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How do you compute required pump capacity

How do you compute required pump capacity

How do you compute required pump capacity

(OP)
My previous request was a little misleading.  I would like to determine the required pumping capacity to handle the water created by a flood on an industrial building approximately 5000sf floor area, surrounded by earth with only driveways.  The volumn of water is created by a storm 2 inches per hour.  The soils are a mixture of gravel and clay.  If you need to determine the permeability of the soil, how do you do that?  Thanks for any help with that equation.

RE: How do you compute required pump capacity

Well we will need a lot more data. How long is the storm? No water can escape? Total area of lot? Soil moisture? Total impervious area of lot?

RE: How do you compute required pump capacity

what is volume of retention basin?
what is required time to drain the basin?
what is the acreage of the site?

ask your geotech to run a perc test to get an idea of the percolation rate in your soils

RE: How do you compute required pump capacity

Sites listing Soil Percolation Rates and Percolation Tests is:
http://ianrpubs.unl.edu/wastemgt/g1472.htm
http://www.extension.umn.edu/distribution/naturalresources/DD0583.html

RE: How do you compute required pump capacity

The best solution would be to RAISE your finished floor elevation.  If this is not possible, then consider a pump.  Remember, that the pump is most likely to fail when you need it the most due to a local electric power loss.  Like winds knocking down poles or tree limbs knocking down wires.
The pump will need a an onsite generator backup and a spare cold unit standby, along with operation/maintenance personell.  

As previously stated, much more data is needed to evaluate the pump.  A 2"/hour rainfall event may not be very realistic.  How critical is flood prevention?  Is flood proofing possible?

Clifford H Laubstein
FL PE 58662

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