Sometimes it is not practical to obtain perfection! Otherwise you’ll wind up having to look the information up over, and over, and over…. There are also spray nozzles called “center-strips” which don’t work as well. Example: You note that a spray type head on your plan is a 1/2 circle pattern and the distance to the 3 closest adjacent heads are 13 feet, 12 ft., and 14 ft.. .55 PSI – 3.0 GPM The weep hole allows water to escape when the valve is closed. Underground, above-ground and elevated tanks are examples o… 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. You need to trust me on this one! 1. Rotors: Rotor-type heads aren’t quite as easy. 30 PSI – 3.2 GPM Place smaller shrubs near the lawn, with larger growing varieties behind them next to the fence. You can’t do it, can you? Traveling Big Gun Sprinkler: Calculate the net water application for a given flow rate, efficiency percentage, lane width, and travel speed. For 30-39′ spacing between sprinklers- 55 PSI – 8.0 GPM If installed properly, MP Rotators are the most efficient type of sprinklers available. Important: do not mix different brands of spray heads and nozzles together on the same valve circuit without checking to see that they have the same performance specifications. This website uses both first-party and third-party cookies. Take the sprinkler head watering DIAMETER and multiply it by 0.6 to get the absolute maximum distance that should ever occur between any two adjacent sprinklers. Not a good start for a future irrigation expert! If you do not enter a pressure for the system, the App will assume it is 55 PSI. Not enough to cause mud, but you would definitely see rings of greener grass around the sprinklers! They tend to have a weak coverage area on either side of the nozzle (the yellow area in the drawing above). 40 PSI – 4.5 GPM To the extent possible a sprinkler should be equal distance from the adjacent sprinkler in each direction (forming a triangle if possible). Prior to locating the design area, there is the question of how many sprinklers are to be included. The area of coverage of a single sprinkler shall not exceed 400 square feet (37 m 2) and shall be based on the sprinkler listing and the sprinkler manufacturer's installation instructions. We will strive to improve this function. Sprinkler Required: x: Recommended sprinklers to buy: x: Distance Between Sprinklers . Sprinklers shall then be spaced accordingly. This is one reason I strongly suggest that you use a smaller nozzle if possible rather than using the radius adjustment screw on the sprinkler. This means that a sprinkler with a radius of 15' with a full nozzle will actually cover a 30' area. The area between the lawn (green line) and the edge of the property (brown line) would most likely be planted with shrubs and irrigated separately from the lawn. Changes in spacing between adjacent sprinklers should be made as a gradual transition when possible. 30 PSI – 1.6 GPM Be sure to list the PSI and GPM for each head as given in the manufacturer’s literature, along with the maximum spacing between heads. Ignore the radius given by the manufacturer. I prefer the so called “side-strip” type that you place along the edge of the area, they have better patterns than the center strip nozzles. Rotor heads move back and forth across the area to be watered. A review of the criteria for the allowable coverage area based on the specific occupancy, ceiling construction configuration and type of sprinkler utilized will be presented. One more time: The water from any single sprinkler should actually get the sprinklers on each side of it wet! Precipitation rate must be considered when selecting your sprinkler heads to eliminate water application uniformity problems (dry spots). That’s right, 100% overlap of watered areas is REQUIRED or you will get dry spots! ), as winds over 10 mph really mess up the sprinkler patterns. Sprinkler spacing is measured by radius. The Equation. Look in the yellow pages under “Irrigation” or “Sprinklers”, or try one of the online stores listed in the tutorial links pages. If all or a majority of your rotors will be spaced at 20-29′ apart, then you should probably use larger nozzles than I recommend in the chart. Shrubs also typically use less than half the water of lawn areas of the same size, saving money spent for water. Drip Design for Landscape. Drip Line Application Rate. Click to read disclaimer and legal agreement. This question is primarily addressed by the occupancy hazard classifi- cation, but the designer also has some freedom to decide this matter. Extended Coverage Sprinkler Heads. You will find a tool for measuring GPM below. Write down on your plan the GPM for each sprinkler next to the sprinkler symbol. Sprinklers that are placed closer than 6 feet apart need some special consideration. These calculations will work with all drip manufacturers as long as you choose the correct emitter for the rate of flow. So they try to make it look like you can use less sprinklers with their brand. Multiply the diameter of the circular spray pattern of the sprinkler you want by 50 percent, or 0.50. Drip irrigation is the ideal complement to traditional irrigation . 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 other reason is that when you reduce the radius you really should also reduce the GPM of the sprinkler. The result was big dry spots, and my parents wound up replacing the sprinkler system a few years later. Available water supply is rated in gallons per minute (GPM). Now that I’m a bit wiser and more knowledgeable I realize there is a good reason behind the head-to-head coverage. Most rotors now come with a “nozzle tree” that contains most of the different nozzles for the rotor, so you can change the nozzle sizes if you need to.