Ladjel, M.2020-10-222020-10-222016-01-01Articale in Journal of fundamental and Applied Sciences Vol. 08, N. 011112-9867http://dspace.univ-eloued.dz/handle/123456789/7265Articale in Journal of fundamental and Applied Sciences Vol. 08, N. 01The catastrophic floods in semi-arid areas are often caused by floods storm that occur at any time during the year, including the hot season. The prevention of these floods could be done by the construction of small dam hills. This requires the control of theoretical concepts hydrological sizing, especially the hydrological structure to evacuate floods. We suggest a method to calculate the optimal regulation flow of the flood and also the development of a direct calculation formula of a laminated maximum flow. The analysis of the hydro graph’s analogy at the input and the output of the dam, allow searching the dependencies between their characteristics. Knowing the characteristics of the hydrograph flood of the project and the reserved capacity for the amortization of the flood, we can directly determine the laminated maximum flow and project the hydrograph of the laminated flood.frmaximum flow; lamination; dam; flood; hydrograph; laminated flow.Article