Appendix L3. SAMPLE WATER EFFICIENT LANDSCAPE WORKSHEET

This worksheet is filled out by the project applicant and is a required element of the Landscape Documentation Package.

Reference Evapotranspiration (ETo) 43.5

Landscape Areas
Hydrozone	Plant Water Use Type(s)	Plant Factor (PF)*	Irrigation Method	Irrigation Efficiency	ETAF (PF/IE)	Hydrozone Area (HA) (square feet)	ETAF × Area	Estimated Total Water Use (ETWU)
					Totals	(A)	(B)

 

 

Special Landscape Areas
Hydrozone	Plant Water Use Type(s)	Plant Factor (PF)*	Irrigation Method	Irrigation Efficiency	ETAF (PF/IE)	Hydrozone Area (HA) (square feet)	ETAF × Area	Estimated Total Water Use (ETWU)
					1.0
					1.0
					1.0
					Totals	(C)	(D)
			ETWU Total
			Maximum Allowed Water Allowance (MAWA)

 

Water Budget Calculations

New or altered landscaping shall not exceed the Maximum Applied Water Allowance (MAWA). The following MAWA calculation shall be used to identify the annual allowance of water needed for a landscaped area:

Maximum Applied Water Allowance (MAWA)

The project's Maximum Applied Water Allowance (MAWA) shall be calculated using these equation:

 

MAWA	=	(ETo) (0.62) [(ETAF × LA) + ((1-ETAF) × SLA)]
where:
MAWA	=	Maximum Applied Water Allowance (gallons per year)
ETo	=	Reference Evapotranspiration from Appendix L1 (inches per year)
ETAF	=	Average Evapotranspiration (ET) Adjustment Factor (ETAF) is the Plant Factor (PF) divided by the Irrigation Efficiency (IE). For residential the average ETAF must be 0.55 or below and for non-residential areas must be 0.45 or below.
PF	=	Plant Factor used shall be from Water Use Classifications of Landscape Species (WUCOLS). Plant factors may also be obtained from horticultural researchers with academic institutions or nursery industry professional associations as approved by the California Department of Water Resources (DWR).
IE	=	Irrigation Efficiency (minimum allowed 0.75 for overhead spray devices and 0.81 for drip system)
LA	=	Landscaped Area includes Special Landscape Area (square feet)
0.62	=	Conversion factor (to gallons per square foot)
SLA	=	Recreational areas, areas devoted to edible plants such as orchards and vegetable gardens and areas irrigated with recycled water (square feet).
<1.0	=	Evapotranspiration Adjustment Factor for Special Landscape Area shall not exceed 1.0

 

(Ord. No. 4492, § 9, 6-21-2016)