Appendix B Sample Water Efficient Landscape Worksheet

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

   Reference Evapotranspiration (ETo)

Hydrozone # /Planting Descriptiona	Plant Factor (PF)	Irrigation Methodb	Irrigation Efficiency (IE)c	ETAF (PF/IE)	Landscape Area (sq. ft.)	ETAF x Area	Estimated Total Water Use (ETWU)d
Regular Landscape Areas
				Totals	(A)	(B)
Special Landscape Areas
				1
				1
				1
				Totals	(C)	(D)
			ETWU Total
			Maximum Allowed Water Allowance (MAWA)e

 

aHydrozone #      bIrrigation Method      cIrrigation         dETWU (Annual Gallons

/Planting       overhead spray      Efficiency         Required)=

Description E.g   or drip            0.75 for spray head      Eto x 0.62 x ETAF x Area

1) front lawn                   0.81 for drip          where 0.62 is a

2) Low water use                             conversion factor that

plantings                               acre-inches per acre per

3) Medium water                            year to gallons per

use planting                               square foot per year

eMAWA (Annual Gallons Allowed)=(Eto)(0.62)[(ETAF x LA) + ((1-ETAF) x SLA)]
   where 0.62 is a conversion factor that acre-inches per acre per year to gallons per square foot per year. LA is the total landscape area in square feet, SLA is the total special landscape area in square feet, and ETAF is .55 for residential areas and 0.45 for non-residential areas.

   ETAF Calculations         Average ETAF for Regular Landscape Areas must be 0.55 or below for residential areas, and 0.45 or below for non-residential areas.

 

Regular Landscape Areas
Total ETAF x Area	(B)
Total Area	(A)
Average ETAF	B ÷ A

 

 

All Landscape Areas
Total ETAF x Area	(B+D)
Total Area	(A+C)
Statewide ETAF	(B+D) ÷ (A+C)

 

(Ord. 814-2015, 2016)