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Major floods have tested the Cross-Vane structure such as the 1996 flood on the San Juan River <br /> in Pagosa Springs, which passed a flood stage of 3.5 meters above the top of the structures on a <br /> 0.005 slope. A detailed contour map prepared in 2000 demonstrates the channel shape and <br /> location of the deep pool(Figure 4). The structure did require post-flood maintenance and it is <br /> still performing properly as a diversion structure,a kayak playground and an excellent fly-fishing <br /> location where fisherman can be frequently observed. Although bedload transport of particle <br /> e during the flood,the pools did not fill. The strong downwelling <br /> size up to 220 mm occurred d g p g <br /> currents in the center of the channel maintained a high bedload transport keeping the pool deep <br /> as evidenced in Figure 4. <br /> Flow <br /> X$. <br /> 00 '4 Ii: .' 6). iir,------ '(r :0'#. " i <br /> i <br /> O 14) Ak‘ , <br /> ,-. - a 4 <br /> ct, 0 U <br /> . 1%.,,,.._ 4111111 ‘Il ♦ r 4 N <br /> 3 •.30 ,± �i �� r,\\PO \ <br /> w i•: 0 <br /> • O r ..p! • <br /> 1 X , O <br /> •00 • <br /> : ' ( <br /> [ \ <br /> •.. <br /> • <br /> 1.Q <br /> 1 <br /> /`i/ X7 X <br /> .1 x Aso >>0 ''O •80 <br /> $ �� x? .. •70 • 30 <br /> •90"9i 80 60 0 <br /> GRAPHIC SCALE <br /> 30 0 15 30 60 120 <br /> • <br /> ( IN FEET ) <br /> 1 inch = 30 ft- <br /> Figure 4. Contour map of Cross-Vane following major flood—San Juan River, CO. <br /> 7 <br />