There are yards that run zones longer because of sandy soils and yards that run shorter due to soils with loamier soils. There are also yards that run zones multiple times a day. On average, throughout the entire season, the numbers used are on the conservative side. We will be staying on the conservative side just to show everyone the minimum amount of time it will take to pay off an irrigation well and pump system.
4 zones X 5 heads = 20 total heads
20 total heads X 2 GPM = 40 GPM
40 GPM X 30 min run time = 1200 gallons per day
The average irrigation season for lawns in Delaware runs from May 1 until Oct 15. That’s 158 days. Most people offload rain delays on their systems. Subtract 13 days for rain delays and you end up irrigating for 145 days.
1200 gallons per day X 145 days = 174,000 gallons of water used for irrigation per season
So How Much Does It Cost to Irrigate 174,000 Gallons of Water a Year?
Every community will be different. Check your water bill to locate and compare it with these numbers.
First is the base rate; the base rate is per quarter, and there are two quarters in an irrigation season.
52.86 X 2 (for 2 quarters) = 105.72
We are going to leave this number out because you have to pay this anyways to supply water to your home. So now we will focus on usage.
8.0493 per 1,000 gallons of water is the charge
In the example, we used 174,000 gallons of water.