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

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\ L (Page 3 . 6-4 , 5 ) cc=c1C r Gro'Je Natural Environmental Constraints Cedar Grove Township contains four natural environmental 077 constraints to development activity; floodplains, water supply watersheds; steep slopes, and poor soil conditions . Water Supply Watersheds: The headwaters of five; water supply watersheds, serving e distinct water s stems begin in Cedar Grove Township. The watersheds of Back Creek, U ii l �pe7� Frio, Little River', i hie vecr and :Sot co together cover almost 92% of"-the`Towns hip'`s total area Two impoundments on the Eno River downstream of the Township, Lake Ben Johnson and Corporation Lake, are the primary sources of water for the Town of Hillsborough and the Orange-Alamance Water System (OAWS serves Efland and portions of Mebane and Alamance County) , respectively. Upstream of those two impoundments, in Cedar Grove Township, is County-owned Lake Orange. L400rge is an augmentation reservoir from which water can be released..during low flow periods to increase availability of water to downstream users.::; le lJ : ark #< ,>::... :..:. . . :;.;:...; :•:.i::.;•i:•>:.i:.pro c s.::.>.::<€>W t::<::: `ork:: of::::the<::: o .:reservoir .. .. ' : : ::;+::5;:,:. ..;::i.:i:; ... :..': i....,. .;:..: .>: :..:.,.;::::i :•:.;:;.::::s ii x,::`:: :: :j: :i:;v. ;.;:;.::;::;>:;}}:: :::r;:<::xc<n•,:•:;•_: The headwaters of the North and South Forks of the Little River originate' in the eastern third of the township and flow into MDurham '{.:;:s.. `L a it tv.;:R l:e�•r:a:vrRiver .'...';.:{;::.....:.:•:..w v.v:. v•.•;.:-iia.i.p^,:aC:.:#'Dd;�>:u iv :iitFn'.:;:,::>yya i :.}:r<n i<; . :.i^;:.. .! :::portion 4 ; atrI : fNa t , : o: ester:u ^ ?i v :e The western third of the Township gives rise to Back Creek, which flows into the Back Creek Reservoir, a source ghowdatteorNxfGorahr4 and Mebane. Finally,. lte :., u yro G'1 ek the..:::�casa � ' .: i;:::: ::. : .,<.,. .. .::..;::: ::'. an i. : ...,.: :: ;.y.'.: ::??: ' •:^,:;c[ ...:C `;;:'?:"i.;a';:r ,roxw.,r,:.ro>: i'::<•:::<:.a:i:..>o-::::>.::::}}}:::::r;::i>i:;.}> .'''...u...••••••••••••••• Ros'#�r While these reservoirs do not directly serve Cedar Grove Township, '.t-hey do serve Township residents who work or shop in Graham, Mebane, or Durham. Water system interconnections and contractual agreements additionally create the potential for water from these reservoirs to serve Orange County residents. Floodplain: The majority of the Township's 100-year floodplain lies adjacent to five waterways; the North Fork and South Fork of the Little River, the East Fork and West Fork of the Eno River, and Back Creek. Because the headwaters of these streams lie in the Township, the stream valleys are relatively narrow and the extent of flooding during a 100 year flood is not great. Along Back Creek and the two forks of the Eno River the floodplain rarely exceeds 500 feet from the center of the stream and up to 800 feet along the two forks of the Little River. Floodplain covers approximately 8 .5% of the Township, some 4 ,430 acres . 4