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<br />r~~;~ai~~ge:d~vide digital map digitized <br />i from Waterloo topographic map. <br /> <br />----I <br /> <br />B. Drainage-network digital map extracted <br />from Marshalltown-West digifalline <br />graph data, with stream.order numbers. <br /> <br />~- <br /> <br />j~ <br /> <br />~~ <br /> <br />'--~ <br /> <br />v----__~ <br />J <br />r <br />/---J <br />/ <br /> <br /> <br />~ <br />~- <br /> <br />Base from U.S. Defense Mapping Agency, <br />1 :250,000, 1976 <br />Universal Transverse Mercator projection, <br />Zone 15 <br /> <br />Base from U.S. Geological Survey digital <br />data, 1:100,000, 1984 <br />Universal Transverse Mercator projection, <br />Zone 15 <br /> <br />C. Elevation-contour digital map created from <br />Waterioo-East digital elevation model. <br />sea-level data, with contour intervals <br />at 39.372 feet. <br /> <br />D. Basin-length digital map digitized <br />from Waterloo topographic map. <br /> <br />) C~"~.J~ <br />l "'-J "'~. J<q, \ <br />~J )J-~ _/~,,...) l'::::'J<",,~~ <br />(?:,'- l_, '-J\ ( )." 1: <br />~ ~ 11,102.4161''lr \-~"-) ,u \~ -..984.300 <br />." J~~~J ".--"' <br />o 1 v\, - / / . <br />/)./\//_)}:;~ ( <br /> <br />~~//~ <br /> <br />Base from U.S. Defense Mapping Agency, <br />1 :250.000. 1976 <br />Universal Transverse Mercator projection, <br />Zone 15 <br /> <br />Base from U.S. Defense Mapping Agency, <br />1 :250,000, 1976 <br />Universal Transverse Mercator projection, <br />Zone 15 <br /> <br />o <br />I <br />o <br /> <br />, <br />2.5 <br /> <br />2,5 5 MILES <br />I I <br /> <br />5 KILOMETERS <br /> <br />EXPLANATION <br />.. STREAMFLOW-GAGING STATION <br /> <br />l <br /> <br />I <br /> <br />Figure 4. Four geographic-infDrmation-system maps that constitute a digital representation of selected <br />aspects of a drainage basin. <br /> <br />ESTIMATING DESIGN-FLOOD DISCHARGES USING DRAINAGE-BASfN CHARACTERISTICS II <br />