Dwerige weir is a concrete hydraulic structure construct as flooding protect and water harvesting system for replenishment ground water in the area. The foundation comprised of highly erodible alluvial fan deposits. SEEP/W used to analysis foundation soil stability against piping erosion resulting from the water seeps. The two dimensions steady state model are selected, and saturated only materials used in the analysis. The results show that the soil need more actions to support the foundation during the weir economic life.
The steady state seepage analysis is used to compute the factor of safety against piping for Teeb weir in the eastern part of Maysn. Teeb weir is a one of a swarm of hydraulic structures that were suggested and designed to reduce flooding risk in the Teeb area, and to work as a water harvesting system to recharge ground water in the area. The geotechnical engineering map is drawn to analysis the soil properties and estimate the suitability of the soil to support foundation of the weir body and downstream reservoir. SEEP/W software is used to solve the water seepage model underneath the weir foundation. Only the saturated model is selected to compute the factor of safety against vertical piping and to denote the zone of potential piping erosion. The model results show that the stability is critical and that there is a high possibility of failure expected, especially in the downstream zone.
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