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FLOOD09755
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Last modified
1/26/2010 10:10:23 AM
Creation date
10/5/2006 4:37:36 AM
Metadata
Fields
Template:
Floodplain Documents
County
Weld
Community
Pierce
Stream Name
South Platte
Basin
South Platte
Title
Flood Control Investigation Pierce and Vicinity
Date
6/1/1939
Prepared For
Weld County
Prepared By
CWCB
Floodplain - Doc Type
Flood Mitigation/Flood Warning/Watershed Restoration
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<br />11. ESTD.IATED l,lAXnltJH FLOOD 1'10178 <br />During the field invesHgation 01' December 1938. efforts were <br />made to estimate the nwcimUItL flood flows 1'rom obserlTed high water marks <br />and f'r01ll cross seotions and slope measurements. On.~ such estimation <br />made at a point approximately one mile North of the Town of Pierce <br />indicated that the crest flow during the 1935 flocdfl may )lave approxi- <br />mated 2000 to 2500 cubic fee'\; pe1" second" At the s.1.111e po:l.nt the maxi- <br />mum runoff dUring the 1938 flood appears to hav e be,'n app1"oximate1y <br />600 to 700 second feet. <br />Similar estimations vrere made at a point 3 miles North of Pierce <br />where the maximum flaw durinl~ 1935 appears to have been 1000 to 1200 <br />oubio feet, and in September 1938 to have approximated 500 second feet. <br />Using the Berkli-Zi,.gler formula. for the Spring Orsek water- <br />shed above the IAramie-Poudre. Canal. and assuming a drainage area of <br />67 square miles and a rainfall intensity of' two inohes per hour, the <br />runoff t!18.t might be expected: at the Laramie-Poudr'~ Canal would approxi- <br />mate 2350 oubio feet per seoond. <br />Suoh estimated rates of flow do not appear to have occurred <br />prior to the year 1935. It appeaJ:'s probable the,t llUClh f'1ood orests <br />might be greatly reduced by adequtl.te watershed treatrllent. <br /> <br />12. DISCUSSION OF FLOOD PREVENTION <br />The suggestion of enlarging the I..aramie-PCludre Canal to a <br />capacity suffioient to oarry i~he flood waters origi!lll,ting above that <br />oanal th1"ough the 17 miles of di toh to the MoGrew R.eservoi1" would be <br />an ideal solution of' the flood problem, e:x:'~ept from, the standpoint of' <br />oost. In 1935 a Works Progre,:s Administration project was i.nitiated <br /> <br />..12.. <br />
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