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<br />,.., <br />. ~ <br /> <br />...) <br />.,'- <br />..-t <br /> <br />The 16" ported ditch is on a 0.15% grade with 3" drops at each set to <br />maintain an elevation differential. <br />..~ <br /> <br />.:.::~ <br /> <br />Automation is accomplished wiht portable drop-close times gates. Ir- <br />rigation is started at the lower end and progresses upstream. <br /> <br />This system consists of 1270 feet of concrete ditch and has 7 irriga- <br />tion sets, Installation of a measuring weir and trash cleaner will be done <br />at the time the supply lateral is improved. <br /> <br />SEMI-AUTOMATED GATED PIPE SYSTEM W/IN-LINE VALVES - Wilson Sims/John Miller <br /> <br />This system consists of 1350' of 10" gated pipe, tied directly into the <br />lateral headgate through a measuring weir. Ungated surfa.ce aluminum delivers <br />to the 13 acre field, Irrigation sets are designed for a. 1.1 cubic foot/per <br />second flow, <br /> <br />Irrigation management design is for 100 furrows per set at 5 gallons per <br />minute each. A 14 hour set time is calculated to optimi2:e irrigation <br />efficiencies and minimize deep percolation. <br /> <br />The system is set to grade, to deliver the desired flow below the pre- <br />set open gates. In-line valves with a .3' drop unit separate the five sets, <br />A mechanical timer drops the valve closed at the end of the. desired set time. <br /> <br />Water bypasses each non-irrigation set until the valve closes and backs <br />water out the previous set. The drop units at each valve prevents flow from <br />backing out the open gates of the next set up the line, <br /> <br />Erosion control socks are used on each gate due to their elevation posi- <br />tioning for the bypass flow. <br /> <br />STOP 4: SEMI-AUTOMATED GATED SYSTEM - Roy Hood <br /> <br />This system includes a 12" delivery pipeline from the canal above to <br />the 22 acre field. The underground line continues across the head of the <br />field with open concrete standpipes at 220' set intervals. A dual flap- <br />valve assembly is used in each standpipe to close each underground outlet <br />while at the same time opening the gated outlets. <br /> <br />While a lower set is operating, the underground line from the stand- <br />pipe on any non-irrigating set is open and the gated outlet is closed. A <br />mechanical time-clock then drops an iron flap-valve to close off the under- <br />ground flow which in turn pulls open an aluminum flap-valve on the gated <br />flow in that standpipe. <br />