supra note 128 (describing original proposal to limit effective impervious surface area to 10%); see Ervin, supra note 127, at D1 (reporting on proposed modifications to the Ordinance that . Height Limit Lot Width Maximum Height Greater than 30' 30' 30' or less 25' Small or irregularly shaped lots may be limited to 18'. NGPE, or other condition which limits the amount of developable area. SURFACE WATER . To determine if impervious surfaces have been added since Site Areas Worksheet, continued 6. Any subsequent changes to the attached interlocal agreement shall be submitted to the King County council for review. Exception: The 10 percent limit may be exceeded if: The maximum lot coverage allowance of LUC 20.20.010 is not exceeded. Journal of the American Water Resources Association 33, 5: 1077-1090. IMC 18.07 contains the District Standards Table, which has pertinent information on setbacks and impervious surface based on your zoning in the greater Issaquah area. 2. Impervious surfaces are items that prevent water from penetrating into the soil, such as driveways and rooftops. Section 1.1 Drainage Review 1-11 . Impervious area is the amount of surface area that water cannot penetrate. Parks has negotiated a 27% limit on impervious surfaces within the property lines (the fund normally limits to 15%; the extra is taken from the parcel to the north). Common impervious surfaces include, but are not limited to, roofs, walkways, patios, driveways, parking lots, storage areas, areas that are paved, graveled or made of packed or oiled earthen materials or other surfaces that similarly impede the natural infiltration of surface water or stormwater. Surface water design manual. Impervious surfaces are items that prevent water from penetrating into the soil, such as driveways and rooftops. As required by this manual, development projects that create more than 2,000 sf of new and/or replaced impervious surface must evaluate LID facilities to the maximum extent feasible and include amended soil in all landscaped areas. Article II. A maximum of 35% of some lots in residential . Parking facilities, and other surfaces subject to vehicular use, are assumed to be pollution - generating impervious surface. The second filtering process is the maximum number of iterations possible without dramatically altering the Impervious Surface Area (ISA) distribution. This addendum to the 2016 King County Surface Water Design Manual (KCSWDM) applies to . 3. CSO Combined Sewer Overflow Constructed conveyance system facilities Include street lights and fire hydrants. Minimum 12,000 SF lots. Maximum Impervious Surface Limits for the Property. Public agency or utility office permitted only as a re-use of a public school facility or a surplus nonresidential facility subject to the provisions of Chapter 18.50 KMC. Surface Water Utility Purpose and Responsibilities. Section C.3.7 Vegetated StripVegetated Strip C-118 . mitigate runoff from target impervious surfaces. 15.52.030 Comprehensive drainage and storm sewer plan. Common 128 impervious surfaces include, but are not limited to, roofs, walkways, patios, driveways, 129 parking lots, storage areas, areas that are paved, graveled or made of packed or oiled Ordinance 16264 7 130 earthen materials or other surfaces that similarly impede the natural infiltration of surface 131 and storm water. . The structure may cover up to 10 percent of your lot and must be included in the calculation of lot coverage and impervious surface for compliance with the maximum allowances for your district, as found in LUC 20.20.010. Lot Coverage: The percentage determined by dividing (a) the area of a lot covered by the total (in square feet) of: (1) the footprint of the main A maximum of 35% of some lots in residential . Join us on January 20th for Washington REALTORS Virtual Legislative Days when we . Step 4: . The streets, while providing 15.52.020 Purpose. urban development on aquatic systems; to review the history of surface-water management in King County as it relates to the analysis and mitigation of those consequences; and to evaluate the basis for a specific proposal, first explored almost a decade ago, to limit effective impervious areas in Google Scholar . plaza, connection to King County improvements and will reference the South Park Green Space Vision Plan. See King County's Surface Water Design Manual website for additional information and updates. Examples of impervious surfaces include sidewalks, driveways, roofed areas (houses, porches, etc. Include the King County recording number for existing easements. How can I check the status of my site development permit? (2) Affordable housing defined. Third, the Sims decision does not prohibit clearing limits. Once this limit is reached with the impervious surface area, no further development can occur on site. Island County's Shoreline Master Program (SMP) regulates shorelines, including all marine waters surrounding Whidbey, Camano, and smaller islands, and lakes 20 acres or larger. The following steps help create impervious features cluster to what is visually distinguishable without increasing commission error. Impervious surfaces are items that prevent water from penetrating into the soil, such as driveways and rooftops. If yes, describe how there will be no net increase in the rate and volume of stormwater surface runoff. Apartments are prohibited. KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL, APPENDIX C 47/241/20162021 2016 2021 Surface Water Design Manual - Appendix C Section C.3.8 Triangular Silt . The second filtering process is the maximum number of iterations possible without dramatically altering the Impervious Surface Area (ISA) distribution. In 2016, the City of Kirkland adopted the 2016 King County Surface Water Design Manual (KCSWDM). or other surfaces that similarly impede the natural infiltration of surface and storm water. King County Water and Land Resources Division 201 South Jackson Street, Suite 600 Seattle, WA 98104-3855 Rhett Jackson Daniel B Click here to load reader Post on 22-Aug-2020 Overall non-vegetated surface extent will be quantifiable by summing those areas in this category with those in the Impervious-Constructed Surface category. All other office uses are prohibited. 17.04.120 Maximum Lot Coverage A. Definitions: 1. Drainage review is required for any proposed project (except those proposing only maintenance) that is subject to a King County development permit or approval, including but not limited to those listed at right, . 12. Parcels classified as forest land by the state are exempt from the SWM fee. King County Surface Water Design Manual (KCSWDM), chapter I, section 1.1.2, "Full Drainage Review" as . Utilities: Include the location of all existing and proposed utilities below and above the ground. Identified by King County Assessor tax parcel number 409710-0055 SEPA Determination: The proposal is categorically exempt from SEPA pursuant to WAC 197-11 . . (3) Modifications. 19.110.010 Affordable housing regulations. King County Water and Land Resources Division. To verify whether you are being billed correctly, call Water and Land Resources Division customer services at 206-477-4800. As required by this manual, development projects that create more than 2,000 sf of new and/or replaced impervious surface must evaluate LID facilities to the maximum extent feasible and include amended soil in all landscaped areas. 5 Tree Preservation 30% of all protected trees (see Section 8: Definitions) shall be retained on site. The 15.52.010 Surface water utility createdResponsibilities. The databases contain full text or scanned copies of many of these documents, and descriptions of others along with information about how to get copies. Please contact the Permit Center for . Help us address our state's housing crisis by getting involved. Visit our Online Permits website or call (253) 798-4900 or (253) 798-7290. Third, if the county wants to provide an exception to the forest retention requirement for agriculture similar to the impervious surface exception we will support it. . having a limit to the amount of impervious surface allowed on the property for the purpose of limiting stormwater flows and is subject to the following restrictions. 4 Impervious Surfaces No more than 5% of the site shall consist of impervious surfaces. . TIGER 2000 roads (1 band)4. Several parking areas will receive an asphalt overlay (no removal . And Impervious Surface Limits For Your SED Review the table below which can also be found in ICC 17.05A.090 to understand how far your development needs to be . Charging for Streets Many cities in the State charge their own streets for stormwater service. By exclusion, null value areas imply vegetated or water. New roadway is assumed to be pollution-generating impervious surface. . Instead of multiplying your rate by the total acreage of your parcel, we multiply your rate by only the number of impervious acres. Small playgrounds for children are allowed, within the 15% non-vegetative impervious surface limit described below, not to exceed 5,000 square feet, and compatible with the other open space values of the property. When the required number of protected trees cannot be retained, new trees, with a 2" caliper or greater, shall be planted. elL- ~C~Of. PASSED thi s 2.-z,JL day of ~,19. Chapter 15.52SURFACE WATER MANAGEMENT. because this project will comply with the 2009 King County Surface . the City of North Bend that creates between 2,000 and 5,000 sf of new impervious surface, replaced impervious surface, or new plus replaced impervious surface, OR 7,000 square feet . the 2009 King County Surface Water Design Manual (KCSWDM). Existing impervious surfaces to remain within the project limits include the existing seminary building . Impervious surfaces have for many years been recognized as an indicator of the intensity of the urban . Floodplain Encroachment. Program 10') WHEEL STRIP DRIVEWAY DESIGN REQUIREMENTS for the typical 10-foot driveway width: The two pavement strips must be no more than 2.5-feet wide. MRLC 1992 classification (1 band)3. 1 (1) Purpose. The maximum allowed density is 26 units per acre. clearing limits/minimize clearing . Washington City Limits data (1 band)6 . Identified by King County Assessor tax parcel number 192405 -9180 SEPA Compliance: The proposal is categorically exempt from SEPA pursuant to WAC 197-11- 800(6)(e ). 15.52.040 Work contracted out. Check the King County Parcel Viewer. In the Pacific Northwest, for instance, the maximum allowable impervious surface area ranges from around 15 to 35 percent of the total parcel (depending on how the city or county has zoned the property). Degradation thresholds, stormwater detection and the limits of mitigation. For Impervious Surfaces Distribution for Eastern King County. The Office of the City Clerk keeps the records of the City Council and makes them available to the public. review, per the King County Surface Water Design Manual (KCSWDM) any impervious surface that has been added since January 8, 2001, without an approved permit, will need to be included as a target surface for flow control mitigation. 98195-2700; Senior Hydrologist, King County Water and Land Resources Divi-sion, 201 South Jackson Street, Suite 600, Seattle, Washington 98104-3855; and Associate Professor, Daniel B. Warnell School of Forest District and is subject to impervious surface limitations. Both King County and the City of Bellevue utilize forms of the density of development approach. . FOR IMPERVIOUS SURFACE LIMIT Grantor(s): . King County, Washington 4-17 May 2014 4.1.4.1. . King County Surface Water Management . In 2016, the City of Kirkland adopted the 2016 King County Surface Water Design Manual (KCSWDM). Step 4: . creates between 2,000 - 5,000 square feet of new impervious surface area is required to undergo Small Project Drainage Review. agricultural projectthat results in 2,000 square feet or more of new impervious surface,replaced impervious surface, ornew plusreplaced impervious surface, or 7,000 square feet or more ofland disturbing activity,and meets one of the following criteria: the project will result in no more than 10,000 square feet of total impervious surfaceadded There is no limit on the number of accessory structures, except that the site requirements, such as setbacks, structure coverage, and impervious surface allowances, will limit the number of structures that can be located on the site. 13. DESIGN MANUAL . Minimum 15,000 SF lots. Pollutants such as oil and other chemicals runoff from impervious areas directly into our creeks, streams, and lakes which negatively impacts water quality. The total new impervious surface within the project limits is less than 50% of the existing impervious surface. impervious surface limit. PEAK is proposed to comprise a 45,000 square . Questions about the NLCD mapping zone 01 can be directed to the NLCD 2001 land cover mapping team at the National Center, EROS, Sioux Falls, SD (605) 594-6151 or mrlc@usgs.gov. impervious-surface limits, forest-retention policies, stormwater detention, riparian-buffer maintenance, and protection of wetlands . 5. The total percentage of the Property that can be covered by impervious surfaces (including buildings) . . If you are unaware of who your development engineer is, contact Mitch Brells, Development Engineering Area Supervisor, at (253) 798-3755. Kitsap County 2016 Comprehensive Plan Update Appendix F 7 November 2015 Basin No Action Zoning 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 Evans Creek Basins as part of the King County Surface Water Management Program. The program funds construction and maintenance of drainage and flood-control systems designed to limit the flooding and erosion caused by increasing development in the county's unincorporated areas. King, Pierce, Clark, and Snohomish Counties, as well as the Cities of Tacoma . Otherwise, public agency or utility office is a conditional use. On April 28, 1986, the King County Council approves an $8.4-million-per-year Surface Water Management program. 6 . impervious surface definition in the 2016 KCSWDM, if the pipe is used as an underdrain, . This category will define areas with generally high-runoff values, high-erosion potential, and little or no opportunity to support substantial vegetation, either due to poor soil conditions . . This step also allows a limited level of panel edge smoothing. ), patios, pool decking, etc. In Effort to Preserve Land, King County, Wash., Limits Uses of Rural Property, SEATTLE TIMES, Oct. 26, 2004, at B1, available at 2004 WLNR 14643898. . At least 4 feet of the 10-foot driveway width must be amended soil planted with grass The to review the history of surface-water management in King County as it relates to the analysis and mitigation of those consequences; and to evaluate the basis for a specific proposal, first explored almost a decade ago, to limit effective impervious . One way to limit it is to assume that the DNR's training sets are a representative sample to be . On this day personally appeared before me: , to me known to be the individual(s) described in and who executed the within and foregoing instrument and acknowledged that they signed . 4~' ATTEST: ~ w:,. If, for example, we have a 1-acre site where 75% of the building ground floor area is dedicated to multifamily uses and 25% of the building ground floor area is dedicated to commercial uses, the impervious cover limit will be calculated by multiplying 75% of the gross site area (0.75 acres) by 60% (the multifamily use impervious cover limit . Core Requirement #5 of the 2016 King County Stormwater Design Manual (KCSWDM), and Appendix D of the KCSWDM (1.2.5.2.C/D.2.3.3). The second and third-most dominant cover types are grass (21%) and shrub cover (21%) with . The request does not exceed the impervious surface limits of the overlay district, since the property receives a credit for impervious surface constructed prior to 1994 and the request is less than the 24% maximum impervious surface total allowed for the 19.110.080 Increases to single-story construction limits - City center core and frame. Impervious surfaces are considered ineffective if: 1) the runoff is fully dispersed as described in Appendix C of this manual; 2) residential roof runoff is infiltrated in One way to limit it is to assume that the DNR's training sets are a representative sample to be . The City has adopted the 2009 King County Surface Water Design Manual (KCSWDM). King County GIS Center King Street Center 201 S. Jackson St. Suite 706 Seattle, WA 98104 giscenter@kingcounty.gov + 47.59909 N - 122.33136 W + 47 35' 56.72" Information provided in this document and on the plans shall be considered a minimum. Section C.2.9 Reduced Impervious Surface CreditReduced Impervious Surface Credit C-98 . ABSTRACT: For 20 years, King County, Washington, . The City of Mercer Island has four single-family zones, three multi-family zones, four commercial or mixed-use zones, and one public zone, consisting of the following: Minimum 8,400 SF lots. Identified by King County Assessor tax parcel number 810610 -0090 SEPA Determination: The proposal is categorically exempt from SEPA pursuant to WAC 197-11 - Limits/Minimize Clearing . Washington Populated Places (1 band)5. Impervious surface and hardscape calculations show the square footage of all impervious surfaces and/or hard surface coverage on-site in . Visit King County Parcel Viewer; . The maximum impervious surface percentage for each residential zone shown in the Site Requirements Chart (RCDG 20C.30.25-140) establishes the maximum percentage of a lot's area that may be covered with structures (including outdoor storage), paved areas, and other impervious surfaces. The Reach 2 riparian zone is dominated by impervious surfaces (31%), including roads, parking lots, and buildings. the Counci 1 An area which is low-lying and either has no surface water outlet, or has such a limited outlet that during storm events the area acts as a retention basin, with more than 5000 square feet of water surface area at overflow elevation. ERDAS Imagine Procedures Step 1: Mosaic Products from V Utilizing the feathering option for image overlap, mosaic the categorized panels into one file. Following state codes enacted in 2001, local governments can limit homeowners, especially in watershed areas, in the amount of ground that is covered by solid surfaces. King County or its municipal successors shall have a nonexclusive perpetual access . Girls Clubs of King County for various approvals and permits to allow construction of the PEAK project (hereafter "the Project"). . For Impervious Surfaces Distribution for Eastern King County. COUNTY OF KING )ss. ResearchWorks Archive. King County GIS Center King Street Center 201 S. Jackson St. Suite 706 Seattle, WA 98104 giscenter@kingcounty.gov + 47.59909 N - 122.33136 W + 47 35' 56.72" Impervious surface means a hard . limit the potential for runoff and sediment transport. . Toggle navigation. 1990. . impervious surface limit. The rule applies to all . To provide affordable housing to the citizens of Federal Way and to comply with the Growth Management Act and the county-wide planning policies for King County. Minimum 9,600 SF lots. Other: c. Will impervious surfaces cover more than 10 percent of the portion of the lot within the floodplain? Tweet. impervious surface limit. Yard Requirements Yard Dimension Front 20' or average of front yards on either side Rear 25' or 20% of lot depth (min. Floodplain regulations within the Marymoor Park area are administered by King County through King County Code 21A.24. The director shall determine the number of square feet of impervious surface in all nonsingle-family residential parcels, excluding agricultural and undeveloped parcels, and the total surface area of each parcel of real property, through the records of the King County assessor and through aerial photographic or geographic information system . This corrected for any small areas of pixels that may have been included as part of the impervious surface layer because their spectral signature was not covered in the Cubist modeling process. Pitched roofs may exceed maximum height limit by 5' with a minimum 4:12 slope. . National Land Cover Database Zone 01 Imperviousness Layer Metadata also available as Frequently-anticipated questions: What does this data set describe? Some accessory structures do not require a Building permit depending on The dotted lines on the map to the right indicate the city limits. Provide a project-wide (King County and southwest Snohomish county) generalized interpretation of impervious and impacted surface current to 2007 for those areas completed. Tukwila city limits and protects significant regional and local economic assets . Impervious surfaces such as roofs, roads, . Can to be used, within limitations of accuracy, to determine the distribution of these types of surfaces across the . We also receive and maintain many different types of documents that must, by law or as a result of legislation, be filed with us. . According to Sam Pace, Housing Specialist with Seattle King County REALTORS, Renton's PRADU program "should serve as a model for cities throughout the Central Puget's Sound Region.". Storm Drainage Policy D-12 of the COK Pre-Approved Plans. feet of impervious surface coverage are allowed on the PROPERTY. Preservation of aquatic resources in developing areas will require integrated mitigation, which must including impervious-surface limits, forest-retention policies, stormwater detention, riparian-buffer maintenance, and protection of wetlands and unstable slopes. KING COUNTY, WASHINGTON. As we have seen, excessive clearing and impervious surfaces create serious public harm and the Court of Appeals in the Sims 5,000 square feet of new and replaced impervious surfaces, or proposes more than 7,000 square feet of land disturbing activity, and meets one of the following criteria: Less than 3/4 of an acre (32,670 square feet) of new pervious surface AND Meets one of Threshold Criteria #1 through #6 listed within Section 1.1.2.1 of the SWDM Share. Pathways and surfaces under canopy of trees are excepted. Must be plotted to scale, with all significant dimensions given. Article I. Appendix C of the KCSWDM explains the submittal requirements for Small Project Drainage KING COUNTY COUNCIL KING COUNTY, WASHINGTON . STORMWATER TECHNICAL GUIDE VII FEBRUARY 2015 Acronyms APN Assessor's Parcel Number BMP Best Management Practice CCRs Covenants, Conditions, and Restrictions CDP Census-Designated Place DMA Drainage Management Area (see Chapter 4) EISA Equivalent Impervious Surface Area, as defined in the PCRs HOA Home Owners Association HSG Hydrologic Soils Group (A, B, C, or D, as defined by NRCS)