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Last modified
1/25/2010 6:23:49 PM
Creation date
10/4/2006 10:42:38 PM
Metadata
Fields
Template:
Floodplain Documents
County
Garfield
Community
Rifle
Stream Name
Rifle area rivers and streams
Basin
Colorado Mainstem
Title
Hydrology Study Rifle
Date
12/6/1971
Prepared For
Rifle
Prepared By
CWCB
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br /> <br />3 <br /> <br /> <br />. <br /> <br />" <br /> <br />,elow the mouth of Roaring Fork River in 1966. Drainage area <br /> <br />at . ""nt site is 6013 square miles. This is the closest long term <br /> <br />stat, <br /> <br />.',ifle. T;:1e closest long term station downstream of Rifle <br /> <br />is Came. <br /> <br />.. i eh was :Lnstalled in 1934 and has 8050 square miles of <br /> <br />drainsge area. Prior to 1934 the closest downstream station was <br /> <br />Palisade, which was just below Cwaeo (DAc8190 sq. rr~.). <br /> <br />FLOOD COMPUTATI01~ <br /> <br />A streamflow frequen'~y analysis was made on the Rifle Creek record. and <br /> <br />peak flow curves were drawn for snowmelt floods and rsin floods, and <br /> <br />also maximum annual peaks (see attached chart). These frequency curves <br /> <br />. <br /> <br />are for pre-Rifle Gap Dam conditions. In order to properly assess the <br /> <br />effects of the existing Rifle Gap Reservoir, and to arrive at flows <br /> <br />from other areas, a standard project cloudburst depth area curve was <br /> <br />developed. This curve is also attached. An isohyetal map of the <br /> <br />standard project storm was developed from the depth area curve and Was <br /> <br />used to compute rainfall over each sub-basin. This procedure was used <br /> <br />because of the unusual shape of Government Creek with respect to the <br /> <br />normal areal shape of a cloudburst storm. The storm wall. positioned <br /> <br />so as to get the maximum runoff from Govern~ent Creek~ which is the <br /> <br />largest contributor because of the control on Rifle Creek. Storm <br /> <br />amounts for other frequency events (lO-year to 500-year) were computed <br />, \J 1\ <br />i'l'(".'l\'lttl,'t n;'.L <br />as a percent of the SPS. AAredording station at Grand Junction has been <br /> <br />in service since 1892. A frequency cOiliputation of this data was made <br /> <br />. by the Soil Conservation Service for their cooperstive Indian Wash <br />
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