Design hydrograph determination for flood protection system plays a key role in terms of economy and risk of flooding. The first part of the paper describes the procedure for defining theoretical hydrograph using the “limited runoff intensity” (LRI) method for different probabilities of occurence and the bivariate probability distribution function for determining coincidence of various hydrograph parameters – PROIL model (i.e. maximum anual flow and flood wave volume in the same calendar year). In the second part the criteria for adopting the optimal combination of parameters for defining the (design) theoretical hydrograph depending on the type and purpose of the hydraulic structure, is presented.
The results, theoretical hydrographs for different probabilities occurrence: 0,1, 1,0, 2,0, 5,0 and 10,0%, are presented for the Orљava Hydrological Station at the Danube River in Romania
