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<br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />Pressurized Dual Water S\stellls <br /> <br />This report covers a OIH.'.year investigalinn of the pn..'sent and potential tx'nelits and costs of <br />pressuri/ed dual water systems in Colorado. Pressurized dual water s)-slems arc char.lcleri/ed b)-' two <br />separate underground piped water systems serving a residential parcel of land or lot. ()ne water sySh.'1lI <br />conveys lreated water for household use. \\hik thl.' othl.'r pipl.'d systl.'1lI coml.')s untr~'ated wall'r Iilr <br />landscapl.' irrigalion (Figure ::!). I)otentially dangerous cross connectitms ar\.' avoidl.'d through propl.'r <br />installation procl'dures. pipe and poinl-of-connection idl.'ntifil.'rs. and s(llTletilllcs a l(mcr supply pressure <br />gradil.'nl for lhe untrcatcd sr.tell1. For this rcport, wc arc dclining the pressurized piped system for Ihl.' <br />untreated \\3ter as thc residential parcel/lot's "secondary waler supply," This term is used fre~uent]y in <br />other areas of the West where \\ell-d,,'\'c1orw:d pre'isuri/ed dual water sY'itcms of this nature arc already in <br />operation. The tenns "dual water system:' "secondary' water supply:' and "noll-polahk \\aler supply" arc <br />used interchangeably hl.'rein to describe these discrete water systcms. <br /> <br /> <br />Much h,IS rl.'cently hl.'en \\rillen <br />on dual syslems.1 The unique Iilclls of <br />this study. ,ompared 10 lllh..'r recent <br />studies on dual systems. \\as 10 I.'valuate <br />Ihe potential mle of traditional <br />agricultural water suppliers (mutual <br />irrigalion l'Ompanies and irrigalion <br />distril.'tsl in providing this sl',onJ:Jry <br />waler supply' service to residential. <br />comnll.'rcial and imtitutional outdoor <br />water USl.'rs, particularly in <br />lInin,orporated areas or annc\ed rural <br />areas. but abll in lOOI11..' inncr-dty, arca." <br />Inner ,it)' situations \\ould nl'cess:lril} <br />iO\olvc retrofiHing l.'\isting hOIlll.'s and <br />businesses wilh an additional prl.'ssuri/ed <br />S}stl'm for lhl.' sl.'condary wall.'r supply. <br />rhis is Ocing done in several communities in other areas of the Rod,) MnU11lain rl.'gion. sll,h ,IS Narnpa. <br />Id,lho, and Kaysvillc, Roy, Coalville. Midway and Hurricane. Utah. Smnl.' retrofit e\amplcs \\ill bl.' <br />disCllSSl.'d in a later chapter. Ilo\\ever. the study has fOl."llsl'd mor\.' on thc lISl.' of secondary \\ater supply <br />in future residential subdivision dl.'vclopml.'nt inunincorpmaled areas. Hlcse arc Itlcalities \\here <br />tr,<lditional agri,ultur.tl water suppliers ~'ould provide pressuri/ed untreated watl.'r reasonahly, <br />ec.:onornic:lllr. and safely (Figure 3l- <br /> <br />Thc]Ofllclcana]C<1mpan,...,nllulalca <br />arccc'l1.a,nhr/l",ul"Uf'olt>lclIf <br />1"""d'nll~{tndar.".(...,ll'Inc" <br />'Uhd''''ldon. <br /> <br />, . <br /> <br />l'ilWn: J - Jrrigalilln Canals Adja~...nll(l N\'\\ K~siJ\:nlial ^TI.~a.~ <br /> <br />Figure 4 shows the lypical wnliguration of irrigation l'ompany sen ice ar..'as along the CnloTildo <br />Front Rangl'. Urban dl.'velopment atfecting th..'se cnt,rprises inl'1udes l'<oth typical residl.'ntiallots in <br />incorporated arl.'as. as well as a growing pnpularit) in larger hllbhy farm ac.:reagl.' throughoUllhl.' <br />uninwrpurated arl.'as. Ihe pOlential of the irrigation company in Figurc 4 10 providl.' prl'ssuri/cd <br />irrigation watl.'r to rl.'sidellliallots is cOllsiderable. givcn its I{l(ation in the urhan corridor of northl.'ast <br />Colorado. It is argued thaI. by providing sl'condary \\ater service. the IOi.:al irrigation company or <br />irrigation district could bcnclitlinancially. This lin:ll1cial bendit would hl.' in thl.' form ofmodl.'st re\l.'lllll.' <br />from the prnvision of sl.'cllndary service. this rl....'cnlle thl'n being used to upgrade e\isting agricultural <br />watcr delivcry facililies. This would hl.' a"ulTlplished in such a way as not II) l.'ndanger thl.' non-protit <br />status ofthl.'se enterprises, since rl.'venue eatnl.'d through sel'ondary service is an assessmcnt nil the \\atl.'r <br />right. Residl.'lltial wal..'r users. as \\1.'11 as thl.' stale, could hl.'nefit cnorll\nusly as \\c11. through IllOTe <br />efficicnt use of native \\,lIcr supplies. <br /> <br />, <br />