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Key divider into slope - "----� <br /> aK prevent flow + <br /> arourp 4. —I <br /> Sediment • , iser = •it <br /> The pond length shall be 3 to 6 - <br /> times the maximum pond width ' Emergency overflow <br /> � � Y <br /> spillway <br /> # - <br /> i ��� <br /> Pond length ='- <br /> I Inflow �'�'�- -_ �.�.,;. <br /> Silt fence or I Discharge to stabilized <br /> `equivalent divider conveyance,outlet,or <br /> level spreader <br /> I -----\,___----- ' v <br /> 41 <br /> INote:Pond may be formed by berm or _ _by partial or complete excavation <br /> Figure 4.24—Sediment Pond Plan View <br /> I Riser pipe <br /> (principal spillway) Crest of <br /> open at top with emergen spillway 6'min.Width <br /> trash rackI <br /> �• ,1 ,,, Embankment compacted 95'Y <br /> I�_ �1► Dewatenng device ®_ =_='==r rvious materials such as <br /> i •`rs (see riser detail) - <br /> _I F _______ ______ gravel or clean sand shall <br /> 11= =_ _-=_-______-___-. not be used <br /> -.1I_. — L5. 1=! : ;--tt.�tt-•.-.--.... <br /> j . - — =1;. •.. ... .••=l=11=11=11=110411=!il�lir- . <br /> -11=11=117 1=11�...11=11F11�11`0li 11011 — l i j <br /> r— — -l — —I— Discharge to stabilized <br /> Wire-backed silt fence Dewatering Concrete base conveyance outlet or <br /> staked haales wrapped orifice (see riser detail) level spreader <br /> with filter fabric,or <br /> equivalent divider <br /> I <br /> Figure 4.25—Sediment Pond Cross Section <br /> Polyethylene cap Provide adequate <br /> strapping <br /> I Perforated polyethylene <br /> drainage tubing,diameter _ Corrugated <br /> min.2"larger than - metal riser <br /> dewatering orifice. = 3.5"min. <br /> Tubing shall comply = Watertight Dewatering orifice,schedule, <br /> with ASTM F667 and - <br /> AASHTO M294 = coupling Tack weld 40 steel stub min. <br /> Diameter as per calculations <br /> I I 6"min. r--- <br /> 18"min. T Alternatively,metal stakes <br /> Concrete base and wire may be used to <br /> prevent flotation <br /> Ik--2X riser dia.Min.--I <br /> Figure 4.26—Sediment Pond Riser Detail <br /> 1 <br /> February 2005 Volume II—Construction Stormwater Pollution Prevention 4-107 <br />