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<br />.---- <br /> <br />Hydraul ics <br /> <br />Hydraulic analysis for both the San Juan River main stem segment and <br /> <br />McCabe Creek Segment of the study were based on the SCS Water Surface <br /> <br />profile program, WSP-2. <br /> <br />Necessary data includes flood plain cross section information, reach <br /> <br />lengths, channel and flood plain roughness coefficients, contributing <br /> <br />drainage area, and discharge. <br /> <br />Much of the necessary information came from topographic maps, scale <br /> <br />inch equals 200 feet with 2 foot contour intervals. The maps were <br /> <br />prepared under contract which included digitized cross section data at <br /> <br />specified locations. Bridge information was obtained by separate field <br /> <br />surveys. <br /> <br />Reach lengths and contributing drainage areas were measured from available <br /> <br />maps. Channel and flood plain roughness coefficients were determined <br /> <br />from field inspection and photographs, <br /> <br />Discharge values necessary for the routings were determined from analysing <br /> <br />streamgage records for the San Juan River Segment. This has been previously <br /> <br />discussed. Estimated flow rates in terms of cubic feet per second per <br /> <br />square mile (CSM) were used for the McCabe Creek segment of the study. <br /> <br />This segment required further analysis through the use of SCS TR-20 <br /> <br />programs discussed under the Hydrology section of this report. <br /> <br />- ~~ <br /> <br />" <br /> <br /> <br />L.-_ <br />II. <br />~ <br /> <br />- <br /> <br />~ <br /> <br /> <br />~ <br />~ <br /> <br /> <br />:..- ..~ <br />. " <br />, , <br /> <br />"-.... <br /> <br />- <br />r <br /> <br />i <br />