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. . . ... ,-.. -.'..-......:, -*: ..*:-
<br /> 'streams ' has standads for 2..nternn.*.' .. 'ttallt streams
<br /> - ,- .. - • • .8- --"-".' r. Carrboro also
<br /> 1 uhareas the CountY does hot.
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<br /> 2) Exceptions - this rule shall not apply A.n an.e.a4 othe,t than the
<br /> Umimmaity Lake Wateuhed where it can be demonstrated that
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<br /> stormwater discharge velocities will not create an
<br /> erosion problem in the receiving watercourse,
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<br /> 3) The following is a table of permissible velocity for stormwater
<br /> discharges:
<br /> [ —
<br /> i Maximum Permissible
<br /> Velocities For .
<br /> Fine Sand (noncolloidal) 2,5 .8 i
<br /> Sandy Loam (nonchlloidal) 2.5 .8
<br /> Silt Loam (noncolloidal) 3.0 .9
<br /> Ordinary Firm Loam 3.5 1.1 [ I
<br /> Fine Gravel 1
<br /> 5,0 1.5
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<br /> Stiff Clay (verylcolloidal) 5.0
<br /> Graded, Loam to Cobbles (noncolIoidal) 5.0 1.5 i
<br /> •• Graded, Silt to Cobbles (colloidal) 5,5 1.7
<br /> Alluvial Silts (noncolloidal) 3.5 1.1
<br /> Alluvial Silts (colloidal) 5.0 1.5
<br /> ..„
<br /> Coarse Gravel (noncolloidal) - 6.0 1.8 1
<br /> Cobbels and Shingles 5.5 1.7
<br /> Shale and Hard Pans 6.0 1„8
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<br /> Source: Adopted from recommendations by Special Committee on Irrigation
<br /> Research America] Society of Civil Engineers, 1926, for channels
<br /> with straight alignment. For sinuous channels multiply allowable
<br /> velocity[by 0.95 for slightly sinuous, by 0.9 for moderately
<br /> „.
<br /> sinuous channels, and by 0.8 for highly sinuous channels.
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<br /> Amended Effective [(December 6, 1978 and April 8, 1980)
<br /> Section 10 Borrow and Waste Areas
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<br /> When the person conducting the land-disturbing activity is also the person ,
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<br /> conducting the borrow and waste disposal activity, areas from which borrow
<br /> iS obtained and which are not regulated by the provisions of the Mining
<br /> Act of 1971, and waste areas for surplus materials other than landfills
<br /> regulated by the Department of Human Resources, Division of Health Services,
<br /> shall be considered as part of the land-disturbing activity where the borrow
<br /> material is being Used or from which the waste material originated. When
<br /> the person conducting the land-disturbing activity is not the person
<br /> obtaining the borrow and/or disposing of the waste,these areas shall be 1
<br /> i considered a separate land-disturbing activity.
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<br /> Section 11 Accessland Haul Roads
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<br /> Temporary access and haul roads, other than public roads, constructed or
<br /> used in connection With any land-disturbing activity shall be considered
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<br /> 1 a part of such activity. aLth kupect to deveCopmemt in the thavet.sity
<br /> Lake WateAshed, these access and hauC toads 4hace have gAavte pads paced
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<br /> at the en ttanc e a 6 the -Si.te, cS a taw(-de.4 tatbing act evity. I.
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