![]() Studio Express Groundwater calculates retention pond recovery times in aquifers like this. Looking to calculate the recovery times or mounding analysis (unsaturated and saturated) for retention ponds in shallow sandy aquifers? Check out Studio Express Groundwater feature. Retention Pond Recovery in Shallow Aquifers In the example below, it shows that the WQv fills the pond up to elevation 102.5 and it takes around 15.4 hours to completely drain. ![]() Drain Time plot will reveal the elevation in the pond that represents that volume as well as its time to drain. Just make adjustments to your outlet devices until the desired drain time is achieved.įor example, if you have chosen to include a water Quality Volume (WQv) in Step 1, the Stage vs. This chart provides an excellent visual guide as shown below. Read the water level depth from the graduated tape when the electronic meter sounds a solid tone. Drain Time plot is available at Step 3 – Add Outlets in the Pond Designer. Insert the probe of the electronic water level into the well when the pump is at rest. That procedure has the advantage that the well flow rate recorded is not affected by other problems such as a piping error or clogged water pipes or a defective well pump or water pressure tank. in the pond that represents that volume as well as its time to drain. A true well flow test, well recovery test, or well draw-down test requires special equipment and locating, opening, and pumping right at the well. Once the outflow in the pond gets below 0.01 cfs, the drain time calculations stop and it is assumed the pond is, for all practical purposes, empty. Hydrology Studio automatically computes drawdown times for each pond and tabulates. Hydrology Studio computes time to empty until the flow, Qave, reaches 0.01 cfs. Qave = average outflow from Stage n to Stage n-1Īs shown in the table below, it would take 3.49 hours for this particular pond to drawdown from Stage 0.35 feet. ![]() Time = incremental drawdown time from Stage n to Stage n-1ĭStor = change in storage from Stage n to Stage n-1 Drawdown times are computed at each Stage shown on the Output Table where you enter your outlet devices. Hydrology Studio uses the “average head/average discharge” method to compute drawdown time. ![]()
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