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. . <br /> 147 <br /> TRIANGLE J COUNCIL OF GOVERNMENTS <br /> -.A 100 PARK DRIVE P.O.BOX 12276 RESt•ARCII TRIANGI.1- PARK.N C 2770,) MN)4444t;i I <br /> — <br /> FALLS/JORDAN LAKES - PROTECTION THROUGH UNIFORM LOCAL GUIDELINES <br /> February 9, 1984 <br /> I. WATERSHED-WIDE GUIDELINES - NRCD guidance included recommendations <br /> . for stormwater control and stream buffers that would apply throughout <br /> the Falls and-Jordan watersheds: <br /> A. Stormwater Management. - For all new development, control the <br /> • • first 1 inch of stormwater runoff from all impervious areas. <br /> In order of preference, stormwater control options include: <br /> 1. Onsite infiltration through undisturbed vegetated areas. <br /> .1% <br /> ri::::=5 • 2. Structural, or engineered infiltration measures such as <br /> infiltration trenches or retention ponds that reduce the <br /> i-1,4i ti total amount of runoff. <br /> tr-:-.7-Ye•-•zy <br /> •14,1) <br /> 3. Detention structures that reduce the rate - but not the <br /> total amount - of runoff. <br /> (December 2 guidance from NRCD suggested that new development <br /> in existing urban areas (defined by municipal boundaries ) <br /> 4...:...... not be subject to Stormwater Management requirements and <br /> Arimmik. , impervious surface limits. Local decision makers may <br /> - . wish to reconsider that exemption in light of the flexibility <br /> suggested by this present package. ) <br /> B. Stream Buffers (applicable in all areas) - For any new development. <br /> maintain 50-foot vegetated buffers along both sides of all <br /> perennial streams. Minimize the direct discharge of runoff <br /> through ditches, culverts, or along roads crossing the natural <br /> buffers. • <br /> 1 <br /> 1. "Perennial Streams" are indicated by solid blue lines on <br /> USGS 71-minute topographic maps. <br /> 2. Fifty-foot distances would be measured from the edge of <br /> streambanks. <br /> . . 11. WATER QUALITY -CRITICAL AREAS <br /> A. Purpose - To provide a special level of protection <br /> to areas critical to the water quality of the lakes. Suggested <br /> limits on impervious coverage, stormwater control , and non- <br /> residential development can reduce the effects of runoff and <br /> • lessen the chance of wastewater system failures and chemical <br /> • • <br /> APIX ° BENSON • BROADWAY • CARRHORO • (AR • CHAN I IIHI Ft <br /> • CLAYTON • DURHAM • FOUR DAIS • INCAYNARINA 0 GARNIR Illip <br /> GOLDSTON • HILLSBOROUGH • HOLLY SPRINGS • 1.1 NI'1 • KNIGIIIII%1 I <br /> MICRO • MORRISVILLE • PINI LIVE, • nristoRo • PION+ i loo <br /> RALEIGH 0 ROLLSVILLE • SANI ORD • SI I m% 0 SII I K CII% <br /> SMITHFIELD • WAKL FOREST • v.I Pox II • /1 m ins 1 7 \ <br /> CHATHAM COUNTY • DURHAM COUNTY 6 JOHNSIOX COMIN <br /> LEL COUNTY • ORANGI COUNTY 0 • WAk1 tOVNIN <br />