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FRONT VIEW <br /> SUBDRAIN OUTLET <br /> 24"Min. <br /> PIPE(MINIMUM 4"DIAMETER) <br /> v v v 12" <br /> 24"Min. <br /> SIDE VIEW <br /> 6" 1=l it <br /> l IV <br /> 6" I I�' <br /> _v• <br /> ALL BACKFILL SHOULD BE COMPACTED <br /> IN CONFORMANCE WITH PROJECT ° <br /> SPECIFICATIONS. COMPACTION EFFORT <br /> SHOULD NOT DAMAGE STRUCTURE . <br /> CONCRETE <br /> HEADWALL - 4" <br /> 0 0 <br /> 24"Min. <br /> NOTE: HEADWALL SHOULD OUTLET AT TOE OF SLOPE <br /> OR INTO CONTROLLED SURFACE DRAINAGE DEVICE <br /> ALL DISCHARGE SHOULD BE CONTROLLED <br /> THIS DETAIL IS A MINIMUM DESIGN AND MAY BE <br /> MODIFIED DEPENDING UPON ENCOUNTERED <br /> CONDITIONS AND LOCAL REQUIREMENTS <br /> NOT TO SCALE <br /> TYPICAL SUBDRAIN OUTLET HEADWALL DETAIL <br /> STANDARD SPECIFICATIONS FOR GRADING <br /> Page 17 of 26 <br />