This assembly consists of a twelve-inch square frame and grate set atop a twelve-inch schedule forty polyvinyl chloride perforated riser pipe. The riser is encased in a pit of free-draining pit run material and one to two-inch diameter washed drain rock, all wrapped in non-woven geotextile fabric with a minimum one-foot overlap. The perforated pipe requires one-inch diameter holes spaced twelve inches center-to-center around the top, with no holes in the bottom third of the pipe. An isolated storm drain connects to the riser, and heat tape is required for installations under roadways or where cover is less than four feet. Advanced Drainage Systems N-12 corrugated high-density polyethylene pipe may be substituted for the polyvinyl chloride pipe, provided it meets American Association of State Highway and Transportation Officials Class II perforation standards.
PROVIDE MINIMUM 1' OVERLAP OF FABRIC 1"-2" DIA. WASHED DRAIN ROCK GEOTEXTILE FABRIC FREE DRAINING PIT RUN MATERIAL +/-2' 4' MINIMUM DEPTH OF BURY OR AS SHOWN ON PLAN +/-2' 1. MINIMUM PVC PERFORATION PATTERN SHALL BE 1" DIA. HOLES AT 12' C-C AROUND TOP OF PIPE. STAGGER HOLES. NO HOLES IN THIRD OF THE PIPE. 2. GEOTEXTILE FABRIC SHALL BE NON-WOVEN AMOCO 4545 OR APPROVED EQUAL. 3. ADVANCED DRAINAGE SYSTEMS ADS N-12 CORRUGATED HIGH DENSITY POLYETHYLENE (HDPE) PIPE MAY BE SUBSTITUTED FOR PVC PIPE. PROVE AASHTO CLASS II PERFORATION - ADS STANDARD PERFORATION. PIPE SHALL BE INSTALLED AS PER MANUFACTURE'S RECOMMENDATIONS. NOT TO SCALE STORMWATER DRAIN INLET / DRY WELL DETAIL DRY WELL/AREA DRAIN INLET 12" SQUARE FRAME AND GRATE URBAN ACCESSORIES OPCB RAW NICKEL BRONZE FINISH OR APPROVED EQUAL 12" SCHEDULE 40 PVC PERFORATED RISER OR APPROVED EQUAL ISOLATED STORM DRAIN WHERE SHOWN ON PLAN PROVIDE HEAT TAPE UNDER ALL ROADWAY OR LESS THAN 4' COVER 6 C401
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