AMX RADIA LIGHTING CONTROL ENCLOSURE WORKSHEET GUIDE Specifications download pdf (Page 65)

9. Appendices

Rain Bird

ET Manager Series - Installation and Operation Manual 65

Appendix V. Calculating Precipitation Rates and Station Run Times

Precipitation Rate

Each station in a sprinkler system applies water at a given rate, known as the precipitation rate, expressed in inches

per hour. Precipitation rates vary based on the sprinkler type, spacing, nozzle, pressure, and sprinkler layout. There

are three ways to determine the precipitation rate:

Option 1: Refer to the manufacturer sprinkler performance charts.

Option 2: Use the industry accepted precipitation rate formula:

96.25 x Sprinkler Gallons per Minute (gpm)

Precipitation rate (in/hr) = ———————————————————————————

Sprinkler Head Spacing (ft) x Sprinkler Row Spacing (ft)

Note: 96.25 is a constant used as a conversion factor

Option 3: Perform a catch can test to measure the amount of water applied by the sprinklers in a given time

period. The following formula

Average Catch Can Value 60 Minutes

Precipitation rate (in/hr) = ——————————————————- x ———————

Catch Can Test Duration (minutes) 1 Hour

Station Run Time

Station run time is based on the Irrigation Amount and precipitation rate. For example, if the Irrigation Amount is

0.5” and the precipitation rate of the sprinklers for a station is 1.5” per hour, the station must run for 20 minutes to

apply 0.5” of water.

You can calculate the station run time using the precipitation rate and the Irrigation Amount:

Irrigation Amount x 60

Run Time = ———————————————

Precipitation Rate

Note: The station run time may need to be adjusted based on the sprinkler distribution uniformity.

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AMX RADIA LIGHTING CONTROL ENCLOSURE WORKSHEET GUIDE Specifications Page 65