(Hw, rw) is almost always available in a pump test. Instead of the pairs (h1, r1) and (h2, r2) we can use (hw, rw) and (H, R).If we know the five we can calculate the 6th There are 6 variables (Q, K, h1, h2 r1, r2). (3) Assessment of the hydraulic conductivity (K) of the aquifer. (3) Find the influence radius (R) for a specific pumping supply. (2) Find the humidity of the aquifer for a specific pumping supply. (1) Find the flow Q for a given aquifer level humidity (h1, h2). The detailed relation that described the constant flow for the case of pumping from an aquifer is: Pumping from unconfined aquifersįor continuous pumping with Q flow, the aquifer was stabilized (steady flow conditions). Give an estimate of the impact radius and plot the level drop curve. Water was pumped from a rarely used well for 5 h and the aquifer level at the well fell by sw = 1 m. The aquifer consists of layers of muddy sand with K = 20 m / day (2,315 ∙ 10-4 m / s). However, the input flow to the R-cylinder around the well is equal to the pumped flow since although the specific flow is almost zero at the cylinder circumference, the peripheral surface it contributes is very large.Įmpirical estimation of radius of influenceĮxercise: Let be a surface well aquifer 15m thick with an underlying impermeable limestone layer 5m thick. Note At a distance equal to the radius of influence the hydraulic inclination dh / dl is almost zero. Rradius of influence is the distance R from the center of the well beyond which the drop of the hydraulic height due to pumping is negligible (practically zero). Η: initial hydraulic head (of aquifer when no pumping). The parameters used to calculate the flow ratio are also given schematically. ![]() The figure below shows the drop curve of the hydraulic height due to pumping from an aquifer. Calibrating the model of a water distribution network EPANET Software – Modeling water supply networks. Advantages of groundwater vs surface water Groundwater Pumping – Flow calculation equations Porosity – Hydraulic conductivity – Specific Yield ![]() Dam failures – Mechanisms and examples of well-known dam failures Diversion of rivers and other temporary dam construction works
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