Straw wattles require a 2-inch to 3-inch deep by 9-inch wide trench excavated along the contour of the slope. Place the wattle into the trench to follow the soil surface and compact excavated soil against the uphill side of the wattle. Adjacent wattle rolls must tightly abut one another. Secure the assembly using 18-inch to 24-inch long 1-inch by 1-inch wood stakes driven through the center of the wattle at 3-foot to 4-foot intervals, with additional stakes at each end. Drive stakes perpendicular to the slope face, leaving at least 2 inches to 3 inches of the stake exposed above the wattle. Determine wattle spacing by slope gradient, ranging from 5 feet for slopes steeper than 1:1 to 50 feet for slopes flatter than 6:1.
NOTE 1. BEGIN AT THE LOCATION WHERE THE WATTLE IS TO BE INSTALLED BY EXCAVATING A 2"-3" DEEP BY 9" WIDE TRENCH ALONG THE CONTOUR OF THE SLOPE. EXCAVATED SOIL SHALL BE PLACED UP-SLOPE FROM THE ANCHOR TRENCH. 2. PLACE THE WATTLE IN THE TRENCH SO THAT IT CONTOURS TO THE SOIL SURFACE. COMPACT SOIL FROM THE EXCAVATED TRENCH AGAINST THE WATTLE ON THE UPHILL SIDE. ADJACENT WATTLES SHOULD TIGHTLY ABUT. 3. SECURE THE WATTLE WITH 18"-24" STAKES EVERY 3'-4' AND WITH A STAKE ON EACH END. STAKES SHALL BE DRIVEN THROUGH THE MIDDLE OF THE WATTLE LEAVING AT LEAST 2"-3" OF STAKE EXTENDING ABOVE THE WATTLE. STAKES SHALL BE DRIVEN PERPENDICULAR TO THE SLOPE FACE. 4. EROSION CONTROL PLAN AND LOCATION OF STRAW WATTLES SHALL BE AS SHOWN ON PLANS OR AS APPROVED BY THE ENGINEER. TYPICAL WATTLE SPACING BASE ON SLOPE GRADIENT ENTRENCHMENT DETAIL TYPICAL WATTLE INSTALLATION >1:1 5' 2:1-1:1 10' 4:1-2:1 20' 6:1-4:1 25' <6:1 50' INSTALL STAKE PERPENDICULAR TO SLOPE FACE INSTALL WATTLE IN A SHALLOW TRENCH (2"-3" DEEP) COMPACT EXCAVATED SOIL UPSLOPE OF WATTLE ADJACENT ROLLS SHALL TIGHTLY ABUT INSTALL WITH 18" OR 24" 1"x1" WOOD STAKES LEAVE TOP 2"-3" OF STAKE EXPOSED 3'-4' 3'-4' SPACING DEPENDENT ON SLOPE GRADIENT NOT TO SCALE TYPICAL STRAW WATTLE DETAIL 3 C401
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