||Investigation of Time Parameter of Watersheds.
Ch, Shu Tung ;
Lytl, William F. ;
||South Dakota State Univ., Brookings. Water Resources Inst.
||OWRR-A-023-SDAK; 14918,; A-023-SDAK(1)
( Watersheds ;
Surface water runoff) ;
South Dakota ;
Correlation techniques ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
The base width of instantaneous unit hydrograph -- the time of base for thrity-five watersheds in South Dakota is investigated. This time parameter is correlated with the measurable physical properties of watersheds. A formula equation was derived which correlates the peak runoff and the duration of rainfall excess for a variable rainfall excess pattern. This formula augments theoretical developments in applying the ideas of unit hydrography theory and time of base to analyze runoff data. Based upon this correlation, a new method is developed to determine the flood discharge for ungaged watersheds with area less than 500 sq. miles in South Dakota. (Author)