Note: This test only works for water systems that are serviced by a municipal water service. Locate the outside faucet closest to the main line, or a utility sink and for best results you can install your irrigation plumbing tie in. (We will call this T “Tie-in”). Locate another faucet on your house and attach a pressure gauge (We will call this G “Gauge”). With faucet T completely open, check the pressure reading on the gauge at faucet G. If it is less than working pressure, turn down the water flow from faucet T until the reading reaches the working pressure your system requires (for example if you want to run your rotary heads at 35PSI and you will lose 12PSI in your plumbing and piping system you will require 47PSI at G).  If it is greater than the working pressure, record the pressure reading and go to next step. Place a five-gallon bucket under faucet T and time how long it takes to fill it with water. This test tells you how much water available, measured in gallons per minute (GPM).  Double check your GPM using the following formula: 60 seconds / time to fill the bucket x 5 (bucket size) = _____ GPM Enter your findings from the test here: ________ PSI ________ GPM This is how much water is available at the designated working pressure or at the higher reading that you recorded. Before you go any further, it is important to make sure you are starting off with the right flow and pressure information.  You may be getting a higher flow then the hydraulic system of the house is designed to handle. Therefore taking a few minutes now may save you countless headaches later!