Time of concentration in torrential catchments in Serbia

Maximal discharge Qmax,p is the basic input data for the design of longitudinal and transversal objects in torrential beds. Calculation of maximal discharge Qmax, on unstudied catchments is performed by the following methods: combined procedure (the theory of synthetic unit hydrograph and SCS methodology for the separation of effective rainfall Pe from total rainfall Pb), rational theory and theory of maximal runoff intensity. Rational theory is a suitable method with representative time of concentration Tc. The time of concentration was determined on the basis of investigation on 93 control profiles, south from the Sava and the Danube. Time of concentration and dominant physical-geography characteristics of the catchments were the basis for deriving the equations with regional significance [Tc=f(A), Tc=f(L), Tc=f(L, Lc, Iu), Tc=f(L, Iu), Tc=f(L, Isr), Tc=f(L, Iu, Isr)]. The relation between time of concentration Tc and lag time tp was determined [Tc=f(tp)].

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