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GENERAL40715
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Last modified
8/24/2016 7:59:51 PM
Creation date
11/23/2007 10:49:46 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1988112
IBM Index Class Name
General Documents
Doc Name
APPLICATION FOR EROSION CONTROL DAM
Media Type
D
Archive
No
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<br />STATE OF COLORADO <br />DNISION OF WAi~ER RESOURCES <br />OFFICE OF STATE ENGQdEER <br />TO GOVERN THE CONSTRUCTION OF AN EROSION CONTROL DAM <br />Prepare[iom of Fouodatiaa for Dam-All vegetable matter of every description, including roots to a depth of two feet, shall be removed from <br />the entire area upon which the dam will test, together with boggy or unstable materials and deposited outside the toes of the data The batiks <br />of the stream channel shag be dressed to a slope of about 11:1. A cutoff trench, with sloping sides and a bottom width of not less than 5 feet and <br />depth of 4 feet, shall then be converted beneath the meta line of the dam the full latgth thereof which treirch shall be refilled with the most <br />impervious materials available. The fourdation of the dam shall then be lighdy plowed lengthwise of the data to provide proper contact between <br />the foundation and the dam embanlrmerit. <br />Plsorig of Dam Embanltmt~ The materials shall be placed in the cutoff tratch and in the embariktiieat of the dam in layers trot exceeding <br />6 inches in thiclmess, after which each layer shall be dioroughly compacted by a heavily loaded disc cultivator, a ,.ronugated or sheep's foot roller, <br />the treads of a nterpi7lar or trtidcs, or by livestock used in the co2~+*+t~oa During the cor~strucdoa period, the top of Ute embanl®eat shall be <br />maintained as a horizontal plane the full width and length thereof, and no side dumping of materials shall be permitted. The materials shall at <br />ell times contain suffident moisture ro provide proper compacdoa Paddling of material with wader shag not be permitted. No froren material <br />or Iarge clods or stones shall be incorporated in the data The upstream face of the dam shall be eoastrticted with a slope not steeper than 2~:1, <br />and the downstream face on a slope cwt steeper than 2:1. She erect or top of the finished dam shall be not lac than 8 feet in width <br />The upstream two-thirtLs of the dam stall be constructed of the most impervious materials, such as clay bate, or a mamtty of clay and sand, <br />and the downstream one-third of mote pervious material, such as sand or gravel. The upsream face of the dam shall be adequately protected <br />against wave action by stone riprap, or other suitable tnateriaLs when required. <br />Otrtlei-There shall be located beneath the dam an ungated outlet pipe not less than 12 inches in diameter and large enough m drain within <br />dtirty-six hours airy impoundment in exms of two sae-feet Such oudet pipe shall be provided with cutoff collars. ISe pipe shall be placed in <br />a trench bottomed in stable formation, and shall be completely surrounded with well compacted impervious materials. <br />Spsllway-For the ptotec[ion of the dam, an adequate spillway shall be coasnvcted emuad one or both ends of the dam, of etrfGdettt width w <br />provide a capadty to nrrY the entire discharge from the drainage basin above the dam during periods of unusual runoff. The spillway shall be <br />located in stable formations not easily eroded, and shall extend to a point well downstream from the dam. The following table shall be used ro <br />determi^a the tuxessary width of splltay to meet the above rogt++++>"tAtts. The [op o[ the dam a[ all points shell be not lac than 4 feet above <br />the bottom of the spillway. <br />The following table shows the widths of spillways for correspotiditig drainage areas with an allowance of a minimum freeboard between the <br />vwdmum hig4 water line and top of dam, of 23 feet, and maidrnum velodties of 3S feet per second of time. <br />AREAS OF LOW RAINFALL lMENSffY AREAS OF H1GfI RNNFAfl IMENSIiY <br />ArfwaFtxwMOEew~ iaa7i~wonloFl;t~wAr ArFwocorwlAr~eA9t t®~wvmaF Ar~oFreAVr rm~wmHaF <br />ABOVEnw NAdF9 wA7 MNtAWFSt eONtN ABOVE trFONACi~ @RlNbtrwATtiYii71r6f AB01E nW N/OB Q+uxarwAT WlribNg'r <br />/$T Pne1r N t$t t01t N ti£T <br />p e zo X00 9 <br />b e b e ~` M <br />e0 11 e0 11 tM70 e0 <br />eo a e9 to 960 ere <br />im 1e 1m a eo0 +m <br />1~0 31 1T7 29 )m 117 <br />te0 ZS 10] 70 em 119 <br />120 Zo te0 SI e00 1b <br />1e0 ~] te0 77 1000 t'.10 <br />7m >S 100 U 11m te0 <br />150 b a0 b 1270 tee <br />goo a za so 17m t70 <br />L'10 M 2e0 t\7 t~00 ter <br />000 b 190 S7 1900 1e8 <br />e00 91 700 e0 1e00 Zm <br />700 06 7m e] 1700 111 <br />em y 71p N 1em 11Y <br />em ez 7m ro rem za <br />1000 88 790 7J 7000 137 <br />ALL AREAS EAST OF THE CONTINENTAL DIVIDE BELOW AN ELEVATION OF 7000 FEET, ARE CONSIDERED AS BEING 1N THE HIGH <br />RAINFALL BJIENSITY ZONE. <br />The above spillway widths may be reduced at a point SO feet below intake, by 25 percent, where the spillway is lanced the toll length thereof <br />in hard clay or shale, and by 50 per cent when looted in hard todt formations, if the slope or grade of the bottom is +~~a~ accordingly. The <br />grade for day and shale foraatiotss should be 0.30 foot per 100 feet, sad for rock formations 0.90 foot per 100 feet The width of the mtratre <br />ro the spiLtvay must is all uses be one-third wider than shown in the table, and the bottom should slope from the lower cad of the funnel sectiot;, <br />toward the resetwir 1.0 foot in the distance of 50 feet, and the slope downstream should be 0.25 foot in a distance of 100 feet <br />Botroltr P~-Piu, Irom which toatetials are taken to build the dam, s1aR be deamd of all vegetable matter, and tto material shall be borrowed <br />within a distanre of SO feet of any part of the dam without approval. Materials excavated from the spillway, when suitable, may be used is blaldimg <br />the dam. <br />
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