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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />".,... <br /> <br />, . <br /> <br />are required when the other parts of the :Initial system, priJJBri.ly curb am gutter, IK> la1ger <br />have CBJIlCity for additi.mal. nmoff. A good DB jar dralnage system coopled with efficient layoot <br />streets, can often reduce the size of an :Initial storm sewer systan. <br /> <br />Stann sewers am inlets shall be of sufficient CBJIlCity to adequately carry the expected <br />runoff fran the 5-year storm. The stann sewer systan and subsequent stann inlets sha1l ~...e <br />at all locations where the alla.able street caprity is eJ<<:eeded or IIhenever pcn:Iing of water is <br />1ikel y to occur. No bubblers will be al.lo.oled. <br /> <br />Arrj sewer system shall consider all other develolJll!llts within a basin both existing and future <br />am sha1l be designed to handle all flows and COINey them safely to the river. <br /> <br />a. Stann Sewers. The mini.nun allO\lBble pipe size to be used in stann <br />sewers and laterals shall be as listed in Table 1.4. <br /> <br />Art:h pipes will be all<M:!d. where design cooditions dictate, provided, oo.ever, the mini.nun <br />cross-sectiaJal areas sha1l not be less than tOOse specified in Table 1.4. All stann sewer <br />conduits sha1l be of sufficient stroctural strength to withstand an AA9IID design 1ood. <br /> <br />totmholes will be required IIhenever there is a clmge in size, directiro, elevation, grade <br />or where there is a junction of boI:l or JlDI'e sewers. In additiat, the DBXinun spacing between <br />1lBIlIx>1es for various pipe sizes sha1l be in aa:ordaoce with Table 1.5. <br /> <br />TIE caprities of conduits sha1l be canr.uted using t1mning' s Fonw1a or appropriate flow <br />IU1tlgIdphs. The value of the roughness coefficient (n) to be used shall not be less than those <br />specified in Table 1.3. The average fu11f1ow velocity in cmduits shalloot be less than boI:l <br />fps. <br /> <br />Vertical Aligrmmt <br /> <br />TIE sewer grade sha1l be such that a mini.nun CDVer is IlBintained to withstand AA9IID H-~ <br />looding on the pipe. the mininllIn cover deperrls upon the pipe size, type and class, and soil <br />bedding conditions, but sha1l not be less than me foot at any point aloog the pipe. <br /> <br />TIE minin1IIn clearance betloe3l storm sewer am water nain, either above or below, shall be <br />12 inches. Concrete eJl~"'''''""'''lt of the water line will be required for clearances of 12 inches <br />or less for a mini.nun of ten feet on each side of 1ItJere the storm sewer crosses. <br /> <br />TIE minin1IIn cleararce lJet\..t!en storm sewer and sanitary sewer, either above or below, sha1l <br />also be 12 inches. Ib<ever, when a sanitary sewer IlBin lies above a stann sewer, or within 18 <br />inches below, the sanitary sewer sha1l have an ~ous €IlCaSEIIeJlt or be constru:ted of <br />structural sewer pipe for a mininun of ten feet at each side of where the stann sewer crosses. <br /> <br />Ikriza1tal AligIllll!11t <br /> <br />Swnn sewer aligIllll!11t lJet\..t!en mnho1es sha1l be straight, except ..rere approved in writing <br />by the Town. Stann sewers my be const:rU:ted with an:vilinear aligment by the pul1ed- joint <br />J1etrod, pipe bmIs, or by radius pipe. TIE limitation on the radius for pulled-joint pipe is <br />dependent on the pipe length am cli.aneter and 8IlDUIlt of opening permitted in the joint. The <br />JIBXiJm.un a1J.oI.able joint pill sha11 be 3/4 inches and is subject to prior approval. The radius <br />requiraJents for pipe benis in deperrlent upon lIBIWfacturer' s specificatioos. <br /> <br />9 <br />