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<br />3.1. <br /> <br />3.2. <br /> <br />3.3. <br /> <br />3.4. <br /> <br />3.5. <br /> <br />3.6. <br /> <br />3.7. <br /> <br />3.8. <br /> <br />3.8. <br /> <br />3.9. <br /> <br />3.10. <br /> <br />3.lla. <br /> <br />3.llb. <br /> <br />3.llc. <br /> <br />3.lld. <br /> <br />3.12. <br /> <br />3.n. <br /> <br />Areas of minimum orographic effects in Southwest States. <br /> <br />Schematic of orographic PMP index map development. . <br /> <br />A first approximation to the orographic PMP (inches) for <br />10 mi2 (26 km2) 24 hr in southeast Arizona. . . . <br /> <br />Segments across major ridges in Southwest States used in <br />rain ratio study . . . . . . . . . . . . . . . <br /> <br />Segments across major ridges in Arizona superimposed on <br />analysis of 100-yr 24-hr precipitation (in tenths of an <br /> <br />inch). . . . . . .. ... . . . .. ..... . <br /> <br />Generalized topography and station locator map in vicinity <br />of Workman Creek, Arizona. . . . <br /> <br />Rainfall-elevation relation for August 1951 storm, and rain- <br />fall for September 1970 storm. . . . . . . . . . <br /> <br />Leeward isohyeta1 patterns; a. 100-yr 24-hr rainfall, <br />b. August 1951 storm . . . . . . . . . . . . . . . <br /> <br />Leeward isohyeta1 patterns; c. September 1970 storm. <br /> <br />Leeward rainfalls in percent of ridge value for major storms <br />and 100-yr 24-hr rains .. ............... <br /> <br />Example of profiles of several rainfall indices (in percent <br />of maximum values) . . . . . . . . . . <br /> <br />10-mi2 (26-km2) 24-hr orographic PMP index map (inches), <br />northern section . . . . . . . . . . . . <br />10-mi2 (26-km2) 24-hr orographic PMP index map (inches), <br />north-central section. . . . . . . . . . <br />10-mi2 (26-km2) 24-hr orographic PMP index map (inches), <br />south-central section. . . . . . . . . . <br />10-mi2 (26-km2) 24-hr orographic PMP index map (inches), <br />southern section . . . . . . . . . <br /> <br />Seasonal variation in 10-mi2 (26-km2) 24-hr orographic PMP <br />for the study region (in percent of values in figure 3.11); <br />January, February. . . . . . . . . . . . . . . . . . <br /> <br />Seasonal variation in 10-mi2 (26-km2) 24-hr orographic PMP <br />for the study region (in percent of values in figure 3.11); <br />March, April . . . . . . . .... . . . . . . . . . . <br /> <br />ix <br /> <br />Page <br /> <br />54 <br /> <br />56 <br /> <br />57 <br /> <br />59 <br /> <br />60 <br /> <br />62 <br /> <br />63 <br /> <br />64 <br /> <br />65 <br /> <br />66 <br /> <br />67 <br /> <br />71 <br /> <br />73 <br /> <br />75 <br /> <br />77 <br /> <br />81 <br /> <br />82 <br />