... FT> would have a maximum allowable impervious surface of 2880 SQ. Impervious Surface Page 3 Lots up to 9,000 sq. TOSL. Buyers sometimes think they do not need one because it is obvious where the property lines are located or they have a copy of an older survey. VIII.6.2 to VIII.6.5). FT. Porous paving, paver blocks, gravel, crushed stone, crushed shell, elevated structures (including boardwalks), and other similar structures, surfaces or improvements are considered impervious cover. For guest parking areas, the Planning Commission has approved a specific paving cell product called GeoBlock, that when used, will only count for 50% of its area as impervious surface, hence providing some relief for properties that are close to reaching their maximum allowed impervious surface area. Maximum Allowable IMPERVIOUS SURFACE AREA (ISA) “ percentage of the maximum allowable floor area of any paved, tiled or hardscaped surface at the ground floor in relation to the TLA. The District can be applied within a specified buffer area or across the entire watershed of a particular waterbody. impervious surfaces increase, stormwater runoff increases in quantity, speed, temperature, and pollutant load. These surfaces include concrete, asphalt, bricks, paving stones, swimming pools, "turf stone," plastic sheeting, compacted gravel and rock areas, any gravel or decomposed granite areas/paths wider than 4', corrals, and similar surfaces. The applicant is requesting a deviation that would allow for the lot to be covered with Such windows shall open directly to a court, yard, public street or alley or open watercourse. The Town's Zoning Ordinance (18.48.010) requires that the floor area of the main residence combined with the required covered parking not exceed 85% of the property's adjusted maximum floor area (AMFA). Categories R-1 R-2 R-3 C-1 Following the above is the current impervious ground formula: Total sq ft of imperv area / ( lot area in acres * 43,560 sq ft) = % impervious surface Plugging my numbers into the above calculation returns: 3,060 / 40,075 = 8% Every home under his jurisdiction that’s not in a watershed has an impervious surface limit of 30 percent, meaning only a third of the property can be covered by a hard surface. Lot Area B. Pollutants, such as oil and chemicals, deposited on these surfaces wash straight to creeks and lakes in runoff during rain events causing negative water quality impacts. This is the percentage of total area managed by BMPs: 950 square feet ÷ 1,000 square feet = 95% Step 3: Multiply the percentage found in Step 2 by the maximum allowable discount of 55%: 95% × 55% = 52.3% IV. Impervious surfaces include the building footprint plus all surfaces that prevent rainwater from entering the ground. Maximum site occupancy shall be governed by use, type of construction and height of the building and the use, area, nature and location of the site and subject to local zoning requirements. The additional 15% of the allowed floor area for the lot allows for accessory structures (i.e., cabana, pool house, shed, guest house, etc.). Because impervious surfaces are such a danger, many governments, like the City of Louisville, Kentucky, charge landowners with high amounts of impervious surfaces on their properties. The required open space shall be located totally or distributed anywhere within the lot in such a manner as to provide maximum light and ventilation into the building (Fig. Property Description: Lot Dimension Lot Area 100'X100' 10,000 square feet How to Calculate Building Coverage Percentage Structure Dimension Square Footage on the lot divided by the total lot area. Buildings include, but are not limited to, residences, garages, carports, guest houses, cabanas, greenhouses, sheds, etc. Lots greater than 12,000 sq. Every home under his jurisdiction that’s not in a watershed has an impervious surface limit of 30 percent, meaning only a third of the property can be covered by a hard surface. The city also has maximums for building coverage, defined as the area of a lot covered by buildings or roofed areas, with some exceptions. Impervious Surfaces. Understanding Your Property's Allowed Floor Area and Impervious Surface Areas, Press Enter to show all options, press Tab go to next option. EXAMPLE 2 Dwelling additions of 100m2 In this example adding an additional 100m2 mto the existing 250 2 dwelling would result in a total floor area of 350m2 which is under the maximum floor area limitation for this size allotment. Sustainability | Impervious cover – Any structure, surface or improvement that reduces and/or prevents absorption of storm water into land. Impervious surfaces on a lot include, but are not limited to, building driveways, garage, porches, patios, private walks, accessory building, and any other impervious surfaces constructed on the lots. FT. WITH A 45% COVERAGE WOULD HAVE A MAXIMUM ALLOWABLE IMPERVIOUS SURFACE COVERAGE OF 3240 SQ. Impervious surface under existing (2005) conditions 2. The Zoning Ordinance does allow for second units on parcels of one acre or larger. Again, the remaining 15% of the allowed maximum floor area allows for construction of desired accessory structures. Buildings and roofs are exempt from being counted as impervious surface … The Allowable Maximum TGFA should not exceed the Allowable Maximum Volume of Building (AMVB). Impervious surface under existing (2005) conditions 2. See Tutorial. 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