Our Lawn Watering rates are based on applying 1 inch of water per sq ft. To find your water volume needs you can multiply Length x Width X 0.623 and that will give you the amount of water required to equal a 1 inch rainfall.
Try this Link to find out how much water you need. http://water.usgs.gov/edu/activity-howmuchrain.html
Give us a call with the sq ft you need to water and we can give you a quote! 847-652-7640
Aloha!