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Lock and Dam No. 3 will consist of a 110- by 600-ft lock and a 1260-ft-long, gated, nonnavigable dam. A movable-bed model, reproducing 12.8 miles of the Arkansas River to a horizontal scale of 1:120 and vertical scale of 1:80, was used to determine: suitability of the proposed site for the structures; adequacy of proposed regulating works upstream and downstream including a proposed cutoff; modifications required to provide adequate channel dimensions and safe navigation conditions with minimum maintenance; and effects of various cofferdam and diversion plans. Special studies were also conducted with the model converted to a 1:120 scale (undistorted). Test results indicated that satisfactory navigation conditions can be developed with the lock and dam at the proposed site. Development of channel dimensions was affected considerably by the tendency of the channel to meander within the long, straight reach at the site and the effects of dam gate operation on sediment movement. Regulating structures that provided adequate channel dimensions under typical flow conditions were developed, except in the lower lock approach channel. (Author).
Lock and Dam No. 4 will consist of a 110- by 600-ft lock and a 1190-ft long, gated, nonnavigable dam. A 1:120-scale fixed-bed model, reproducing 5.2 miles of the Arkansas River, was used to: (a) demonstrate flow conditions in lock approaches and in vicinity of Rob Roy Bridge (1.3 miles above lock); (b) determine effect of various guard wall designs on forces affecting tows in upper lock approach; (c) determine optimum location of harbor and dock, and mooring facilities; (d) measure distribution of different flows throughout the model; and (e) furnish information for use in developing modifications of the approaches and structures to improve navigation conditions. Tests were concerned with study of flow patterns, measurement of velocities in lock approaches, and behavior of a model tow on entering and leaving the locks and navigating through Rob Roy Bridge under flows ranging from 100,000 to 350,000 cfs. (Author).