This study include the description of the old and modern Marib Dame, and the comparative between the situation of these dams from the view of the Precipitation in the basins, periode rate of the inundation flows in the basine functions of these, Geologic of the zone and topgraphy of it and shown the deference between them. Reaching of the aspect aim in the space of cultural development in Yemen Purpose of the study That Study aims to observe how the irrigation system on the banks of the valleys by the Yemenis have also been used by their ancestors, as well as irrigation followed on different valleys of this country with complex terrain valleys systems. Also it aims to study the geological reality of the region of Marib and the dam area in particular, as well as the study of the valley, which was held by the dam geology and hydrology with the most important findings of the study of water in that important region of Yemen and the reasons for the depletion of groundwater.