Baseline Systems BaseStation 6000 - Manual (Page 126)

BaseStation 6000 Site Controller Manual
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Calculating the Application Rate for Dripper or Bubbler Zones
In zones watered by spray heads or rotors, the application rate is typically given in inches of water applied per hour. However, in
drip systems, application amounts are given in gallons per hour (GPH) or gallons per minute (GPM) rather than inches.
In order to configure a dripper or bubbler zone for ET in the BaseStation 6000 system, you need to convert the application rate
in that zone from GPH into inches per hour. Follow the steps below to complete the conversion.
1. Measure the area that the dripper zone covers, and then convert that measurement to square feet. In the example below
the zone measures 5 ft by 10 ft.
Use the following formula to calculate square feet:
2 50 10 5 ft ft ft
= ×
8. Count the number of emitters within that area, and then calculate the number of emitters per square feet. In the example
there are 12 emitters.
Use the following formula to calculate the number of emitters per square feet in the zone (in other words, one emitter
covers this much area within the zone):
2 2
24 . 0
ft 50
12
ft
emitters emitters =
9. Find the application rate of the emitters. In this example, it is 0.9 GPH.
10. Convert the application rate to cubic feet per hour using the following formula:
hr
ft
gal
ft
GPH
3
12 . 0
48 . 7
1
9 . 0
3
= ×
11. Take the cubic feet per hour (0.12) and divide by the emitters per square foot (0.24) to get feet per hour applied.
hr
ft
5 . 0
24 . 0
12 . 0
=
12. Convert the feet to inches.
hr
inches
ft
inches
hr
ft
6
12
5 . 0
= ×
In this example, the system delivers 6 inches of water per hour.