Hyetographs & Hydrographs. Objectives. Understand what a hyetograph represents Understand what a hydrograph represents Understand what a unit hydrograph represents Know how unit hydrographs can be used to develop various hydrographs. Hyetograph.
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Area IA-Pacific Northwest
Area II-Most of the US
Area III-Gulf & Eastern Coast
a) Find the 2-hour unit hydrograph peak discharge.
b) What would be the peak runoff and design flood volume if a 2-hour storm dropped 2.5 inches of net precipitation?
Area calculated is apparently for the unit hydrograph (not the 5.5” hydrograph). Therefore they should have divided by 1” (instead of 5.5”). Answer should be approx. 42 acres.