NETAFIM USA Landscape & Turf Product Catalog | 7 SOIL TYPES AND SLOPES Determining the Proper Emitter to Use is Based Primarily on the Soil Type and Slope. The Maximum Precipitation Rates Chart from the U.S. Department of Agriculture shows the ability of various soils to absorb water. This information is important because it is the best way to show how different soils manage water. In the case of Coarse Sandy Soil on a 0 to 5% Slope, it can absorb 2.00” of water if covered with vegetation. Conversely, a heavy clay/clay loam soil can only accept about 0.20”. This means that sandy soil does not hold water as well as tighter soils. It also means that sandy soil will not radiate the water as far laterally and upward as a tighter soil. As such, care needs to be taken when deciding what emitter flow rate to use and how far apart the emitters can be from each other. And as the slope increases, this takes on even greater importance. SLOPES AND BERMS Techline Copper, CV XR, and CV emitters have a built-in check valve. This allows Techline Copper to hold back up to a 8.3’, Techline CV and CV XR up to 4.6‘ column of water. As such, designing Techline Copper, CV XR, and CV on slopes and berms is very easy. • Techline Copper, CV XR, and CV should be installed perpendicular to (across) slopes. • In the upper 2/3 of the slope, space Techline Copper, CV XR, and CV per General Guidelines tables. • In the lower 1/3 of the slope, increase the distance between rows by 25%. • For every 4.6’ elevation change, when using Techline CV or CV XR: - Split the slope into separate zones, or - Install a Netafim in-line check valve (TLCV050M1). • For every 8.3’ elevation change, when using Techline Copper: - Split the slope into separate zones, or - Install a Netafim in-line check valve (TLCV050M1). 18" at Top Up To +25% 22 1/2" at Bottom 2/3 1/3 MAXIMUM PRECIPITATION RATES (Inches per Hour) SOIL TEXTURE COARSE SANDY SOIL COARSE SANDY SOIL OVER COMPACT SUBSOIL LIGHT SANDY SOIL LIGHT SANDY SOIL OVER COMPACT SUBSOIL UNIFORM SILT LOAM SILT LOAM OVER COMPACT SUBSOIL HEAVY CLAY / CLAY LOAM 0% TO 5% SLOPE 2.00 2.00 2.00 1.50 1.50 1.00 1.00 1.00 1.75 1.50 1.25 1.00 1.00 0.75 0.75 0.40 1.75 1.00 1.25 0.80 1.00 0.60 0.75 0.40 1.25 0.75 1.00 0.50 0.75 0.40 0.50 0.30 1.00 0.50 0.80 0.40 0.60 0.30 0.40 0.20 0.60 0.30 0.50 0.25 0.40 0.15 0.30 0.10 0.20 0.15 0.15 0.10 0.12 0.08 0.10 0.06 COVERED BARE 5% TO 8% SLOPE COVERED BARE 8% TO 12% SLOPE COVERED BARE COVERED BARE 12% TO 20% SLOPE Note: The above average values are for reference purposes. Data may vary with respect to actual soil and site conditions. Data from USDA.
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