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HomeMy WebLinkAbout216.00 (replaced 2020)2H:1V MAX .3H:1V MAX.3H:1V MAX . 1.CONDITION OF USE 1.1.A SEDIMENT POND SHALL BE USED WHERE THE CONTRIBUTING DRAINAGE AREA IS 3 ACRES OR MORE. 2.DESIGN AND INSTALLATION SPECIFICATIONS 2.1.THE POND SHALL BE DIVIDED INTO TWO ROUGHLY EQUAL VOLUME CELLS BY A PERMEABLE DIVIDER THAT WILL REDUCE TURBULENCE WHILE ALLOWING MOVEMENT OF WATER BETWEEN CELLS. THE DIVIDER SHALL BE AT LEAST ONE HALF OF THE HEIGHT OF THE RISER. WIRE - BACKED, 2-TO 3 FOOT HIGH, EXTRA STRENGTH FILTER FABRIC SUPPORTED BY TREATED 4"X4"s MAY BE USED AS A DIVIDER. ALTERNATIVELY, STAKED STRAW BALES WRAPPED WITH FILTER FABRIC MAY BE USED. 2.2.IF THE POND IS MORE THAN 6 FEET DEEP, A DIFFERENT MECHANISM MUST BE PROPOSED. 2.3.TO AID IN DETERMINING SEDIMENT DEPTH, ONE-FOOT INTERVALS SHALL BE PROMINENTLY MARKED ON THE RISER. 3.MAINTENANCE STANDARDS 3.1.SEDIMENT SHALL BE REMOVED FROM THE POND WHEN IT REACHES 1 FOOT IN DEPTH. 3.2.ANY DAMAGES TO THE POND EMBANKMENTS OR SLOPES SHALL BE REPAIRED. NOTES: POND LENGTH (3 TO 6 TIMES THE MAX. POND WIDTH) SILT FENCE OR EQUIVALENT DIVIDER RISER PIPE INFLOW KEY DIVIDER INTO SLOPE TO PREVENT FLOW AROUND SIDES EMERGENCY OVERFLOW SPILLWAY DISCHARGE TO STABILIZED CONVEYANCE, OUTLET, OR LEVEL SPREADER 6' MIN.12" MIN. 12" CREST OF EMERGENCY SPILLWAY RISER PIPE (PRINCIPAL SPILLWAY), OPEN AT TOP WITH TRASH RACK DEWATERING DEVICE (SEE RISER DETAIL, STD. PLAN 216.10) DEWATERING ORIFICE CONCRETE BASE DISCHARGE TO STABILIZED CONVEYANCE, OUTLET, OR LEVEL SPREADER EMBANKMENT COMPACTED 95%. PERVIOUS MATERIALS SUCH AS GRAVEL OR CLEAN SAND SHALL NOT BE USED WIRE-BACKED SILT FENCE, STAKED HAY BALES WRAPPED WITH FILTER FABRIC, OR EQUIVALENT DIVIDER 3.5' MIN. SEDIMENT POND PLAN VIEW AND CROSS SECTIONS STD. PLAN - 216.00 PUBLIC WORKS DEPARTMENT APPROVED: DATEGregg Zimmerman Public Works Administrator UNLESS OTHERWISE NOTED, DRAWING IS NOT TO SCALE (NTS) DocuSign Envelope ID: 6EECF5B6-602A-4E4A-B436-A317AA638878 9/28/2018 | 9:45 AM PDT