Agenda - 08-23-1993 - C 1-4 - Laserfiche WebLink

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07j (Page 2 . 3-12 ) this treatment process is so high that extreme financial burdens could be placed on smaller systems. Orange County is fortunate that its public water suppliers draw water from upland supplies contained within the County. University Lake Watershed is the most developed of the six water supply watersheds in the County, located just west of Chapel Hill and Carrboro. The watershed, along with the Cane Creek 'watershed, is classified by the North Carolina Division of Environmental Management as WS-g, meaning it is relatively undeveloped and has no point source discharges of pollution. Of the 19, 600 acres in the University Lake watershed, only 8% is considered developed. The watersheds of the Little River, Back Creek, Upper Eno and South H co watersheds are :<o. $:.' ::.:.s : :::,,.,, Y � �:.., �.�� '� #t<y��,.}:.�.�.;;;;:;; rural in nature and free from potential '''concentrated.-scurces'. of•"`pollution. <DELETED> Durham has requested a WS-I classification for the Little River and Flat River watersheds, while Graham-Mebane has requested a WS-II classification for the Back Creek watershed. The projected water quality, from these watersheds is expected to be good.<DELETED> The Flat ..ver watershed has �e ved a: . :• }'.::<}� i ,::,:}<:...,.,> ,;.:::::«;..::.;: .e :::Mpgi•�e.** n. t;.;<;> ie:}:;:: . Vii.. s;:-}':a�f.:;•}:• ::::. «<:: . 0..:....:.....g,..:......... .....:.:::�:: .�:.�:::.v.........:.i............::.::• ;:n':{:L:•is4:Si:•ii};:n::.::r...............:..:.::::: : :::::.:.::::::.v:::.:....:.............:•.::.:..:�::.�.�:.�:•.�:::.:�:-:w........ �y�y ��• y�. ........:.:::: ..�:::.�::.........�.....:...� L::::::;:��F.� tii'::;:Iti$M.�fii'� .•:::::t:::: ��j' ` �'. ."•: :rr':•':. y' ::�:i�y"' •. :n�.:�:- " �.;..::::•::.::v;..:.:. .... .>.::w:::.:.:::.::..::.�:. v:.:v.' .::.�^:}::}.v:•:•r.:.:.:..:•.v::::.�::r:.:.�..:}.......:.....r.�n�:v::::::•.;•.:.�:::..�•�.� r.:.....n...::::::::::.:.�:::�::•::•::.�v�:.::x:v:........ . �... :• .: :}..:' ::;•i}: '. •'••}}:.:.:. ....:...ti.;.. .� ..:...}},,}.. ::.....:...:..:::{.:. .::.;.:;?i•}::i•; :�:::::.}::{.: ':::::..;':::!:!.}:•}ii::-}:ii: }+::•::...i'::::iii:'}::}::v}}..:...::i 'i�:i}: 1o.h cx 8::::sr a:'>:>:::fo..,.n<?#,eel • . .::;.:.g :;.'::::-water•:: " :}:i:•i:;_;.} ti�:n::�:(:: $}:::i};y;:;:¢$.''::i:::i$:}}}':�:-••:'•i::•:'r"^:^;:•::::••{•}:::.:.:::ti:0}}i}':•.:: }:::•:::}i}::<::J:i: ':v:p;}:•i::iv};•}}:0•;}:rS::�::v}:::.:::.}:::.i:.}:�:?::::}i:i:•}:•. .. ...... .....::.::.::.:...t•}:c:::.,•:.:•;..;.::,:%w.;v,;;sr'ix:::r.%;.:}:;':<i•};2..:us:o':.::::.::::,.:.:.:.:.,.,.t.::::::.,.:::>.>? :sx::;:•':;.:c.:::::,:::}:; .}:: Watershed Classification Table The sources of pollution which have been discussed so far, are called "point sources" of pollutants. Point source refers to pollutants from a specific fixed source which enters the water at an identifiable point. An example would be the outfall pipe from a sewage treatment plant. Other sources of • pollution are called "non-point sources. " These are pollutants which reach receiving streams in a diffused manner and cannot be attributed to an identifiable or specific source. An example would be the pollutants that accumulate on a parking lot or road and are washed off in a storm. Studies around the nation have revealed that non-point sources of pollution are equally, if not more important, contributors to poor water quality than point sources . The same studies reveal that non-point source pollution generation is a function of land use. Areas which are mostly forested have the lowest amounts of pollutants in the water that runs off the land. This is because forested areas have a greater ability to slow runoff and assimilate pollutants present in the runoff and lack the urban activities, such as concentrated automobile usage, that produces pollutants. In a forested area, only a small percentage of the precipitation washes off the land into the nearest stream. The ground cover in forested areas slows the velocity of runoff and allows water to