一、 Static water pressure

A sound irrigation design cannot begin with subjective terms like “good pressure,” or “high pressure.” When gathering information at a project site, a water pressure reading or valid pressure assumption is very important.In the previous example, the designer or other person gathering the site data could have measured the water pressure with a pressure gauge rather than using the water purveyor’s estimate. However, it is important to design the irrigation system for the “worst case” pressure conditions.In most locales, the “worst case” situation will be on hot weekend days in the summer when a lot of people irrigate their lawns. The water purveyor probably uses a computer model to predict the lower summer pressures in their system, so they can provide data regardless of the season.The water purveyor may also be able to predict if pressures may change in the future. For example, they may be planning to install a new pump to increase pressure or conversely, the additional houses to be built in the future may cause the pressure to be lower. Good advice can generally be obtained from the professionals working for the water purveyor, and it is good to call them even if a pressure reading is made at the site.