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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />i I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />~ <br /> <br />The true free water table beneath the <br /> <br />basin is quite deep, and will have little effect on runoff within the <br /> <br />basin. Except in the strean beds, the water table will be found at a, <br /> <br />depth in excess of 200 feet, A few deep wells have been drilled in <br /> <br />the basin, but records of the upper major water table are sparse. <br /> <br />The swampy areas referred to previously, <br /> <br />on the other hand, tend to collect water near the surface. These areas <br /> <br />would be greatly affected by antecedent storms. If the design storm <br /> <br />should take place after a wet period, these areas would act as nearly <br /> <br />impermeable areas. Runoff would be quite rapid, if not quite instan- <br /> <br />taneous. This study has taken this into account by assigning a more <br /> <br />rapid runoff rate to these areas. The antecedent moisture in other <br /> <br />areas has been taken as normal - or condition II, as defined by the <br /> <br />scs. <br /> <br />Cottonwood Creek has a base flow which <br /> <br />varies from zero to about two cfs. This, in itself, is not sufficient <br /> <br />to affect the point hydrographs, but it does affect flow by saturating <br /> <br />the alluvium along the creek bed. The same saturated sands can be <br /> <br />found along the south branch in basin 23, <br /> <br />'1 <br /> <br />/"'" <br /> <br />Cy 0~ <br />V-J' ), <br />JP ,,'P /(_ u '}-,</' <br />)'J \ r} 'if \ <br />\Y:1J .h ~ \\1" \\. I <br />',y 71}', y. ..--"/) <br />. ,J ~ ..-{\ <br />'. ~,\ <br />, ~ '-: ~\('\~~ <br />~'l~\ <br /> <br />-12- <br />