Quick answer: Put in the lawn size, the sprinkler type and the watering schedule, and the calculator returns the gallons your irrigation is using weekly and monthly — along with what that costs at Metro Water Services rates. Free quotes: (615) 334-9088.
Sprinkler use tends to go unnoticed until a bill arrives that is larger than expected. Feed the lawn size and schedule in here and the weekly and monthly irrigation volume comes back, which is what lets watering be sized properly for the fescue and warm-season lawns of Middle Tennessee and the Metro Water bill brought down. Worth bookmarking and re-running whenever the controller changes.
Write down measured irrigation zones and controller inputs before selecting a service path
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var d=parseFloat(document.getElementById(‘id’).value)||0;
var rate=parseFloat(document.getElementById(‘ir’).value)||0;
var inchesPerSession=pr*(m/60);
var galPerSession=a*inchesPerSession*0.623;
var perWeek=galPerSession*d;
var perMonth=perWeek*4.33;
var cost=(perMonth/1000)*rate;
var out=document.getElementById(‘iout’);
if(a<=0||d<=0){ out.innerHTML='Enter area and a watering schedule.‘; return; }
out.innerHTML=’Applies about ‘+inchesPerSession.toFixed(2)+’ in per watering.
‘+Math.round(perWeek).toLocaleString()+’ gallons/week | ‘+Math.round(perMonth).toLocaleString()+’ gallons/month
Estimated water cost: $’+cost.toFixed(2)+’/month (at your entered rate)‘;
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Written sequence 2 for Water-System Scope — Key details
The calculator multiplies your irrigated area by the inches of water applied per session (sprinkler precipitation rate × run time) and converts to gallons (1 inch over 1 square foot is about 0.623 gallons). Spray heads apply water fast (~1.5 in/hr), rotors slower (~0.5 in/hr), and drip slowest — so drip zones run longer but use far less overall. Adjust the rate field to your Metro Water Services rate for a closer cost.
Written sequence 4 for Water-System Scope — Water-System Observations
Middle Tennessee gets decent summer rainfall, so lawns often need only supplemental water — about 1 inch per week including rain, up to 1.5 inches in a dry spell. Cool-season tall fescue is thirstier in summer heat than warm-season Bermuda or Zoysia. Water deeply once or twice a week rather than daily, early in the morning to reduce evaporation and the fungal disease our humidity encourages. A rain sensor or smart controller pays for itself by skipping cycles after storms.
Frequently Asked Questions
How much water does a Nashville lawn need per week?
About 1 inch per week including rainfall, up to 1.5 inches during dry spells, in one or two deep waterings. Fescue needs more attention in summer heat than warm-season grasses.
Why is my summer water bill high?
Spray systems apply a lot of water quickly and daily watering adds up. The calculator shows monthly gallons so you can see the effect of an extra day or longer run time and cut back.
Should I water if it rained?
No — skip cycles after rain. A rain sensor automates this. Overwatering wastes money and invites fungus in our humid climate.
Written sequence 5 for Water-System Scope — Water-System Observations
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