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<br />O~1627 <br /> <br />CORPS OF ENGINEERS - u.. S. ARMY <br />SOUTHWESTERN DIVISION <br />DALIA;:;, TEXAS <br /> <br />OUTLINE OF PROCEDURE FOR DETERMINATION OF <br />ARKANSAS RIVER BASIN DRAINAGE AREAS <br /> <br />1. Establishment of watsrshed boundaries. <br /> <br />a. Available U.S.G.S. quadrangle sheets were used to locate boundaries. <br /> <br />b. County maps were used for areas not covered by quadrangle sheets. <br /> <br />c. Watershed boundary lines were traced on the quadrangle sheets as in- <br />dicated by contour elevations. <br /> <br />d. Watershed boundary lines were traced on the county maps midway be- <br />tween streame. <br /> <br />2 . Breakdown of Areas. <br /> <br />Watershede were determined, as indicated in par88=Pp. 1 above, <br />for the main stem on the Arkansas River, from source near <br />Leadville, Colorado, to lIIDllth at Mississippi River for lIBJor <br />and minor tributaries and their tributaries or eubareas and <br />for dam sites, gaging stations, etc. <br /> <br />3. Determination of Drainage Areas (Source to Fort Smith, Arkansas) <br /> <br />a. Quadrilaterals (basic areas) of 30 minutes latitude and longitude <br />were plotted on base I!Il.pS (scale = 1:500,000) of entire drainage <br />area under study. EaOh quadrilateral was numbered. <br /> <br />b. Drainage boundaries established as indicated in par&sraPh 2 above <br />were transferred to the base maps through the use of a pantograph; <br /> <br />c. Each basic area (30 minute quadrilateral) on the base I!Il.p was <br />pl.an:lmetered. <br /> <br />d. l'lan:lme1;ered that portion of drainage area in question that laJ <br />in a given basic area. <br /> <br />e. Determined the percent (to nearest l/lOOth of one percent) that <br />the area in question was of the basic area, (d/c). <br /> <br />f. Total number of square miles in basic area (as determined fram <br />Smithsonian Geographic Tables) was DDlltiplied by percentage de- <br />termined in e, above, to determine number square miles in that <br />drainage area in queetion. <br /> <br />. <br /> <br />A <br /> <br />.. I <br /> <br />,- <br />