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<br /> <br />EM 1110-2-1601 <br />1 July 70. <br /> <br />. <br /> <br />(; n. Surveillance. A surveillance program should be established for <br />major rip rap bank revetment projects constructed in accordance with criteria <br />furnished herein for the purpose of obtaining data to verify or modify, if nec- <br />essary, the design criteria. Slope gages and discharge measuring facilities <br />should be installed during project construction. Channel discharges, water- <br />surface elevations, general flow conditions, and photographs should be ob- <br />tained for significant flood flows. Riprap revetments should be inspected <br />. after each flood to determine the reasons for and extent of damage, if any. <br />Reports of rip rap revetment damage should be prepared and furnished to the <br />Director, U. S. Army Engineer Waterways Experiment Station, Attn: WESHP, <br />and to Office, Chief of Engineers, A'ttn: ENGCW-EH, following each flood that <br />has resulted in significant revetment damage. The report should contain a <br />description of revetment damage and repairs that were or should be made, <br />reasons for the damages, discharges experienced, and photographs of ri-prap <br />condition. The initial damage report for each project should also contain a <br />brief sununary of hydrologic and hydraulic design data (discharges, frequen- <br />cies, water-surface elevations, energy gradients, velocities, and shear forces). <br />I C:'oeChnical information and specifications pertaining to the revetment design <br />J and construction and selected contract drawings that show the revetment in <br />'I plan and section should also be included. Design memoranda for flood control <br />channel projects should indicate whether or not provisions will be made for <br />Surveillance of riprap revetment. <br />15. Sediment Control Structures. a. General. Two basic types of control <br />structures are used: (1) stabilizers designed to limit channel degradation <br />and (2) drop structures designed to reduce channel slopes to effect nonscour- <br />ing velocities. These structures also correct undesirable, low-water-channel <br />meandering. The general use of grade stabilization structures and their pro- <br />totype performance has be~n presented by Stufft.58 Gildea 59 has discussed <br />ehannel stabilization practice in the LAD. Debris basins and check dams are <br />special types of control structures that are used to trap and store bed-load <br />sediments. <br /> <br />I <br />~ <br /> <br />I <br />, <br />1 <br /> <br />j <br />I <br />. <br />, <br /> <br />47 <br /> <br />.' <br /> <br />',-~-~ <br />