Năsal accumulation, taken in the study, ensures through the barrier of the Fizes valley, the fastest and most efficient method of regularizing the outrush flow rates. In addition, it ensures a water glitter for the piscicultural activity.  Through the attenuation of flood waves in these accumulations, both the direct and indirect damages are avoided: the direct damages representing the value of the destructions or damages of the affected objectives and the value of the expenses made with the intervention operations for defending the endangering, evacuation and population help areas; indirect damages given by the losses registered in the economy.  The passage of flood waves through Năsal accumulation leads to their attenuation achieving in the downhill barrage sections much smaller attenuated levels and flow rates than the flood wave ones that lead to the diminishing in a great extent of the potential damages that could be produced in the lack of these works on the water courses. In present paper is to present the results of the simulation with the program used in this application, software Mathcad 14.