This study also has incorporated a portion of the rainwater usage in the urban landscaping and gardening. Evapotranspiration is the process responsible to remove water from fields, including evaporation from the soil and transpiration from plants. Since all urban households in this study have a portion for urban landscaping, the computation process of the outdoor water demand involves the landscape evapotranspiration value. A single series of monthly evaporation values at the study sites is
used to calculate landscape evapotranspiration. The potential changes in the evaporation values in the future are not reflected upon the landscape evapotranspiration values.