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<br />,~ <br /> <br />STOP 1: OVERLOOK FOR STAGE 1 <br /> <br />i'''''' <br />...-! <br />c_ STOP 2: SEMI-AUTOMATED PORTED CONCRETE DITCH - Tom Ross <br /> <br />This system is on 19 acres that was leveled this SUl1nner prior to instal- <br />lation. Approximately 11,000 cubic yards of work was done l~aving an irriga- <br />tion grade of about 1%. <br /> <br />The system is designed for a flow of 2 cubic feet per second. Based on <br />crop needs, soil properties, slope and length of run, per furrow application <br />will vary from 8 gallons per minute on the shortest runs up to 15 gallons <br />per minute on the longest. Number of rows per set is figured accordingly <br />from the total flow. To meet crop needs and minimize excess deep percolation, <br />optimum set time planned is 14 hours, <br /> <br />The system begins with a cutthroat-type weir for flow measurement and a <br />trash cleaning device manufactured locally. Ditch checks are used to direct <br />flow into either the south or west ditch sections. <br /> <br />The 18" ported ditch is set on a 0,15% grade. The 2" ports, drilled <br />after the concrete has set, are level along the length of the set. Drop- <br />close gated are installed between sets with a drop to allow flow below the <br />ports of nonirrigating sets, Gates are tripped by mechanical time-clocks <br />on the gate assembly, <br /> <br />To the south, irrigation begins at the bottom set and progresses at the <br />clocked intervals up the ditch. The gate is rigged with a flow-through by- <br />pass activated by the float assembly in the ditch for flows in excess of the <br />design, <br /> <br />This system consists of 800' of ditch to the south and 210' to the west <br />and incorporated 8 timed gates, <br /> <br />STOP 3: <br /> <br />SEMI-AUTOMATED PORTED CONCRETE DITCH - John Miller <br /> <br />This system irrigates 34 acres cropland. Fifteen acres of this field <br />was leveled this summer to an irrigation grade of 0.8%. <br /> <br />The design water supply is 1.5 cubic feet per second which will irrigate <br />170 foot set widths at 10 gallons per minute/per furrow. This is derived <br />from the SCS computerized IRMA program based on the field variables of soil, <br />slope, furrow spacing, etc.. The design set time from this program is 17 <br />hours. <br />