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