ESP-SMT Smart Modular Control System
81
Total Area Covered Method to Determine
Precipitation Rate and Efficiency (moderate
accuracy)
1.
Determine the Manufacturer and Model of the
sprinkler being used in the zone, making particular
note of the specific nozzle being used at each
sprinkler location. For Example a Rain Bird 5004 with
the following MPR nozzles are being used on Zone 1
(Full Circle = MPR 30Q, Half Pattern = MPR30H and
Quarter Patterns = MPR30Q). See illustration in the
next column.
2.
Determine the operating water pressure at the
Sprinkler Nozzle. Example = Water Pressure = 45 psi.
3.
Obtain Catalog Information for Sprinkler (This
information is usually found on the Manufacturer
web site).
5004 MPR Nozzle Series @ 45 psi
Model
Radius
Pattern
Flow (GPM)
30Q
30 Foot
Quarter 1.40
30H
30 Foot
Half
2.59
30F
30 Foot
Full
5.78
4.
Determine the Total Amount of flow (GPM) for the
area being covered by the zone.
Example: (4) 30Q’s @ 1.40 GPM+ (6) 30H’s @ 2.59
GPM + (2) 30F’s @ 5.78. Total Zone 1 Flow = 32.7GPM
5.
Determine the Total Area (square feet) covered by
Zone 1.
Example: the area is 60 feet by 90 feet = 5,400 square
feet (SF)
6.
Calculate the Precipitation Rate (PR) using the
following formula:
Total Flow (GPM) X 96.3
____________________
Total Area (sq. ft.)
Example: Zone 1 PR = 32.7 X 96.3
__________
5,400
7.
Enter 0.58 inches per hour into the ESP-SMT
controller based on information contained on page
20-21 of this User Manual.
30Q
(1.40)
30Q
(1.40)
30Q
(1.40)
30 H
(2.59)
30 H
(2.59)
30 H
(2.59)
30 H
(2.59)
30 H
(2.59)
30F
(5.78)
Irrigated
Area
30F
(5.78)
ZONE 1
TOTAL
FLOW
(32.7
GPM)
30 H
(2.59)
30Q
(1.40)
90 FT.
60 FT.