Laserfiche WebLink
<br />e <br /> <br />e <br /> <br />e <br /> <br />,,( <br /> <br />r--- <br />\. .. <br />P" ~~r:-F'f C", rur\f It. '''''J <br />~ tl i/. 1"'1 t~ ~-i c' 0 " J~ I.. ~ <br />.~. ~J.' t:-( fi n/ ~I'~';;" -:.;. '.'. <br />, : ~ ~__ ~ ti 1 V ~ U l ~ f- ~ r,~ e <br />m~~$ <br />\WJ u~ LC~ ~~-.u <br /> <br />~, . <br /> <br />( <br /> <br />Mr. Jesse <br />!.'.arch lO, 1980 <br />Page 8 <br /> <br />bet~ee~ the measured flow at Thatcher and the estimated flow without <br />the Project at Thatcher on a ten year average basis is significant. <br />If a c:)I";lparison betv:een ac,;:u21 and estimated flo\.: indicates a possible <br /> <br />expanded use, other checks should be performed to verify whether the <br />difference bet~Jeen actual and estimated flow is caused by an expanded <br />use of irrigation water or by the vagaries of nature. <br />In the fi rst method, the flow at Thatcher without the Project is <br />estir;;ated by ,adding the estimated side-channel inflO\v to the estir..atec <br />modified residual flow. These terms are defined and determined as <br /> <br />fclIO\./s. Side-c;h<mnel infla,v is the quantity of VJ2ter that enters the <br /> <br />?ur~atoire River between the Trinidad and Thatcher gages: <br /> <br />It is deter- <br /> <br />mi~ed from a relationship between excess precipitation and side-channel <br /> <br />inflc'", deteliTdne-: for- hlstoric21 cond~itions 25 s~o'.'Jn en Fisure 2. <br /> <br />Excess preci?itation is the sum of the precipitation in excess of 0.15 <br /> <br />inc~es per storm ror e2ch of the Trinidad, Trinidad Airport, and <br /> <br />Doherty Ranch precipitation stations. A storm is defined as total <br /> <br />precipitation occurring during one cr more'consecutive days in whith <br />days withcut precipitation do not occur two or more times in a row. <br />The side-channel inflmv sho.~TI on Figure 2 VJas determined by the differ- <br />ence bet'.'Ieen the measured fJO'.v at Thatcher and the historic residual <br /> <br />flo.v determined from the relationship shown on Figure 3. The relation- <br />ship sho..m on Fiqure 3 was determined from Table 2 on page 13 of <br />Volume II of the USSR Trinidad Project report. This table is attached <br />for reference. The historic residua'l flo\v is defined as the flO\v at <br />Trinidad less the historic depletion. <br />In Figure 4 the relationship between modified residual flow and <br />the flm"J at Trinidad is shovln. The modified residual flovoJ is defined <br />as the flow at Trinidad less the modified historic depletion from USSR <br />Table 2 attached, where the modified historic depletion is the deple- <br />tion which would result by assuming the total Model Reservoir Storage <br />