Irrigation Basics for Landscape Irrigation Contractors – LSU AgCenter 1 Sprinkler Layout and Uniformity Sprinkler Layout and Uniformity Dr. Ron Sheffield LSU Ag Center, Biological & Agricultural Engineering [email protected]Sprinkler Spacing Sprinkler Spacing S S r Square Spacing S S s Triangular Spacing Head Spacing Head Spacing y Uniformity y Wind effects y Dependability of sprinklers ◦ A broken or stuck sprinkler isn’t doing its job y Sprinkler overthrow and overlap ◦ Runoff on streets or sidewalks many times is the result of improper sprinkler layout or excessive applications due to overlap Compensating for Wind Compensating for Wind y 0 – 3 mph winds ◦ S s & S r = Diam. * 0.55 y 4 – 7 mph winds ◦ S s & S r = Diam. * 0.50 S S r y 8+ mph winds ◦ S s & S r = Diam. * 0.45 S S s Sprinkler Uniformity Sprinkler Uniformity Uniformity Uniformity y The less uniform a system is, the more water it takes to deliver the appropriate amount of water to a plant y DU = Distribution uniformity DU (percent) Water the plant needs ÷ DU (decimal) = Amount of water you need to apply to keep dry areas green 30% 1.00” ÷ 0.30 = 3.33” 50% 1.00” ÷ 0.50 = 2.00” 70% 1.00” ÷ 0.70 = 1.42”
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Irrigation Basics for Landscape Irrigation Contractors – LSU AgCenter
1
Sprinkler Layout and UniformitySprinkler Layout and Uniformity
Dr. Ron SheffieldLSU Ag Center, Biological & Agricultural [email protected]
Sprinkler SpacingSprinkler Spacing
S
Sr
Square Spacing
S
SsTriangular Spacing
Head SpacingHead SpacingUniformityWind effectsDependability of sprinklers◦ A broken or stuck sprinkler isn’t doing its jobp g j
Sprinkler overthrow and overlap◦ Runoff on streets or sidewalks many times is the
result of improper sprinkler layout or excessive applications due to overlap