Once this limit is reached with the impervious surface area, no … Typically refers to artificial structures, such as pavement (roads, sidewalks, driveways & parking lots) that are covered by impenetrable materials such as asphalt, concrete, brick, stone and rooftops. No building shall be altered nor arranged so as to reduce the size of any room or the relative area of windows to less than that provided for buildings, or to create an additional room unless it conforms to the requirements of this Rule. Square footage of house, including additions. The request is for approval of a deviation from the maximum allowable impervious surface limit. Lots between 9,000 and 12,000 sq. Common impervious surfaces include, but are not limited to, roof tops, walkways, patios, driveways, parking lots or storage areas, Posted at 22:18h in by grammymix. In short, it is a built surface that won't absorb rainfall, including roads, driveways, buildings, and concrete. When defining the area of imperviousness, statutory land use planning could make use of the maximum allowable roof square area and/or the maximum allowable amount of impervious surface coverage as well as reduce the need for surfaced passageways by placing the parking space and residential building centrally within the plot. TO COMPLETE THE MAXIMUM SQUARE FOOTAGE OF IMPERVIOUS COVERAGE ALLOWED ON A LOT, MULTIPLY THE PERCENTAGE ALLOWED IN YOUR ZONING DISTRICT BY THE TOTAL SQUARE FOOTAGE OF THE LOT (EXPAMPLE: A LOT MEASURING 7,500 SQ.FT. Additionally, if the property has an exceptionally long driveway, that portion of the driveway which is further than one hundred (100) feet from the residence shall be exempt. Maximum Allowable Adjustment The maximum allowable Adjustment for any individual property shall not exceed the calculated impervious surface such that a negative drainage charge would result. maximum allowable impervious surface area on the property to 25% and the applicants propose an impervious surface area of 28.6%. All Rights Reserved. patios, grade level terraces, driveways, walks, parking areas and … Minimum horizontal dimension of courts and yards shall be not less than two m. all inner courts shall be connected to a street or yard, either by a passageway with a minimum width of 1.20 m or by a door through a room or rooms. Impervious surfaces are those surfaces that will not allow or will greatly reduce the penetration of water into the ground. General. ft. would be allowed 50% impervious surface. ... MACA. 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.6.1. The maximum allowable impervious surface area is between 1,000 sq. It matters because the City of Austin has maximum amounts of impervious cover allowable on a lot. Categories R-1 R-2 R-3 C-1 Where both lot- and plat-specific impervious limits apply, the more … summarize impervious surface areas and percents by land use zoning district and watershed. Every court shall have a width of not less than 2 m for one or two storey buildings, however this may be reduced to 1.50 m in case of quadruplexes, rowhouses with adjacent courts with an area of not less than 3.00 sq.m. Toilet and bath rooms and laundry rooms shall be provided with window with an area not less than 1/20 of the floor area but not less than 240 sq.mm. Since the subdivision was approved for a certain maximum amount of impervious surface, the transfer must be between lots within that subdivision.Another option would be to remove existing impervious surface to account for proposed additional impervious surface. Portola Valley, CA 94028 Impervious surface of roads need not be counted towards the allowable impervious area. Minimum sizes of rooms and their least horizontal dimensions shall be as follows: Rooms for human habitation “ 6.00 sq.m. 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. Additionally, the amount of adjustment provided for green roofs and porous pavement shall be limited to the surface area of these Each zoning district has a maximum impervious surface percentage that is allowed. WITH A 40% ALLOWABLE COVERAGE WOULD HAVE AN ALLOWABLE MAXIMUM IMPERVIOUS COVERAGE OF 3,000 SQ. 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. C. Square footage of carport/garage. How many and what kind of buildings can I have on my lot? 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. Buildings and roofs are exempt from being counted as impervious surface unless the roof overhangs exceed (6) feet in width. Roads and drivewa drivewaysys outside of the develo the developmentpment area have alread area alreadyy been accounted forbeen for,, and therefore will not and therefore will affet the maximum allowable impervious surface within the development area. How many and what kind of buildings can I have on my lot? Maximum Allowable Construction Area (MACA) “ the combined total of the Maximum Allowable PSO and the Maximum Allowable ISA. IV. You can determine your impervious surface limit by using the following formula: * Remember to only use the area … Please enable JavaScript in your browser for a better user experience. Additional Information for Emergency Preparedness, WPV Neighborhood Emergency Response Teams, Sanitary Sewer & Septic System Information, Construction and Landscaping Hours in Town, Demolition Permit Application Requirements, Understanding Floor Area and Impervious Surface, 2014 Housing Element Process and Meetings, Town Requirements for Selling Property in Portola Valley, California Building Code Chapter 7A (CRC - R327) & Fire Hazard Study, Geologic & Ground Movement Potential Maps, Walking on [Hot] Water With Radiant Hydronic Heating, Supplemental California Native Perennials, Supplemental California Native Ground Covers/Lawn Substitutes, September 23 - Water-Efficient Irrigation, October 28 - From Lawns to Meadows & Using Native Plants in Your Garden, March 13 - Be Energy Efficient in Your Sleep, April 10 - Backyard Beekeeping & Beneficial Insects, September 11 - Blue is the New Green: Water Harvesting and Conservation, October 9 - Eating Local: Benefits that Extend Beyond the Palate & the Plate, Town Council Meeting Summaries and Zoom Recordings, Bicycle, Pedestrian & Traffic Safety Committee, Cable & Utilities Undergrounding Committee, Open Space Acquisition Advisory Committee, Woodside Highlands Road Maintenance District Residents’ Advisory Committee, Portola Valley Town Center Construction (#1), Portola Valley Town Center Construction (#2), Portola Valley Town Center Construction (#3), Portola Valley Town Center Construction (#4), Portola Valley Town Center Construction (#5), Portola Valley Town Center Construction (#6), Portola Valley Town Center Construction (#7), Portola Valley Town Center Construction (#8), Portola Valley Town Center Construction (#9), Portola Valley Town Center Construction (#10). Town Government, 765 Portola Road FT.) The maximum allowable amount of impervious surface within a proposed development is limited based upon the Low or High Density Option, and differs from Watershed to … FT. If exceeded, the Allowable Maximum TGFA must be adjusted since the AMVB must always prevail. Exception: Lots may exceed maximum impervious coverage by 10 percentage points above Maximum Allowable Unpaved Surface Area (USA) “ portion of the lot that shall remain unpaved and reserved for softscaping/planting. Note: The 52,080 square feet of allowaable impervious suface is within the development area. Mezzanine floors shall have a clear ceiling height of not less than 1.80 m above and below it. Again, the remaining 15% of the allowed maximum floor area allows for construction of desired accessory structures. Minimum Requirements for Total Open Spaces within Lot (TOSL). Impervious surface under existing (2005) conditions 2. maximum allowable ISA consists of build-up areas within the lot connected to the main building/structure but without opaque or solid roofing, e.g. Group A buildings or Residential 1 (R-!) You can contact the Development Services Center for more information. The upper limit on residential lots is 30% impervious; however, subdivisions may range from 6% to 30% impervious depending on the level of stormwater treatment installed during development. Lot Area B. with a least dimension of 2.00 m. Kitchen “ 3.00 sq. Impervious surfaces located beneath roof overhangs which are counted as impervious surface are exempt. 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. Understanding Your Property's Allowed Floor Area and Impervious Surface Areas, Press Enter to show all options, press Tab go to next option. TO COMPUTE THE MAXIMUM SQUARE FOOTAGE OF IMPERVIOUS SURFACE ALLOWED ON A LOT, MULTIPLY THE PERCENTAGE ALLOWED IN YOUR ZONING DISTRICT BY THE TOTAL SQUARE FOOTAGE OF THE LOT (EXAMPLE: A LOT MEASURING 7200 SQ. Tryphena) on other land units or settlement areas that are 2000m2 or less. means the maximum area of a single building site that impervious surfaces may occupy. Once this limit is reached with the impervious surface area, no … the total open space required for each type of use or occupancy for a given lot. Porous paving, paver blocks, gravel, crushed stone, crushed shell, elevated structures (including boardwalks), and other similar structures, surfaces or improvements are considered impervious cover. 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. "Adjusted" refers to the inclusion of this data in the computation that produces an "adjusted lot size" and the "adjusted" maximum floor area. Total Area (Acres) Low Impervious Surface Estimate (Acres) High Impervious Surface Estimate (Acres) Forest Resource Lands 393 10 10 Incorporated City 10,663 2,495 2,495 Industrial 37 26 26 Lake 468 2 2 Rural Protection 5,139 2,281 2,281 Rural Residential 64 52 52 Rural Wooded 99 0 0 Elgin 2,194 73 73 Business Center 590 36 36 Define Impervious surface, total allowable coverage. Impervious Surface means a surface that because of its composition and/or its use impedes the natural infiltration of water. ft. and 4,000 sq. USA. Sustainability | The 85% calculation for floor area regulates the mass of the residence including first floor/second floor and required off-street covered parking (2-car attached/detached garage or carport). ft. would be allowed up to 60% impervious surface. Three different scenarios are evaluated: 1. It matters because the City of Austin has maximum amounts of impervious cover allowable on a lot. Define Impervious surface, total allowable coverage. 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. impervious cover. 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