330 likes | 338 Views
2018 SHADE Conference. “Fundamentals (Keys) of Basic Irrigation Design”. Fundamentals of Basic Irrigation Design. 1. Keys to a Successful Project 2. Key Terms Review 3. Key Concepts 4. Keys to Efficient Design 5. Spare Keys. Keys to a Successful Project. Design Installation Maintenance.
E N D
2018 SHADE Conference “Fundamentals (Keys) of Basic Irrigation Design”
Fundamentals of Basic Irrigation Design 1. Keys to a Successful Project 2. Key Terms Review 3. Key Concepts 4. Keys to Efficient Design 5. Spare Keys
Keys to a Successful Project Design Installation Maintenance
Key Irrigation Terms Flow - Gallons Per Minute (GPM) Flow - Gallons Per Hour (GPH) Pressure – Pounds Per Square Inch (PSI) Velocity – Feet Per Second (FPS) Friction Loss - Pressure loss as water moves through irrigation system components
Key Irrigation Terms Precipitation Rate – Inches Per Hour (PR) Matched Precipitation Rate (MPR) Head-to-Head Coverage Evapotranspiration (ET) Distribution Uniformity (DU) Static & Dynamic Water Pressure
Key Concepts A sprinkler system has to have enough water and pressure to make it work properly. Where do the water and pressure come from?
Key Concepts • Gravity – for each foot of elevation change, .433 psi of pressure is gained (or lost). • At the base of a 100’ water tower, how much water pressure would you have? • Pressure is lost as water moves through the components of an irrigation system.
Keys For Safe Flow • The maximum allowable loss through the meter should be less than 10 percent of the inlet pressure at the meter. • The maximum flow (gallons per minute) through the meter should be 75% of the maximum safe flow through the meter. • The velocity of the water flow (ft/s) through the service line supplying the meter should not exceed approximately 7 feet per second for metal pipe and 5 feet per second for plastic pipes. “Foundations of Landscape Irrigation Design” - IA
Key Concepts • Schedule 40 Mainlines • Class 200 Laterals • Class 200 Pipe Sizing • 0-5 GPM 1/2” • 6-10 GPM 3/4” • 11-16 GPM 1”
Keys to Efficient Design Rain Bird Maxi Paw 08 nozzle .45 in/hr at 45psi Matched Precipitation Rate
Keys to Efficient Design Matched Precipitation Rate Rotor Nozzles
Keys to Efficient Design Rain Bird Maxi Paw 08 nozzle .45 in/hr at 45psi Rain Bird Mini Paw 07 nozzle .38 in/hr at 45psi Rain Bird 10H nozzle 1.52 in/hr at 30psi Toro 8H nozzle 1.80 in/hr at 30psi Toro 15H nozzle 1.77 in/hr at 30psi Toro 12H nozzle 1.72 in/hr Hunter PGP 06 nozzle .36 in/hr at 40psi Hunter 10A nozzle 1.88 in/hr at 40psi Hunter 17A nozzle 1.47 in/hr at 40psi
Keys to Efficient Design Distribution Uniformity (DU) The DU is a measurement of uniformity, expressed as a percentage, comparing the driest 25% of the area to the average distribution in the area (DU low quarter). A perfectly uniform application would be represented by a DU of 100%. A less uniform application is represented by a lower percentage.
Keys to Efficient Design PRS ensures optimal performance at 30 PSI Eliminates misting & fogging Reduces costly accidents and property damage Restricts water loss by 70% with damaged nozzle
Keys to Efficient Design Rain Bird 5000 Series Rotor with PRS: In-stem pressure regulation reduces inlet pressure to 45 psi Eliminates head-to-head pressure variation Eliminates misting Improves distribution uniformity
Keys to Efficient Design Hunter PRB Rotors (PGP & I20 models available)
Keys to Efficient Design Pressure-compensating emitters
Keys to Efficient Design Most irrigation manufacturers now sell “Smart Controllers”
Spare Keys • 1. Sprinklers have to have enough • water and pressure to work • 2. Don’t mix and match different • kinds of sprinklers on a zone • 3. Smart Controller on idiot sprinkler system equals idiot sprinkler system • 4. Don’t exceed a velocity of 5’ per • second in lateral piping • 5. Use head-to-head spacing
Spare Keys • 6. Use goof plugs • 7. Use water tight wire connectors • 8. Don’t run ½” poly more than 300’ • 9. Don’t run spaghetti more than 5-10’ • 10. Use pressure compensating emitters • Also not head-to-head spacing! • 11. Use MPR nozzles • 12. Use high efficiency nozzle