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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 <br />0 <br />Nk <br />24" <br />MINIMUM <br />X <br />24" <br />MINIMUM <br />MINIMUM 9 FT PER LINEAR FOOT <br />OF APPROVED DRAIN MATERIAL <br />60° TO 90° <br />DRAIN MATERIAL TO MEET FOLLOWING <br />SPECIFICATION OR APPROVED EQUAL: <br />SIEVE SIZE PERCENTAGE PASSING <br />1 %" <br />1" <br />88-100 <br />5-40 <br />0-17 <br />0-7 <br />0-3 <br />APPROVED PIPE TO BE <br />SCHEDULE 40 POLY- <br />VINYLCHLORIDE (P.V.C.) <br />OR APPROVED EQUAL. <br />MINIMUM CRUSH STRENGTH <br />1000 PSI. <br />PIPE DIAMETER TO MEET THE <br />FOLLOWING CRITERIA, SUBJECT TO <br />FIELD REVIEW BASED ON ACTUAL <br />GEOTECHNICAL CONDITIONS <br />ENCOUNTERED DURING GRADING <br />LENGTH OF RUN PIPE DIAMETER <br />INITIAL 500' <br />500' TO 1500' <br />> 1500' <br />NOT TO SCALE <br />GEOFABRIC SUBDRAIN <br />STANDARD SPECIFICATIONS FOR GRADING <br />Page 15 of 26 <br />4" <br />a <br />1.1 <br />