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<br />e <br /> <br />/ <br /> <br />e <br /> <br />e <br /> <br />~ <br />..t"' <br /> <br />( <br /> <br />/' <br />~~\~::: "\ ~~~. , 1\ <br />r. of .;.... ~ ~ \. . ,. ;.... ~ --. ~ <br />.~~.~ ;~-!. ~~--;... ~ ~~~,/~~~ ~i!<: f~~ <br />r ,,-" - ., Cj '~; ~ i' \. <br />.-: ,- 1.;'; c .1 <br />.1 ....6 ',; 1 <br /> <br />I <br /> <br />~~I <br />1: ..~:,.~ .~ <br />: '.. " \.. <br />I ~ , . ..' <br />..' ....; <br />'" .... <br /> <br />Mr. Jesse <br />,"~arch 10, 1930 <br />Page 13 <br /> <br />f - 0- ._~:::::-:::l <br />[D)[R1~~~ <br /> <br />to n;aintain a constant ten year average streamflow would be futi Ie <br />because of naturally changing hydrologic conditions. This residual <br />flow is only a portion or the Thatcher flow. The other portion of <br />the flow contributed by side channels could cause an even greater <br /> <br />variation in the ten year average flow at Thatcher. <br /> <br />As s;'O','Jn by the USSR studies, the flo'.<J at Thatcher on a long term <br /> <br />tasis was expected to remain the same as it would have been without <br />the Project. The general effect of the Project on an annual basis <br /> <br />\',ould be to 51 ishtly incre2se the flo;.; .at Thatcher over what it would <br />have been In dryer years and to slightly ~ecrease the flow at Thatcher <br />over what it would have been in wet years. Thus, the o~erall efrect or <br /> <br />the Prc.ject co\-mstreai;1 VieS ex;:>ectec to be a siT,all stabilizing effect on <br />the s t rea:Tir 10\'1. <br /> <br />We have presented several methods to indicate when a possible <br />ex?ansion of ..:ater USe has occurred in the Trinided Project area. If <br />any or all of these indicators suggest a possible expansion of use, <br /> <br />the <br /> <br />Engineer shculd exernine trends and specific hydrologic <br /> <br />SJ..::.~o <br />L..... __ <br /> <br />phe;-.o;ne.na anG employ k;lO\<Jlecge of the hydrologic conditions in the <br /> <br />area to de.ter.nine "/hetner a ciepartur(~ indicates an expanded use or <br /> <br />normal variations due to nature. <br /> <br />The subject covered herein is complex and we would look fO~Jard <br />to meeting with you to discuss this and answer any questions you may <br />have. <br /> <br />Sincerely, <br />Representatives of Trinided: <br /> <br />David L. Harrison <br /> <br />Raymond A. Hogan, P.E. <br /> <br />Representatives of the District: <br /> <br />Joseph P. McMahon, Jr. <br /> <br />Theodore M. Zorich, P.E. <br /> <br />PAH:sck <br />