I recently had surface dripline run along the strips in my backyard and I was trying to calculate the inches per hour. The number I come up with seems a bit low, so I thought I’d post my calculations and see if anyone sees an error.

Much of the strip is about 3’ wide and has 2 driplines running down it spaced 1’ apart. I realize this may not be ideal, the space between the 2 lines will get more water than the space outside the 2, but that’s the way they got laid out by the landscaper. The line has 1/2 g/hr emitters spaced every 12". So if I think about a 10’ length it will have 20 emitters giving 10 g/hr. 10 gallons is 2310 cubic inches. This is spread over an area of 30sq feet, and with 144 in^2 per foot^2 the area is 4320 in^2. Each sq inch gets 2310/4320 = .53" of water per hour.

Does this seem right?