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<br />VII. DESIGN DEVELOPMENTS <br /> <br />Design programs ~ere developed for the Texas In5tru~e~t ~ocel 59 calcu~ato; ~o <br />?rc~~je quick, r~1:~~i0 infcr~ation !~r ~~?eline ~nd open ditch irriga~ic~ <br />~ater ~eli~ery designs, land l~~~ling, an~ irrigation systen evaluations. <br /> <br />Turnout structure designs were developed for large irrigation flows <br />(15-25 cfs). They proved to be an excellent means to control water. <br />l~rrovements to the structure were made during the project period to fill the <br />neecs of differing site conditions. Patterns for placement of energy <br />dissipation blocks were varied with discharge and head to provide a non- <br />erosive stream spread uniformly onto the field. <br /> <br />Minium compreasive concrete strength vas set at 2500 psi to improve quality. <br />Regular analysis of concrete strengths sho~ed good results and that design <br />requirements were being reached. This strength level has proven to be <br />effective for over ten years. <br /> <br />The in-ditch ~ified broad crested weir (Replogle Flume) developed during the <br />project provide~ easy and accurate water measurement capability. Early <br />~easoring flu~e installations ~ere of the long throated critical flow type. <br />T~~ lo~g t1roated fl~me has six critical surfaces requiring precision on-site <br />construction techniques and controls. The modified broad crested weir has on" <br />critical s~rface ~hich can be installed using a carpenter's level. ~hen <br />~ater ~Eas~rinb devices are installed in irrigation syste~s, they allo~ <br />~a~a8c~e~t of ~ater quantities for better distribution and ~ater savings. <br /> <br />Automatic surface irrigation system designs were developed and installed. <br />~:tr. l2~ge turnout structures, one irrigator can control irrigation ~ater <br />flo~s on up to ~50 acres. Thus, the incentive for automation was limited. <br /> <br />Using portable sprinkler systems to germinate lettuce has been successful in <br />S.3':~;)g \.l2ter. Ap?rDxiT:l.ately 1/4 as much \.iater is no,,", used. ....~it~ sprin.......lers to <br />ger~:~a~e lettuce than with surface irrigation. <br /> <br />l~;ro~ed farm irrigation systems and applied irrigation water management <br />iocreased irrigation efficiencies. This result also met the requirements of <br />the liellton-:looawk On-farm Irrigation Improvement Program. <br /> <br /> <br />, <br /> <br />~ . ::0 ...._...;..: <br /> <br />-- :-- . <br /> <br /> <br />.~~:". <br /> <br />.. <br /> <br />""",,,,:,,, "" <br />. ..~. ,..- ..~, <br />. . .~.:, - ...;..~ <br />..~ . ,'.&...~~"'... ""''',,~, <br />. ~.~~_ b <br />.... " <br />,,- '- <br />~. - '.., <br />,- <br /> <br />~'-"'>r,' <br />- ~, <br />_~ 4_ <br /> <br />Critical depth flume <br />installed in farm ditch <br />J <br /> <br />..~. <br /> <br />1-:- <br /> <br />, <br /> <br />- 9 - <br />