Pressure Calculation Worksheet#
Complete this worksheet for the most pressure-demanding lateral, print it and submit it to the City with the irrigation plan.
| a. Pressure available at point-of-connection | psi | ||
| b. Pressure loss through the meter | - | psi | |
| c. Pressure loss through the backflow prevention device | - | psi | |
| d. Pressure loss in mainline pipe from backflow prevention device to remote control valve | - | psi | |
| e. Pressure loss through remote control valve | - | psi | |
| f. Pressure loss in lateral pipe form remote control valve to most remote sprinkler | - | psi | |
| g. Elevation change from point-of-connection to most remote sprinkler (0.43 psi per foot of elevation, (+) if sprinkler is lower, (-) if sprinkler is higher) | +/- | psi | |
|
h. Miscellaneous losses through other valves, strainers, etc. (in some cases, this will not be applicable) |
- | psi | |
| i. Total possible pressure loss (total of b through h) | - | psi | |
| j. Remaining pressure (subtract i from a) | psi | ||
| k. Minimum pressure required at sprinkler | psi | ||
| l. Difference (subtract j from k)* | psi |
If value of l. is negative, a booster pump may be needed. If the value is more than +15 psi, pressure reduction may be necessary for this and/or other zones.
Did You Know?
Pre-cooling your home before 2 p.m. during the summer and coasting through the on-peak hours can save money on your utility bill.
Bluegrass lawns generally require 1" or more of water per week, depending on the weather.
Completing a building tune-up (retro-commissioning) ensures existing systems perform as designed.