Digital Drip Designer

Daily Irrigation Requirement, U.S. gallons per day (gpd)
Crop  Evapotranspiration (Et), in/day: Alberta Et's
Effective Water Storage Factor: calculate
Row Spacing,ft:
Plant Spacing,ft:1
Number of emitters per plant:
Emitter operating time, hrs:
Coverage factor,% see table
Leaching Factor (1.0-1.1):
Application efficiency, decimal: select
Desired emission uniformity, decimal: select
Daily Water Requirement, gpd
Required emitter discharge, gph:

1Emitter spacing is same as plant spacing. For continuous wetting along row, use next calculator to determine emitter spacing and enter that value in the table above as the plant spacing.  For widely spaced trees enter the actual tree spacing.
(This  page updated December 20, 2004)

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Calculations used:

Daily Water Requirement, U.S. gallons per day (gpd):

gpd = 0.623 x Et x Eswsf x Rsp x Psp x Covf, where
Et = evapotranspiration, in/day
Eswsf = Effective soil water storage factor
Rsp = Row spacing, ft
Psp = Plant spacint, ft
Covf = Plant coverage factor

U.S gallons per hour (gph) =       gpd             
                                              hrs x #emitters,      where
gpd = U.S gpd
hrs = operating hours per day
#emitters = no. of emitters per plant

Required Emitter Discharge (emdis), U.S. gph:

emdis = gph x lf
             ae x Eu,      where
gph = U.S. gallons per hour above
lf = leaching fraction
ae = application efficiency
Eu = emission uniformity