Laserfiche WebLink
<br />Table 1. Comparisons of manual measurements and geographic-information-system-procedure <br />measurements of selected drainage-basin characteristics at sdected streamflow-gaging stations <br />[TDA, total drainage area, in square miles; BP, basin perimeter, in miles; BR, basin relief, in feet; <br />FOS, number of first-order streams; TTF, 2-year, 24-hour precipitation intensity, in inches; MAN, <br />manual measurement; GIS, geographic-information-system procedure; % DIFF, percentage difference <br /> between MAN and GIS] <br /> Measure- Selected drainage-basin characteristics <br />Station ment <br />number technique TDA1 BP BR FOS TTF <br />05411600 MAN 177 73.3 297 84 3.05 <br /> GIS 178 73.9 274 84 3.05 <br /> % DIFF +0.6 +0.8 -7.7 0 0 <br />05414450 MAN 21.6 21.9 444 10 3.05 <br /> GIS 22.3 21.3 394 10 3.05 <br /> % DIFF +3.2 -2.7 -11.3 0 0 <br />05414600 MAN 1.54 5.32 280 1 3.05 <br /> GIS 1.53 5.97 291 1 3.05 <br /> % DIFF -0.6 +12.2 +3.9 0 0 <br />05462750 MAN 11.6 15.0 160 6 3.05 <br /> GIS 11.9 15.5 129 6 3.05 <br /> % DIFF +2.6 +3.3 -19.4 0 0 <br />05463090 MAN 56.9 33.5 181 28 3.15 <br /> GIS 57.0 33.1 160 28 3.15 <br /> % DIFF +0.2 -1.2 -11.6 0 0 <br />05470500 MAN 204 69.8 318 60 3.15 <br /> GIS 208 67.7 292 51 3.15 <br /> % DIFF +2.0 -3.0 -8.2 -15.0 0 <br />05481000 MAN 844 139 303 152 3.05 <br /> GIS 852 139 300 155 3.05 <br /> % DIFF +0.9 0 -1.0 +2.0 0 <br />05489490 MAN 22.9 24.8 280 10 3.25 <br /> GIS 22.2 26.2 263 10 3.25 <br /> % DIFF -3.1 +5.6 -6.1 0 0 <br />06483430 MAN 29.9 28.8 198 12 2.85 <br /> GIS 30.0 28.9 182 12 2.85 <br /> % DIFF +0.3 +0.3 -8.1 0 0 <br />06609500 MAN 871 206 582 477 3.05 <br /> GIS 869 210 550 475 3.05 <br /> % DIFF -0.2 +1.9 -5.5 -0.4 0 <br /> <br />14 ESTIMATING DESIGN-FLOOD DISCHARGES FOR STREAMS IN IOWA <br />