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<br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br /> <br />M E M 0 RAN DUM <br /> <br />To: David Walker <br />From: Wright Water Engineers, Inc. <br />Date: March 3, 1989 <br /> <br />RE: Observation Of Union Avenue Boatchute Model At USBR Hydraulics Lab <br /> <br />The USSR has completed final layout on the boatchute over the existing <br />USACE dam crest as well as the fill material on the dam face. This <br />includes incorporation of the two-stepped sill in the boatchute tested <br />February 8, 1989 by personnel of USSR and WWE and a fillet section along <br />the main dam crest. This will allow for a smooth transition of flow into <br />the derrick stone when flows overtop the main crest. <br /> <br />The boatchute confi gurati on is shown on the attached sketch. Flow tests <br />confirmed its operation. The flow patterns created are concentrated toward <br />the center of the chute in a defined "tongue". The two-stepped sill <br />creates a favorib1e exit condition minimizing the "haystack" formed at the <br />tai1water to less than l-foot over the boating range. The boatchute is <br />symetrica1 and no cross slope is incorporated in the dam fill material. <br />Thi s corrected the tendency for the boats to pull toward the ri ght bank <br />concrete wall. The model boats float strai ght and true into the pool <br />between drops. <br /> <br />The fillet constructed along the dam crest has minimized the keeper wave <br />forming between the crest and first row of derrick stone installed on the <br />dam face. <br /> <br />The taflwater depths have been analyzed over the flow ranges. The 10: 1 <br />slope is transitioned to a 3:1 slope at a higher elevation than initially <br />anticipated. This fact coupled with the omission of cross slope, will tend <br />to save construction materials. <br /> <br />An advantage of this present USSR boatchute configuration is that it works <br />without relying on deflector rocks. <br /> <br />These revisions can be incorporated into the second boatchute downstream <br />for testing. <br /> <br />The USSR's careful and detailed work on the hydraulic model is progressing <br />satisfactorily. Development of solutions to problems by use of the model is <br />advantageous to the project. <br /> <br />(3.18) <br />831-036.08C <br /> <br /> <br /> <br />u <br />2 <br />- <br /> <br />ui <br />II <br />w <br />w <br />2 <br />i5 <br />2 <br />w <br />II <br />w <br />~ <br />~ <br />.. <br />I <br />!2 <br />II <br /> <br />