There is an essential need to construct hydraulic structures along any waterway such as weirs, regulators….etc. Regulators are very important parts in the modern irrigation system, but they have some side effects as any other intervention. One of its negative impacts is the rise of the groundwater levels in its surroundings. This increase in water levels, both locally near the new barrage and upstream, will result in changes in groundwater levels in the aquifer system both upstream and downstream of the barrages. A drainage system must be developed to minimize the effect of this problem that is applicable for the Nile valley geology (clay or silt clay overlaying coarse sand).
This study develops design equations, which incorporate the effect of thickness of the top layer and soil parameters on perforated pipes, discharge and spacing between the pipes. These equations are derived for a special case, which consists of two layers, the upper layer being a semi pervious layer of clay or silty clay and the lower aquifer being as coarse sand. A computational model (Micro FEM) has been used to simulate a hypothetical aquifer system for different scenarios. |
