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This Site is a tool designed to assist a sprinkler system installer with calculations and a list of the most likely parts and quantities. Being a tool, it will likely not work as well for some projects as it does for others. The parts list is based on installing a PVC sprinkler system. The goal is for this site to help the installer save time and money. We will work hard to improve the calculations and make updates as they become necessary. Double check calculations and quantities before making your purchases.
A Backflow is required for any sprinkler system supplied from culinary (drinking) water. If you are not familiar with Backflows you need to do some research for your particular area since there are different requirements for different areas.
Enter the available water supply for irrigation. Available water supply is rated in gallons per minute (GPM). If you don't know what the available water supply is for the property, it can be measured, or it is generally safe to guess based on pipe size. Best guesses based on pipe size, 15 GPM for 1 inch pipe, 11 GPM for 3/4 inch pipe or 6 GPM for 1/2 inch pipe.
Percent used is the maximum amount of water you desire to use for irrigation. While you can, in theory, use 100 percent, it is recommended that you use 70-80 percent, after all, it is nice to have water available for things like showering, washing dishes, etc.
This selection is used to help determine the best way to connect to the existing water supply.
This is a must in areas that have hard freezes. The stop and waste is a shutoff valve that drains the down stream water from a main line. It is generally installed at the point of connection that is leading to the sprinkler system (generally close to the meter or a building). The Weep hole allows water to escape when the valve is closed. Thus a stop and waste is regularly installed at a depth that is sufficient to prevent freezing of the live side of the water main.
This divides the system into sections. Example: Front and Back Yard. Generally a residential sprinkler system will only have 1 or 2 locations. keep in mind that by choosing multiple locations the parts list won't be as accurate. We will strive to improve this function. It is recommended that you choose 1 or 2 locations.
Will You Be Installing Any Garden Spigots / Free Standing Hose Bibs?
Garden Spigots are a great source for large volumes of water to be supplied with a garden hose. They tend to have more volume and pressure than a regular garden spigot. The most common uses are filling a pool or hot tub quickly, and sprinkler system winterization (Access directly to the main line for blowing the system out with air).
Below, you will input sprinkler heads and emitters by selecting them by their nozzle size or emitter GPM. Simply press the plus button for the corresponding nozzle or emitter GPM. You can likewise remove a selection by pressing the subtract button.
If you are planning to use Hunter products the calculations will be comparable if you select the nozzles by distance
It is not recommended that you use standard VAN nozzles sizes 4, 6, 8 and 10 with this tool at this time. Substitute with HE-VAN or MPR nozzles for these sizes where applicable. If you must use standard VAN Nozzles, input these sizes using the nozzle that would be considered the next size up, as standard VAN nozzles have a higher GPM.
Drip emitter stations very greatly, thus to keep the parts list more accurate we need some additional input. The linear feet of drip is representing the length of the area where you intend to install drip lines.
The number of areas covered by drip, is the total locations for the whole yard. Example: If you are installing drip in 2 garden boxes and 1 flower bed you would enter 3 total locations.
Drip, Bubblers and Xeri Sprays are all covered in this section. You will need to know the GPH (Gallons Per Hour) for the emitters you plan to use. Simply select the option below that matches your rate of flow in GPH. If you are unsure which emitters to choose, here are some popular options/resources.
These calculations will work with all drip manufacturers as long as you choose the correct emitter for the rate of flow.
Last updated: March 02, 2019
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