Here is the situation...
I have a new sand filter( Hayward 310t) and a Pentair Whisperflo 1 hp pump.
I had a cartridge filter prior to this( big pain in the rear).
But now I need to backwash this occasionally, problem is that the flow rate
is about 75 gallons per minute from the 2" backwash hose for about 3-4
minutes total cycle time.This is way to much water for my backyard, as it
soaks into the cinderblock fence.( I am in Arizona), and erodes the
landscaping while discharging.
So, I spoke to the city, I can discharge the water into a common area behind
the back wall. I have to be careful about erosion here though as well.
there is 10 foot wide strip of decomposed granite between the wall and the
greenspace. I need to get the water OVER that.
So here was my thought...
Hard plumb 2" PVC from the discharge outlet on the valve( buried) to the
back wall, run the PVC up the wall to the top edge and put in some sort of
spray mechanism. What to use for that....
How about a 2" cap on a 45 degree elbow( so it angles up and away) that has
been drilled with 8 - 1/4 holes or 16 - 1/8 holes . ( I cant believe it
would be that simple to get the same flow rate)
Maybe someone versed in Fluid dynamics can /will clarify... What
combination of holes/diameter would I need to allow the same volume of
water to escape as an open 2" pipe? Perhaps slots rather than holes?
I also thought about using an agricultural sprinkler head( like for golf
courses, but can find one that flows greater than 66.7 GPM.
I have thought about plumbing the discharge to the waste outlet in front of
the house, but the distance is prohibitive, about 150 feet.
Any suggestions greatly appreciated.