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CANYON SUBDRAIN DETAILS <br /> SURFACE OF <br /> COMPETENT <br /> MATERIAL <br /> \ \ 1.11 loll <br /> COMPACTED FILL /// <br /> TYPICAL BENCHING \ / <br /> / REMOVE UNSUITABLE <br /> MATERIAL <br /> SEE DETAILS BELOW <br /> INCLINE TOWARD DRAIN <br /> AT 2% GRADIENT MINIMUM <br /> TRENCH DETAILS <br /> 6" MINIMUM OVERLAP <br /> OPTIONAL V-DITCH DETAIL MINIMUM 9 FT PER LINEAR FOOT <br /> OF APPROVED DRAIN MATERIAL <br /> MIRAFI 140N FABRIC <br /> OR APPROVED EQUAL MIRAFI 140N FABRIC <br /> OR APPROVED EQUAL <br /> 6" MINIMUM OVERLAP O <br /> 724" <br /> APPROVED PIPE TO BE <br /> SCHEDULE 40 POLY- <br /> VINYLCHLORIDE(P.V.C.) <br /> MINIMUM OR APPROVED EQUAL. <br /> MINIMUM CRUSH STRENGTH <br /> MINIMUM 9 FT PER LINEAR FOOT 1000 PSI. <br /> MINIMUM OF APPROVED DRAIN MATERIAL <br /> 60°TO 90° <br /> DRAIN MATERIAL TO MEET FOLLOWING PIPE DIAMETER TO MEET THE <br /> SPECIFICATION OR APPROVED EQUAL: FOLLOWING CRITERIA,SUBJECT TO <br /> FIELD REVIEW BASED ON ACTUAL <br /> SIEVE SIZE PERCENTAGE PASSING GEOTECHNICAL CONDITIONS <br /> ENCOUNTERED DURING GRADING <br /> 1 %" 88-100 LENGTH OF RUN PIPE DIAMETER <br /> 1" 5-40 <br /> INITIAL 500' 4" <br /> %4" 0-17 500'TO 1500' 6" <br /> a" 0-7 > 1500' 8" <br /> NO.200 0-3 <br /> NOT TO SCALE <br /> GEOFABRIC SUBDRAIN <br /> STANDARD SPECIFICATIONS FOR GRADING <br /> Page 15 of 26 <br />