The figures in the fifth column are added up to show the amount of water used each day. Use this Worksheet to calculate your own home. The family will buy a model using 35 gal. Use this Worksheet to calculate your own home. Shaded lawn areas will have reduced water requirements.
Soil type can also affect water demand.
If no lawn is present and there is a maintained landscape, use water requirements provided by the nursery or landscape designer. This method will give a general indication of water demand only. Note that watering rates will vary during the year, with most watering occurring in the summer. This gives the cubic feet of water demand per year. The remainder is the amount of additional irrigation water the lawn will require.