Showing papers on "Spillway published in 1969"

Fluctuating Pressure in Spillway Stilling Basins

Abstract: Experimental data is presented on fluctuating pressures in models of spillway stilling basins. Of special interest are data on (1) Variation of pressure fluctuations with location in the basin, (2) variation of fluctuations with discharge, and (3) the growth of a pressure pulse as flow passes through the upstream portion of the hydraulic jump. Pressure fluctuations up to plus or minus 40% of the incident-velocity head were measured during the tests.

Three-Dimensional Analogue used for Relief well Design in the Mangla Dam Project

Abstract: Synopsis An unusual problem arose during the design of a relief well system to control piezometric pressures in the vicinity of the main spillway of the Mangla Dam. Seepage in a 55 ft thick sandstone bed, sandwiched between clay beds, had to be intercepted by a line of 20 in. diameter drainage wells in which the water levels were maintained very low by pumping. The effective water level in each well was thus given by the intersection of the clay bed forming the lower boundary of the sandstone. These effective water levels were different for each well because of the dip. Seepage, fully confined remote from the wells, becomes unconfined in their vicinity. A further complicating feature is the strong anisotropy of the permeable sandstone. A three-dimensional resistance network analogue was used to determine the well spacing required. Un probleme inaccoutume se presenta au cours de la conception d'un systeme de puits de decharge pour controler les pressions piezometriques dans le voisinage du deversoir princi...

Scour at the base of spillway buckets.

Abstract: ACKNOWLEDGEMENTS TABLE OF CONTENTS LIST OF FIGURES LIST OF TABLES NOMENCLATURE

Kaskaskia River Navigation Project, Illinois; Hydraulic Model Investigation.

Abstract: : The proposed Kaskaskia River navigation project will provide a 50-mile-long, 9-ft-deep by 200-ft-wide channel from the mouth of the river to Fayetteville, Ill., by means of channel enlargement and realignment; alterations to bridges to obtain proper clearance; and construction of a gated dam surmounted by two 60- by 30-ft tainter gates, and an 84- by 600-ft navigation lock. A 1:120-scale, fixed-bed model, reproducing 2.0 miles of the Kaskaskia River and 1.8 miles of the Mississippi River, was used to: demonstrate and study flow conditions in lock approaches and in critical reaches; determine adequacy of proposed design for the spillway, stilling basin, and exit channel; determine optimum arrangement of the guide or guard walls; determine areas requiring special protection and navigation conditions in lock approaches and in critical reaches; and develop modifications required to produce satisfactory flow and navigation conditions.

Navigation Conditions at Lock and Dam No. 7, Arkansas River; Hydraulic Model Investigation.

Abstract: : Lock and Dam No. 7 will consist of a 110- by 600-ft lock on the right bank and a 980-ft-long, nonnavigable dam of 14 gated spillway bays. A 1:120-scale, semifixed-bed model, reproducing about 7 miles of the Arkansas River, adjacent overbank areas, the lock and dam, and other structures that might affect flow conditions, was used to study navigation conditions in the lock approaches, the design of the upstream guard wall, and the location and design of any training works needed to improve navigation conditions and distribution of flow through the spillway and along the overbank. A self-propelled model towboat and tow were used to study current effects on navigation passing through the locks and through the proposed I-430 Bridge to be located about a mile upstream of the lock and dam.