In order to accurately calculate an outdoor water budget, EVWD utilized high resolution aerial images and specialized Geographic Information System (GIS) software to measure the irrigated area of every property in the service area. The aerial photography process is very similar to technology used for Google Earth.
The second component to calculating outdoor allocations is measuring the weather. Multiple weather stations in the area would be used to gather Evapotranspiration (ETo) rates to determine how much water is needed to efficiently water a yard.
As with indoor budgets, should a water emergency situation occur, the District could implement a drought factor to reduce outdoor water allocations if necessary.
Outdoor budgets are typically calculated using the size of the individualized irrigated area, the ETo and days of service.