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<br />~ fo~ the period 1937-1943 averaged 28.802 acre-feet per year. This <br />""" <br />C\J watershed only covers an area of 32 square miles. The average annual <br /> <br />run-off for the period 1937-1943 was 900 acre-feet per square mile of <br /> <br />watershed. East Rifle Creek carries an unusually good Bummer and winter <br /> <br />base flow which seldom drops below 25 second-feet. The run-off of Middle <br /> <br />and West Rifle Creeks is flashy. An estimated 40 to 60 percent occurs <br /> <br />in the two months of May and June. <br /> <br />Water Records <br /> <br />stream flow and canal diversion records used in the preparation of <br /> <br />project water supply studias are available as follows: <br /> <br />stream <br /> <br />Length of Record <br /> <br />*East Rifle Creek <br /> <br />November 1937-0ctober 1943 <br /> <br />#Rifle Creak <br /> <br />November 1940-october 1944 <br /> <br />--Grass Valley ,Canal <br /> <br />Irrigation season 1937-1944 <br /> <br />*The East Rifle Creek Gaging Station is located immeduately upstream <br />from the head of the Grass Valley Canal. Three small diversion <br />ditches are operated above the gaging station. <br />#The Rifle Creek Station is located below tl}e confluence of Middle. <br />West and East Rifle Creeks near the Rifle Gap dam site. A number <br />of small dive~sions are operated on all three forks of the creek and <br />the Grass Valley Canal. a large diversion from East RIfle 'Creek is <br />operated upstream from the station. <br />~Diversion by the Grass Valley Canal is measured near the head 8flEI.. <br /> <br />, <br /> <br />Reliable information is not available on the diversion of small <br /> <br />ditches and data on diversion by the Grass Valley Canal is only available <br /> <br />:~ <br /> <br />for the irrigation months. During the non-irrigation season water is <br /> <br />diverted by the Grass Vall'ey Canal as needed for filling the Harvey Gap <br /> <br />Reservoir. Records are not available to show such diversions. Monthly <br /> <br />summaries of the stre~m ~Jn-off data collecte~ at the three stations is <br /> <br />given in the following tables: <br /> <br />v <br />