Drip Design for Landscape

The Equation

These are the formulas used by the calculators to determine the estimated water use and number of emitters per plant.

Water Use Per Plant

Where:

= Water use per plant (gpd)

= Individual plant area (sq. ft)

= Plant type. An arbitrary value used to account for different plant types. (see table)

= Climate type. An arbitrary value used to account for different climate types. (see table)

Number of Emitters Per Plant

Where:

= Number of Emitters Per Plant

= Water use per plant from Estimated Water Use per Plant calculator

= Emitter flow rate (gpd)

Plant and Climate Type Values

Plant Type ()	Value		Climate Type ()	Value
Trees	1.1		Cool Humid	0.13
Shrubs	0.9		Cool Dry	0.17
Ground Cover	1		Warm Humid	0.18
Mixed	1.1		Warm Dry	0.22
Turf Grass	0.8		Hot Humid	0.25
			Hot Dry	0.33

Reference: Washington State University