Designing A Drip Irrigation System

[jsurpless]

@emil

@jsurpless, good detail to note. Are the two rings the same diameter or is one larger or smaller than the other? i.e. Does it look like a Target logo? (with the tree being the center circle) and two 24" diameter rings?

Or the shooting target below with the tree also the center circle)?

It’s more like the Target logo

@emil

I calculate your precip rate as follows:

PR = (96.25(A*B))/(C)

96.25 = constant that converts gallons per minute (GPM) to inches per hour. It is derived from 60 minutes per hour divided by 7.48 gallons per cubic foot. times 12 inches per foot. A = #heads -or- #emitters B = flow rate (GPM) per head -or- emitter C = zone square footage

A = 2B = 0.9 GPH = 0.015 GPMC = 4 (given 24" diameter rings x 2)

PR = (96.25(2*0.015))/(4) = 0.721875 = 0.722 in/hr

I use 4 for the square footage since each emitter is spaced 12" in-line with the Netafim drip tube. Since drip tube is a source point application and not watering the entire area it’s covering, square footage measurements should be considered more of a perimeter calculation.

I don’t quite follow this - if I have 2x 24" diameter rings, wouldn’t the perimeter of each ring be ~3.14159 * 24" = 75.4"?

So that would mean that I have about 6 emitters per ring, right?