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III IIIIIIIIIIIII III 999 STATE OF COLORADO DNiSION OF WATER RESOURCES OFFICE OF STATE ENGINEER SPECIFICATIONS TO GOVERN THE CONSTRUCTION OF A LiVESTOCX WATER TANK Preparation of Fou~ation Ca Dam-All vegetable matter of every description, including toots ro a depth of two feet, shall be removed from the more area upon which the dam will resr, together with boggy or unsmble materials anti deposited outside the toes of the dam. The batch of the stream channel shall be dressed ro a slope of about 1}:1. A cutoff [retch, with sloping sides and a bottom vridth of not less than 5 feet and depth of 4 feet, shall then be exravated betreath the center line of the dam the full length thereof, which ttencb shall be teftlled with the mast impervious materials available. The foundation of the dam shall tiwn be lightly plowed lengthwise of the dam, to provide proper mama between the foundation and the dam embankment Plating of Dam t'..~M„4,.w,r_The materials shall be placed in the cutoff trench and in the embattlmm[ of the dam is layers not exceeditrg 6 inches in thickness, after which each layer shag be thoroughly compacted by a heavily loaded disc cultivator, a mtntgated or sheep's fmt roller, the treads of a caterpillar or trucks, or by livestock used in the coastrttctioa Daring the construction peiod, the top of the embank®mt shall be mainmined az a horiwnta! plane the full width and length thereof, and no side damping of materials shall be penmitted. The tnatenals shall at all rimes contain suffidm[ moisture to provide proper compaction. Puddling of material with water shall not be permitted. No frozen material or large clods or stones shall be incorporated in the dam. The upstream face of the dam shall be coaztrvcted wit);. a slope not steeper than 2;:1, and the downstream face on a slope not steeper than 2:1. The crest or top of the finished dam shall be not less than 8 feet in width The upstream two-thirds of [he dam shall be constnuted of the most impervious materials, such az clay loam, or a m~rn~w of da and sand, Y and the downstream one-third of more pervious taterial, such az sand or grovel. The upstream face of the dam shall be adequately protected against wave action by stone ripmp, or other suimble materials whm required. Outla~hould the Smte Engiaee so requite, there shall be located beneath the dam an outlet pipe not less than 8 inches in diameter, equipped with a control valve atmrhrri ro the upstream end of the pipe, together with suimble mxti~nkn, for operating the valve. Such outlet pipe shall be provided with cutoff collets. The pipe shall be placed in a trmclt bottomed is smbte formation, and shall be completely surrounded with well compacted impervious tnatetiaLs. Sptllvvny-For the protection of the dam, an adequate spillway shall be constructed around one or both cods of the data of suffidmt width to provide a capadty to carry the entire disclarge from the drainage basin above the dam dozing periods of unusual runoff. The spt7lway shall be located in smble formations not easily eroded, and shall extend to a point well downstream from the dam. Tbe followitg mble shall be used ro determine the necessary width of spillway ro [tree[ the above requirements. The top of the dam at all points shalt be not less than 4 feet above the bottom of the spillway. The following mble shows the widths of spillways for corresponding drainage areas with an allowattre of a minimum fteeboa~ between the matdmum high water line and top of data of 2.3 feet, and maximum velodties of 3.5 feet per second of time. AAFAS OF LOW RAINFALL /NIEIJSI)Y AREAS OF HIGH RAINFALL /NTENSRY AiEA OF [RWaACf BAa1 ~ wont oc SPLLwAr AiEA aF OtwurtE roar ti~OUF®wom 6 AfEA dF [rwutrse aISN i!®l1~ wont OF ABaYE ItAY N A669 w AT ilAfiaN6r FOIrr N ABOVE nNl N Aril® S71WAY W AT /NFitUAIEsT A®11E nAll N A(A3 SIRLWAT W AT (VARfOM6T Fffi POIVr N rgT iplr N FT£f a] 8 T7 B ~m B +o v w e aso tw m +t eo -+t sao w eo u m to sso ae too +e tao a coo ten uo xi izo x roo 11T ten a to oo coo txp pp0 as teb x coo tb ato a teb 0T taw t>o ono >s zoo u ciao ttp oso as ao .e rpm +w .w Az z+p so ixo to yp M 'tea y t<(a ttn 'AO b Spa 31 1~0a id! !00 S1 alp Ea 1E00 ~ T70A ]20 B] 1ra0 313 !00 7p ]b tb 1~ IItp pea Qp ]E0 r0 tpOp ?b 1000 BE apo ]J 2x00 paJ ALL AREAS EAST OF THE CONTINENTAL DIVIDE BELOW AN ELEVATION OF 7000 FEET, ARE CONSIDERED AS BEING IN THE HIGH RAINFALL IN'IENSilY ZONE. The above spillway widths may be reduced at a point 50 feet below intake, by 25 per cent, where the spillway is located the full Imgth theteoi in hard clay or stale, and by 50 per sett whm located in hard rock formations, if the slope or glade of the bottom is '++~++.~~ attrotditrgly. The grade for clay and shale formations should be 0.30 foot per 100 feet, and (or rock formatiotu 0.90 foot per 100 feat The width of the entrance to the spillway must in all rases beone-third wider than shown in the table, and the bottom should slope from the lower and of the tunnel section, toward the resetwv 1.0 foot in the distance of SO feet, and the slope dowttream should be 0.25 fmt in a dutatice of 100 feet Borrow P~-Pits, from which materials are taken to build the dam, shall be cleared of all vegemble matter, and no material shall be borrowed within a disrance of 50 feet of any part of the dam without approval. Materials excavated from the spillway, whm su;mble, may be used in budding the dam.