This subdrainage assembly for a tree planting pit integrates a four-inch perforated pipe set in drain rock to prevent standing water around the rootball. A drainage course sits beneath the planting soil and slopes toward a high point with a five percent grade, resting over compacted subgrade. The excavation features sloped side walls at a one-to-one ratio leading down to the subdrainage trench.
PLANTING SOIL COMPACTED SUBGRADE SEE CIVIL DRAWINGS DRAINAGE COURSE SEE CIVIL DRAWINGS SUBDRAINAGE 6". 1'-0" 5% 1 1 5% 5% HIGH POINT 1:1 1:1 1:1 1:1 DRAIN ROCK 4" PERF.PIPE DRAIN COURSE ROOTBALL
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