HomeMy WebLinkAbout216.00INFLOW
FLOW
STABILIZED
ORUTLET OR
NOTES
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 - BACKE
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 REPLACED.
I y STD. PLAN - 216.00
+ + PUBLIC WORKS SEDIMENT POND PLAN VIEW
�NTo� DEPARTMENT AND CROSS SECTIONS
MARCH 2008
RISER PIPE
CREST OF 6' MIN. WIDTH
(PRINCIPAL SPILLWAY)
EMERGENCY SPILLWAY
OPEN AT TOP WITH
TRASH RACK
1' MIN. EMBANKMENT COMPACTED 95%.
�?
-III 2i9,
�
I; I
DEWATERING DEVICE
(SEE RISER DETAIL) \\
i
PERVIOUS MATERIALS SUCH AS
-_-_- - - - -_-_ GRAVEL OR CLEAN SAND SHALL
- - - - - _ NOT BE USED.
�--_- ----_-
I I I
I I I I I
I
I
I I I I I I
I I I I I I I I I I I I I -III
I -I I I
DEWATERING
III -III -III -III -III -III- _
III
WIRE -BACKED SILT FENCE,
ORIFICE III
III III III. .III -
STAKED HAYBALES WRAPPED
_III III
III III
WITH FILTER FABRIC, OR
DISCHARGE TO STABILIZED
EQUIVALENT DIVIDER
CONCRETE BASE
CONVEYANCE, OUTLET OR
LEVEL SPREADER
NOTES
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 - BACKE
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 REPLACED.
I y STD. PLAN - 216.00
+ + PUBLIC WORKS SEDIMENT POND PLAN VIEW
�NTo� DEPARTMENT AND CROSS SECTIONS
MARCH 2008