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<br />EXPERIMENTAL EQUIPMENT <br /> <br />Flumes <br /> <br />Two flumes were used for the two-dimensional studies. The initial <br /> <br />studies were conducted in a tilting flume with a movable bed. The flull'e <br /> <br />was 60 ft long, 2 ft wide and 2.5 ft deep. The side walls were clear plexi- <br /> <br />glass which facilitated observations. Both water and sediment were <br /> <br />recirculated through a 12 inch centrifugal pump. Discharge was controlled <br /> <br />by a gate valve and measured by a calibrated orifice in the discharge line. <br /> <br />The water level in the flume (downstream from the structure) was controlled <br /> <br />by a slotted gate at the downstream end. A schematic diagram of the eCJ.1l1p- <br /> <br />ment is shown in Fig. 1. <br /> <br />The second flume used in the suudies was a horizontal rigid bed, <br /> <br />2-ft wide flume, 25 ft long. Only clear water was used for the ~tudies <br /> <br />conducted in this flume. <br /> <br />The 8-ft wide flume used for the studies on lateral water surface <br /> <br />profiles was a recirculating sand and water system. The total flume length <br /> <br />was 180 ft, but only 40 ft of this length was used for the studies. Within <br /> <br />the test length the movement of the sediment bed was restricted by an over- <br /> <br />lay of cheesecloth. In this manner, the location and size of the sand bers <br /> <br />could be better controlled without movement of the bed itself, By restrict- <br /> <br />ing bed movement it was believed to better represent the actual conditions <br /> <br />in the Rio Grande. This will be discussed in more detail in subsequent <br /> <br />sections. <br /> <br />-5- <br /> <br />. 1 (' " ~, <br />L:; ..,' \'J ~-' 0 <br />