br />
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