摘要：Because of the low water levels on Sf. Gheorghe channel and from the Razelm-Sinoe hydrotechnical complex, as well as because of the phenomenon of the Black Sea waters continuous raising, overlapped with the storm periods, there is the risk of producing seashore erosion and consequently of salty water getting into the Razelm-Sinoe hydrotechnical complex, causing the ecosystem ecological equilibrium breakage. The present paper aims to analyse the complex phenomena producing in the Danube Delta and especially in the Razelm-Sinoe hydrotechnical complex, in the context of some critical flows sampling to agriculture, so that to protect the Razelm-Sinoe ecosystem. In this respect, in order to solve the research theme, a Soil . Water . Balance numerical computation model was proposed; with its help, the phenomenon of drought in the area was analised, but it was especially used to analyse the possibilities of sampling the irrigation water, so that the hydraulics and ecological equilibrium of the Razelm-Sinoe ecosystem not to be affected. The computation numerical model was adjusted to the concrete conditions of the area taken into study, by establishing the soil and studied crops characteristics, by creep of the cultural coefficients for different vegetative stages, of the productive answer coefficient for different irrigation norms and establishing the hydraulics working regime of this assembly of hydrotechnical works
关键词：hydrological balance; drought; cultural coefficient; evapo-transpiration; hydraulics regime; irrigation norm
