What does the ETWU formula estimate?

The ETWU formula, which stands for Estimated Total Water Use, is specifically designed to estimate the overall water usage for a landscape area over a given time period, typically on an annual basis. Its purpose is to provide landscape architects, planners, and irrigation specialists with a systematic approach to calculating the total water that will be needed for both irrigation and maintenance of the landscape. This involves considering factors such as plant types, climate, and the specific water requirements of those plants.

By using the ETWU formula, professionals can gain insights into the long-term water demands of a site, which is essential for sustainable landscape design and management. This estimation aids in the planning of irrigation systems and makes it possible to evaluate the overall efficiency and effectiveness of water usage in a given landscape. Therefore, estimating the total water use per year is the primary focus of the ETWU formula.