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Irrigation Design 2 - Determining water and power supply
Source:rember | Author:cynthia | Publish time: 2017-09-13 | 1791 Views | Share:

In the first section of this step, the designer needs to establish two points of critical information concerning the water supply. The first number is the flow in gallons per minute (meters cubed per hour or liters per second) available for the irrigation system. The second is the working pressure in pounds per square inch (bars), at the previously determined flow, at the point-of-connection (POC) for the system.
The information gathered on site plays an important role here. The needed data includes:
• static water pressure
• water meter size
• service line size
• service line length
• type of service line pipe
The static water pressure should have been determined either by the direct pressure gauge reading, or obtained from the water purveyor. Remember that the lower pounds per square inch (bar) figure for the summer, daylight pressure (or “worst case” condition) is the number to use.

       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 purveyors 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.

二、Water meter size

       The size of the water meter is usually stamped or cast somewhere on the upper half of the meter itself. Sometimes,the size is printed inside the reading lid of the meter, right next to the dials. Typical water meter nominal sizes include 5/8 in , 3/4 in, 1 in, 1-1/2 in and 2 in (18 mm, 20 mm, 25 mm,40 mm and 50 mm).If you are unable to find the water meter size, contact your water purveyor. As you will see in a moment, the size of the meter can be a determining factor in the flow available for the system.
The service line statistics are necessary to figure out which pipe flow loss chart to use in this step. The line may be a completely different size than the meter. The length of this line will be used with the appropriate pipe chart when determining the working pressure at the point-ofconnection.

       Calculating water meter capacity and working pressure.