On Sun, 11 Feb 2018 00:12:55 -0800, stuart noble wrote:

On Saturday, February 10, 2018 at 8:28:39 PM UTC, Roger Mills wrote:

====snip====

Flow rate is as important as - if not more important than - static
pressure. The OP needs to measure the flow rate at the cold tap which
is nearest to where the mains enters the house. You can do that with a
bucket and a stop-watch.

Zero your bathroom scales with an empty bucket on them. Then hold the
bucket under the full flow of the tap for 27 seconds. Then weigh the
bucket again, so as to weigh the water you collected. The weight in
pounds is the same as the flow rate in litres per minute.
--
Cheers,
Roger ____________
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Pounds/litres? Doesn't sound right

Simples! A litre of water weighs 2.2 Lbs exactly. 60/27=22.22222 which
is a close enough approximation that the number of Lbs of water collected
in 27 seconds directly equates to a litres per minute flow rate.

You could, of course, collect a minute's worth of water (assuming a big
enough bucket) and weigh the amount collected in Kg to calculate a Litres
per minute flow rate. Alternatively, you could use a half or quarter
minute filling time if you don't have a big enough bucket to catch all of
the water flow and multiply up by two or four to calculate the per minute
flow rate.

Of course, if you have to use a shorter filling time for want of a large
enough bucket to cope with a high flow rate, you might as well use a 15
second fill time and multiply the weight in Kg (or the volume in litres)
by the required factor of four to get the Litres per minute flow rate
figure.

Alternatively, you could simply time how long it takes to fill a
collecting vessel of known capacity and translate your figures into a
litres per minute figure using whatever units of measurement are
convenient (fluid ounces, Lbs, gallons/cubic feet[1] or WHY).

Once you're into "Calculator Territory", you may as well knock yourself
out and calculate gallons or cubic feet per minute or litres per second
figures as well as the more common litre per minute figure. :-)

[1] A gallon of water weighs 10Lbs which is also a cubic foot of water.

--
Johnny B Good