Need help with this calculations

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Hi guys
I need some help here, i need to work out how much water will run out of my tank when the there is a power cut, staying on the plaas this happens regally.
What happens when the return pumps stop the water don't, it will carry on running till the level in the tank has drop to below the out let level.
The surface area of the water is:

width - 1020mm
length - 3600mm
i presume the volume of the return pumps will influence the total volume of the tank as well , at this stage it's 8000l/hrs, but this is going to change if we can get some sort of formula to work it out i can do it again when the new pumps are installed.

thanks!
 
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Surface area multiplied by the depth that your inlet/ return and convert to litres. In other words say your return pipe sits 5 cm into the tank (taken from the top of the water level). then it is 1020x3600x50= 180 odd litres.

Thats a nice size tank by the way
 
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my return pipe is going strate down to the bottom of my tank were it pumps into a network of pipe to distribute the water evenly in the tank,
 
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but if i drill 2 hole in my return pipe then the water is going to blast out there when the pumps are running.
 

Mike

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but if i drill 2 hole in my return pipe then the water is going to blast out there when the pumps are running.
Drilling two small holes, just below the water line is fine, water prefers the easier straight through route, but the holes will save your sump overflowing.
 
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OK i get it if the pumps stop the water will flow back in the pipe from were it came from, and the holes in the pipes will prevent that I'll put none return vales in ,but Wat about the water in the tank how many liters is going to ran into my sump,there is noting to stop that it will cheep on over flow till the level has drop to below the out let level.
will it be 1020x3600x? = ?
 

Mekaeel

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OK i get it if the pumps stop the water will flow back in the pipe from were it came from, and the holes in the pipes will prevent that I'll put none return vales in ,but Wat about the water in the tank how many liters is going to ran into my sump,there is noting to stop that it will cheep on over flow till the level has drop to below the out let level.
will it be 1020x3600x? = ?
Ok if the above is in centimeters and the the fail safe is 1 cm below the the water level, you are expecting 367 litres of water to run back to the sump.
 

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