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BES monitored flow in Balch Creek from June 1996-September 2002. A preliminary analysis of the flow data revealed that average flow during the summer months over this time period was 0.2cfs, with a maximum of 60cfs and minimum of 0cfs. Average flow during the winter months was 1.9cfs, with a maximum of 73cfs and minimum of 0cfs.
Spring and fall flows were graphed to correspond with flow data for other Westside streams. However, since flow monitoring in Balch Creek ended in September 2002, fall and spring flows were not available for the same time period as the other Westside streams. Instead, fall and spring flows for the same range of months in 2001 and 2002 were graphed (Balch Fig's 9 and 11). During the spring (mid May-mid July 2002), flow started out at approximately 2.5cfs and dwindled to 0 by early June. Flow in Balch Creek through early June was influenced by precipitation, with the highest flow, 4.5cfs. occurring after a precipitation event (Fig's 9 and 10).
During the fall (late August to late December, 2001), flow in Balch Creek was low (close to 0cfs) until November. The largest flows during fall 2001 (19.2cfs on 11/28/01) occurred after many days of rain (Balch Fig’s 11 and 12). Still, not all rain events produced increased flows in the creek. For example, precipitation data show a rain event on 9/26/01 of 0.24 inches, but flow in Balch Creek did not increase significantly (Figures 11 and 12). This may have been due to the fact that it had not rained much before this date.
Click here for a summary of stream flow monitoring.
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