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estimates of watershed average rainfall
for period March 1920 through December 1929 U 13
5 other sections not shown
alluvial fans antecedent moisture average base flow bridge opening c+ H channel chap Compute contour CREEK Critical depth cross section Determine developed direct runoff drainage area embankment ENGINEERING HANDBOOK SECTION equation error evaluation Example lU-8 feet flood plain forest given graph head loss humus hydrologic condition HYDROLOGIC SOIL GROUP hydrologic soil-cover complexes hydrologic unit hydrologist HYDROLOGY CHAPTER inches increments INDICATES THE SOIL inflow hydrograph inlet control isohyetal legumes method NATIONAL ENGINEERING HANDBOOK nomograph outflow hydrograph outlet control peak rate percent plotted reach length relationship reservoir routing Row crop runoff curve numbers SECTION k HYDROLOGY shown in Figure slope snowmelt SOIL GROUP INDICATES spillway square miles stage discharge curve step storage storm rainfall stream streamflow surface runoff Table tabulate in column terraces tion treatment U.S. Forest Service unit hydrograph upstream values velocity head versus area inundated watershed width