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Flow Estimating

Flow Estimating

Flow Estimating

(OP)
My maintenance people are asking for a way to estimate the amount of water they are using while slow flushing hydrants to clear up red water complaints. The hydrant will run at a half-barrel for several hours until the water clears. This isnt hard flushing where we'd use a pitot to estimate flow. This is for a rough estimate to turn in for accounting purposes. It seems like an easy semi-circular weir problem, but I havent found a source with the equations. I found something called the California pipe method that is promising but it needs 6 pipe diameters of pipe upstream of the free-fall discharge. That doesnt apply since its falling directly out of the hydrant nozzle. They also dont have the option of lugging around a hydrant meter to measure this. Does anyone have an equation or suggestion for determining a flow like this out of a hydrant? thanks

RE: Flow Estimating

How about estimating the water velocity from the stream trajectory (projectile motion equations),and the stream area from the measured/known depth at the outlet.  

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