(A) Water Efficient Landscape Worksheet required. A project applicant shall submit the Water Efficient Landscape Worksheet, as provided in the Landscape Design Manual, which contains information on the plant factor, irrigation method, irrigation efficiency, and area associated with each hydrozone. Calculations are then made to show that the evapotranspiration adjustment factor (ETAF) for the landscape project does not exceed a factor of 0.55 for residential areas and 0.45 for non-residential areas, exclusive of Special Landscape Areas. The ETAF for a landscape project is based on the plant factors and irrigation methods selected. The Maximum Applied Water Allowance is calculated based on the maximum ETAF allowed and expressed as annual gallons required. The Estimated Total Water Use (ETWU) is calculated based on the plants used and irrigation method selected for the landscape design. The ETWU must be below the MAWA. In calculating the Maximum Applied Water Allowance and Estimated Total Water Use, a project applicant shall use the ETo values from the Reference Evapotranspiration Table contained in the water-efficient landscape packet available from the Community Development Director. Because the city is not covered by the Reference Evapotranspiration Table as provided in the Landscape Design Manual, projects shall use data from other cities located nearby in the same reference evapotranspiration zone, such as the City of Monrovia, as found in the CIMIS Reference Evapotranspiration Zones Map, Department of Water Resources, 1999.
(B) Water budget calculations. Water budget calculations shall adhere to the following requirements:
(1) The plant factor used shall be from the Water Use Classification of Landscape Species (WUCOLS) or from horticultural researchers with academic institutions or professional associations as approved by the California Department of Water Resources (DWR). The plant factor ranges from 0 to 0.1 for low water use plants, from 0.4 to 0.6 for moderate water use plants and from 0.7 to 1.0 for high water use plants.
(2) All water features shall be included in the high water use hydrozone and temporarily irrigated areas shall be included in the low water use hydrozone.
(3) All Special Landscape Areas shall be identified and their water use calculated as described below.
(4) ET Adjustment Factor for new and existing (non-rehabilitated) Special Landscape Areas shall not exceed 1.0.
(Ord. 1346, passed 5-2-12; Am. Ord. 1379, passed 11-4-15)