Agenda - 01-10-1994 - Laserfiche WebLink

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provide an adequate measure.Another drawback is that the BCR is only an approximation of actual site use. Substantial 77*Rewsed Am portions of a site may be occupied by parking and loading areas,and driveways. To br#W the pr»totype pkvn into Floor Area Ratio(FAR): Developed as a more accurate coma kwice mth the Desp?Manua(and measure of bulk,the FAR takes the number of stories into 34*0rft orc0irWnces and reports, the account;e.g.,it is derived by dividing the total floor area of a de ve4wr re vaes the An to YvL*the building by the area of the site or lot. Since a FAR (or B C R) Wowkv: of 1.00 is the same as a building covering the entire site, the measure would seem to be easily understood. However,it is — DeaLcatbn of 20 feet ofrapht-of-way difficult to relate FAR to real life projects. Like the BCR, the for the wh*rNrtq of Old N.C.Highway FAR does not measure the impact of parking and loading 8s. areas. —Alons entrance location to match pr000sed loca ibn of stgrWzed Impervious Surface Ratio (ISR) lntermbon, a mater access po#?t to The impervious surface ratio (IS R)is an extension of the And an the&trict on the east sale of building coverage ratio (B C R)and is the proportion of a site Old N.C.Hehway 86. covered by any surface or material which impedes or prevents A4gns exit locabbn to allow&7vers to the natural infiltration of water into the soil. Buildings, turn rightandprocad south or move sidewalks,driveways,and parking,loading,and exterior to tum A►ae for north oreastbound storage areas (paved and unpaved)are all examples of movement: impervious surfaces. Achieves same floor area as prototype pWn by provialM two two-story offte Locally, the ISR is a key element in watershed protection Duya VS instead of four one-story efforts.The rationale for its use is to keep significant amounts structures. of land in a natural or landscaped state to allow stormwater to — Ch&Ves desOn context from infiltrate into the soil,removing contaminants before they conterrlaorary style used lrr other reach water supply reservoirs. Accordingly, the maximum CDOWKnraitres to CobbnW,9evival Impervious surface ratio in each Economic Development style to mflecthisb*character of District is limited to the following: HftboroWh. MAXIMUM PERMITTED IMPERVIOUS SURFACE RATIOS With Without foul Detention Detention ED District Ponds Ponds 1-85/Buckhorn Road 0.70 0.12 1-40/Old NC ss NA NA Street Elevatbn I-e5AIS 70 0.70 0.24 w/C&G 0.36 w/o C&G NOTE: See Appendix C for discussion of detention pond standards. The steps used to calculate the ISR are almost identical to I those used to calculate the building volume ratio (BVR). Rather than duplicate calculations,an example of the I S R Panttri►ZQ LotElevatbn calculation for the case study site is presented on page 2.3.7 using BVR data. Economk Development Districts Des&n A4&%W PVC 2.3.3