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FLOOD00704
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Last modified
11/23/2009 1:29:21 PM
Creation date
10/4/2006 9:25:47 PM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
188
County
Lake
Community
Unincorporated Lake County
Stream Name
Arkansas River, Lake Creek, Evans Gulch
Title
Floodplain Information Report - Arkansas River, Lake Creek, Evans Gulch
Date
11/1/1981
Designation Date
4/1/1982
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />Flood insursnce thr'~ugh the National Flood Insurance <br />availsble to s11 residents of Lake County only <br />Emergency Phase of the program, <br />The following amounts at the subsidized rares are available under <br />the Emel'gency Phase, effective October 1, 1981: <br /> <br />Prognlln is <br />under thOi' <br /> <br />V. HYDROLOGIC ANALYSIS <br /> <br />Single Family <br />Residential <br /> <br /> TABLE 7 <br />FLOOD INSURANCE RATES <br /> Subsidized <br /> Total Amount Rate per $100 <br /> Available of covers!",e <br /> $35,000.00 $ ,40 <br /> 100,000.00 ,40 <br /> 10,000.00 ,50 <br /> IOO,OOfl.i"(l ,50 <br /> 100,000.00 ,50 <br /> <br />Peak discharges fDr floDds of the 10-, 50-, 100-, and SOO-year <br />recurrence intervals were computed for the Arkansas River, Lak", <br />Creek, and Evans Gulch in Lake County, Colorado. Due to the high <br />altitudes of the Lake Creek and Arkansas River watersheds <br />(greater than 9000 feet) and the fact that recorded annual peaks <br />sre snowmelt (late spring and early summer) the rainfall portions <br />of the frequency curves were determined to be insirnificant to <br />the 10-, 50-, 100-, and 500-year flood flows. This study <br />therefore analyzes the snowmelt peaks. <br /> <br />Arkansas River <br /> <br />Oth"'r Residential <br /> <br />The hydrologic analyses for the Arkansas River were accomplished <br />by analyzing available streamgage records at the Granite gage <br />(07086000) located 4.8 miles do"mstream of the study site. For <br />this analysis, records f,Jr the period 1910 to 1979 "'ere analyzed <br />using the procedures recommended by Water Resources Council <br />Bulletin 17 (Refel'ence 10). The 1957 flood was considered a high <br />outlier in the calculations. Due to numerous and complex: <br />diversions in and out of the Arkansas River Basin upstresm of the <br />study site, no attempt was made to analyze or study the <br />diversions as was done for the Lake Creek Basin. <br /> <br />Contents, Residential <br /> <br />Small Business <br /> <br />Contents, Small <br />Business <br /> <br />Non-Residential <br /> <br />100,000.00 <br /> <br />1.00 <br /> <br />Knowing the flood flows at the gage site, the discharges were <br />transfered to the study area using the trB.nsfer equati')n fr'Jill <br />TM-l (Reference 12). It should be noted that the Malta gage <br />(07083700) which lies 9 miles upstream .Jf the study site was not <br />analyzed due to its extremely shDrt period of record (8 years). <br />ThE' pellk disch>lrges calculated Ilt the study site are as f.,llows: <br /> <br />Contents, Other <br /> <br />Within the next tw., years, Lake County will be converted from the <br />Et;'ergency Phaso; to t,he Reguhr Phase of the program. At that <br />t~me, substant~ally lncreased flood insurance coverage ,,'ill be <br />available. All property owners shown in this study to be within <br />areas subject to flooding should consider the purchase of flood <br />insurance. <br /> <br />TABLE 8 <br /> <br />ARKANSAS RIVER DISCHARGE DATA <br /> <br />Additional infvrmation on the Flvvd <br />available frvm local insurance agents or <br /> <br />Insuranee <br />brokers and <br /> <br />Prvf;ram <br />th..: <br /> <br />b <br /> <br />Descripti.)n <br />1. Downstream Limit <br /> <br />Drainage <br />Area (Sq. Mi.) <br />327.0 <br /> <br />Peak Dischar~es (cfs) <br />10-YR 50-YR 100-YR 500~YR <br /> <br />2255 2810 <br /> <br />3030 <br /> <br />3525 <br /> <br />Federal Emergeney Management Agency <br />Divisi.,n of Insurance IInd Mitigation <br />Building 710 <br />Denver Federal Center <br />Denver, Colo. 80225 <br /> <br />2. Downstream of <br />Box Creek <br /> <br />326.7 <br /> <br />2255 2810 <br /> <br />3030 <br /> <br />3525 <br /> <br />3. Upstream of <br />Bolt: Creek <br /> <br />311.2 <br />303.0 <br /> <br />21452675 <br />21452675 <br /> <br />2885 <br />2885 <br /> <br />3355 <br />3355 <br /> <br />Telephone 234-6582 <br /> <br />4. Upstream Limit <br /> <br />Comparison .of the results ,)f this AnAlYl'is with other studies in <br />the site (References 3, 4) show good agreement. <br /> <br />-19- <br /> <br />-20- <br />
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