Irrigation Professionals with questions about ... - Hunter Industries

Dynamic Pressure - The available dynamic pressure, also known as workingpressure, is simply the water pressure calculated while the water is flowing.The “Dynamic Pressure at Design Capacity” is a calculation of the pressure(PSI) available at the maximum system flow rate. This pressure is calculatedat the system Point of Connection (POC). The dynamic pressure at the POCwill influence your choice of sprinkler heads. For example, you would notchoose a head with an operating pressure rating that is above the availabledynamic pressureEstimated Dynamic Pressure at Worst Case Head - Once the DynamicPressure at Design Capacity is calculated, an estimate is made of the pressurethat will be available for the sprinklers. The “Worst Case Head” indicates thishead is the highest head in the system. The Design Capacity (GPM) andEstimated Dynamic Pressure at Design Capacity (PSI) are used to select thesprinklers. Pressure and flow limitations are two of the prime factors insprinkler selection.Flow - The volume/velocity rate water moving through a system. This can bemeasured in gallons per minute (GPM), gallons per hour (gph), liters persecond (l/s), liters per minute (l/min), or cubic meters per hour (m 3 /hr).Point of Connection - The Point of Connection (POC) is where the irrigationsystem is connected to the water source. This represents a logical orconvenient location to connect the irrigation system to the water supply.Service Line - The service line is the pipe connection between the city mainin the street and the water meter. In the case of unmetered systems, it is thepipe between the city water main and the curb stop.Water Meter - A device used to measure water usage. In southern climates,the meter is usually located near the property line, close to the city main line.In northern climates, the meter is usually in a basement or other indoorlocation.Working Pressure - See Dynamic Pressure