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<br /> <br />~ -i\ <br /> <br />~ 1 ~ .. .... _< . <br /> <br />TO: <br />FROM: <br />RE: <br />DATE: <br />PRESENT: <br /> <br />F~R 1 3 '89 <br />QOWt\AUO WATER <br />CONSERVATION <br />!:Inllan <br /> <br />File <br />Ron Rossmiller <br />Union Avenue Boat Chute Model <br />February 8, 1989 <br />Cliff Pugh, Jerry Fitzwater, Cassie Klumpp of USBR <br />Bob Ferguson, Gary Lacy, Ron Rossmiller of WWE <br /> <br />The six of us met at the USBR Lab to observe the two changes to the model developed <br />by USBR personnel. Change No. I consisted of a line of rocks placeCl on the chute at <br />the existing USACE dam crest. Change No. Z consisted of a two-step sill placed in <br />the low flow notch of the chute. <br /> <br />CHANGE NO. I <br />The line of rocks was placed downstream of the rocks which reduce the width of the <br />chute from 3Z feet to ZO feet and on the river side of the chute, away from the wall <br />downstream of the radial oate. The line of rocks extended downstream until the top <br />of the last rock was below the maximum tailwater elevation for boating flows. <br /> <br />The purpose of this line of rocks proposed by the USBR personnel was to create a <br />current towards the west (left) bank and to reduce the tendency for boats to veer <br />off to the right and sometimes glance off the inner wall of the rectangular concrete <br />channel downstream of the radial gate. <br /> <br />Change No. I was tested through 8 range of flows from 100 cfs to 800 cfs. At the <br />lower flow rates there was an Improvement from the previous tweakings to the <br />chute itself. A definite current towards the west bank was observed. The improve- <br />ment was less at the higher flow rates. <br /> <br />An occasional boat still veered to the rioht throughout the entire range of flows. <br />This occurred when a boat entered the chute towards the right side of the chute. <br />