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North Platte Basin Roundtable Meeting 10.30.2007 7 <br />ENDNOTES <br />A new diversion stn~cture will be a low-head structure, and they will build the <br />upstream V out of interloclang concrete blocks, and rebuild another area with native rock <br />from on-site (sandstone outcropping). Also need to seal the upstream V to get water to <br />go through the headgate. They will use the rock to create astair-step type structure, and <br />nui water down the center of the channel. Rock will go on a 10 to 1 slope to reduce <br />erosion. <br />They have designed an 8 ft x 2ft orifice to pass the planned 50 cfs. There will also be a <br />slew structure and a trash rack. They will move the measuring flume back upstream and <br />put it at the end of the structure. <br />Channel profile = 20 ft. pools followed by 6 inch lips, to reduce erosion and keep water <br />in the center of the channel. <br />~ Observed increase in nuloff quantity due to: 1. reduced canopy interception and <br />sublimation, 2. Increase in wintertime snow accumulation in cut strips, 3. Decrease in <br />sununertime evapotranspiration leads to reduced soil moisture depletion, 4. Reduced soil <br />moisture deficit. <br />