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<br />_..._hypothetically _purchased,_ <br />~ <br />QCl <br />W <br /> <br />-) <br /> <br />. <br /> <br />. <br /> <br />_ the-2.mounL.oL_credi,t _to_be _ <lpplied froE1_____ <br /> <br />e01ch <br /> <br />s~corage and <br /> <br />"the maximum permanent <br /> <br />sha:ce, <br /> <br />initi011 perm01nent pool <br /> <br />pool size. <br /> <br />Basic01lly, '1:118 progT01in computes evapora'tion from the <br /> <br />additional surface O1rea caused by adding the permRnent pool store>.ge <br /> <br />to the hist.oric cons<O:.rvation pool s'corug'2, c.nd, if the credi,t is <br /> <br />larger l:han ,the evaporation, it: adds the difference to the permanent <br /> <br />pool storage, but, if i-t is no-t, it subtracts the diffm:ence to <br /> <br />determine the new permanent pool s'::_orage. <br /> <br />If t.he permanen'<: pool <br /> <br />storc::.ge exceeds the maxirnum size the excess is con[;ic1s-red to b~ <br /> <br />sJ?illeCi in-co .t1v~ C01!.sl~~r\'Ci.l:.ioll pool :t:or c'Jle lJ~ileIii.:. oE .l'.L(~ ir:cigc:d:,ol:"s <br /> <br />so t.h2. t the !HCl.ximum. size canno"t 08 Qxcccdcc1. <br /> <br />ComputaU.ons are performed by a trial and error procedure <br /> <br />for periods of U_me \.;hen the change in conserva.b_on pool storage is <br /> <br />un:i.form so tha"t 2.verc:.ge storage can be computed by averaging the <br /> <br />s-tora'ges on the fil:S't emd last day of' 'che period. <br /> <br />Periods cannot <br /> <br />be longer '<:han a l~.oni:h, bu'i: usually there C'.re several ",i thin a <br /> <br />mon-<:h. <br /> <br />The average conservco:!:ion pool storage is cor.\puted and its <br /> <br />area is deteDllined from the most recent area-capaci,ty table. An <br /> <br />aver",ge permanent pool s-torage is assumed, and a total area is <br /> <br />c1e-i:ermined from the total of '::he t\vO average s-torages and the area- <br /> <br />capacity 'cable. ~'J1e permanent pool evapora:tion for the period is <br /> <br />computed by multiplying -the :recorrunenc1ed pan coefficient of 0.70 <br /> <br />t.:l~r.2:$ _ t118 _00_s~srvq(J _P91'l_E_~v:_~po}:-?ti.ol"!_ times t.he <br /> <br />0.iX~9}:-_~'nClO <br /> <br />of t.l~l'~ <br />-- ------ <br /> <br />-3- <br />