Toro DL2000 User's Guide download pdf (Page 20)

Landscape Dripline Design _____________________________________________________________

■ Irrigation Scheduling

Irrigation

Scheduling

Irrigation scheduling with dripline uses the same methods of

calculation as with sprinklers. The dripline grid system is designed to

wet the irrigated area completely by methods similar to those used

with sprinklers, supplying water in inches per hour. For efﬁcient water

application, it is necessary to apply water rates equal to or less than the

rate at which the plants use water (evapotranspiration rate; ET). The ET

rate is expressed in inches per unit of time, thus our application rates

are expressed in inches per hour. (For regional ET data, refer to the

Toro Rainfall and Evapotranspiration Data Book, Form No. 490-1358.)

The following formula is used to determine application rates for

subsurface drip irrigation.

Application rate (inches per hour) = 231.1 x Emitter ﬂow (GPH)

Dripper spacing x Dripline spacing (in inches)

For example: Dripline row spacing = 12”

Dripline emitter spacing = 12”

Emitter ﬂow rate = .53 GPH

231.1 x .53 GPH = .85 inches per hour

12 (inches) x 12 (inches)

Or, use the Water Application Rate Table below to determine

application rates.

Emitter

Spacing

Flow Rate

Dripline Spacing

12” 18” 24”

DL2000®

and Drip In®

12” 0.5 GPH 0.85 0.57 0.43

18” 0.5 GPH 0.57 0.38 0.28

12” 1.0 GPH 1.64 1.09 0.82

18” 1.0 GPH 1.09 0.73 0.55

Emitter

Spacing

Flow Rate

Dripline Spacing

6” 12” 18”

Microline

and Soakerline™

6” 0.5 GPH 3.98 1.99 1.33

12” 0.5 GPH 1.99 1.00 0.66

TABLE 3.1

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 47 48

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Toro DL2000 User's Guide Page 20

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