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City of Decatur
December 2007 Storm Water runoff ` What is a watershed? A watershed is all the land area that drains to a given body of water. Every stream, river and lake has a watershed. Bisected by the sub-continental drainage divide, the north drains to the Gulf of Mexico and the south drains to the Atlantic Ocean Watersheds and Streams in Decatur ` Required by Law Before 1977 necessary to qualify for the Flood insurance program Currently required by the EPD ` Water Quality Two 303(d) listed streams Protecting all of our natural water bodies ‣ Development Increased rates of runoff that need to be controlled ` Flooding Major areas of concern such as those in the Peavine Basin Localized areas of concern National Pollution Discharge and Elimination System (NPDES) Storm Water Regulations `Issued a Phase I Municipal Separate Storm Sewer System (MS4) Permit since June 1994 Requires a Storm Water Management Plan to reduce the level of pollutants in the City’s storm sewers City of Decatur is a Co-applicant to DeKalb County, An Intergovernmental Agreement (IGA) Metropolitan North Georgia Water Planning District (MNGWPD) Conservation Subdivision/Open Space Development Post-Development Storm Water Management for New Development and Redevelopment Illicit Discharge and Illegal Connection Floodplain Management Stream Buffer Protection Litter Control ` Chapter 90 Article VI Sections 500-505 Provides conservation for subdivisions in residential areas Minimum open space must be at least 40% of the gross tract area At least 75% of the open space must be in a contiguous tract Waddell Park ` ` ` Chapter 42 Article V Sections 111-121 Controls and minimizes increases in storm water runoff, soil erosion and sedimentation, stream channel erosion, and nonpoint source pollution Exemption: Individual single family developments that do not increase the unmitigated storm water discharge by more than 0.50 cfs for the 10-year storm event that are not part of a common or joint development ` Requirements for Site Development Review Storm Water Management Plan to show in detail how post-development runoff will be controlled Hydrology Study Water Quality calculations, if applicable Erosion and Sedimentation Control Plan Operations and Maintenance Plan for all storm water management facilities Storm Water Management Inspection and Maintenance Agreement Ongoing City inspections ` ` Chapter 42 Article IV Sections 151-160 Any direct or indirect non-stormwater discharge to the local sewer system Common Sources Car washing, Yard Waste, Animal Waste ` ` ` ` Dry weather screenings of outfalls annually by DeKalb County Must immediately notify EPD of spills or illegal dumping City conducts annual commercial/industrial business inspections City provides storm drain stenciling, promotes picking up after our pets ` ` ` ` ` Chapter 42 Article IX Sections 251-260 Updated in January 2007 Currently undergoing floodplain mapping revisions with FEMA Prohibits any new construction in the floodplain Permits are necessary for all land disturbing activity within the floodplain Variances granted through Zoning Board of Appeals ` ` ` Chapter 42 Article XI Sections 400-412 25 foot for State + 50 foot for City = 75 foot buffer Benefits of Buffers: Removes pollutants Reduces erosion and sedimentation Protection and stabilization of stream banks Maintains base flow Riparian wildlife habitat Tree canopy for shade and habitat ‣ Chapter 82 Article III Sections 50-55 Prohibits any and all littering Litter = any organic or inorganic waste material ‣ Penalties: A fine of not less than $200 and not more than $1200 Violator must reimburse the City for the reasonable cost of removing the litter Pick up litter for a distance not to exceed one mile ` ` ` Inspections Commercial Businesses – 131 Businesses, 9 City sites Structural and Source Control Measures • Detention Ponds – public and private 270 per year • Catch Basins – 500 per year • Inlets – 500-600 per year • Manholes – 50-100 per year • Flumes/Ditches – 10 per year • Headwalls – 20 per year • Storm Drain Lines – 200 per year Street Maintenance 56 miles of roads with approximately 735 miles swept per year Litter Control 30 tons of litter was removed last reporting period ` Monitoring DeKalb County, per our Intergovernmental Agreement, IGA, handles all our monitoring • Storm water sampling in streams • Water Quality trend monitoring in streams • Fecal Coliform monitoring for our 303(d) listed streams • Dry weather illicit discharge Screenings ` Illicit Discharge and Detection and Elimination Outfall Screenings - Dry weather illicit discharge screenings at random outfalls (4 per 5,000 people – 16 outfalls each year in Decatur) • 99 outfalls mapped • If flow is found in dry weather, investigative measures are taken to identify the source and eliminate it ` Fecal Coliform Sampling EPD 303(d) listed streams for fecal coliform • Shoal Creek – headwaters to the South River • Peavine Creek – 3 miles in DeKalb County Long-term goal is to reduce the pollutant loadings in the streams • Encourage picking up after our pets • “Drains to Stream” decals • Enforce Water quality runoff requirements on developments ` Construction Site Management Site Plan Reviews • Minor Developments – Single family developments where the runoff is not ≥ 0.50 cfs for the 10-year storm event – NO Detention Required x Submit a survey based site plan and include: x Current conditions x Proposed work x Current zoning setbacks x Lot coverage calculations (<40%) x Stream bank buffer, if applicable x Flood plain limits and elevation, if applicable ` Construction Site Management Site Plan Reviews – All Other Developments • Storm water detention with hydrology study • Operation and Maintenance Plan for all storm water management facilities (inlets, detention, catch basins) onsite • Water Quality for sites with ≥ 5,000 ft2 of impervious area or ≥ 10,000 ft2 of disturbed area • Erosion and Sedimentation Plan – Must be approved by Georgia Soil and Water Conservation Commission if the site is ≥ 1.0 acre for a single family development or ≥ 5,000 ft2 of for all other developments • Must comply with EPD’s General Permit for Construction Activities for Sites ≥ 1.0 ac ` Goal to control erosion and sedimentation at construction sites – 3 types GAR100001 – Stand alone projects GAR100002 – Infrastructure projects (Linear) GAR100003 – Common Developments ` ` ` ` ` Construction activities ≥ 1.0 acre NOI filed 14 days prior to start of construction Inspections – Once every 7 days and/or after every 0.5 inches of rain Sampling – At every outfall and/or upstream and downstream in a near by receiving water body NOT filed at final stabilization ` Educational Activities Decatur 101 – Storm Water issues presented during 2 sessions of the program Floodplain management information on the City’s website Clean Water Act decals on inlets Investigate all citizen complaints Distribute literature such as “Put the Brakes on Water Pollution” and “ Menu for a Cleaner and Healthier Environment” from the Clean Water Campaign ` ` Remodeling efforts completed in September 2007 Improvements Needed: West Trinity Place to Decatur Police Station Decatur Police Department parking area to Electric Ave Electric Avenue to Commerce Drive Commerce Drive to North McDonough Street North McDonough Street, along Maple Street, to Church Street Church Street to East Trinity Place East Trinity Place to East Howard Avenue to Hillyer Place Starts at Commerce Drive and Pate Street, crosses several private properties, and daylights next to the rear of the Postal Service Property 234 West Davis at Kings Highway Glenlake Park Master Plan Project Stream Bank Restoration and Water Quality •Bioretention Areas •Stream bank Restoration •Demonstration Day •Educational Brochures North Parkwood Drive and Westchester Drive ` Tree Ordinance Promotes tree conservation Promotes an increase in tree canopy Protects existing trees ` Zoning Ordinance Limits the amount of impervious service on residential lots - Maximum lot coverage is 40%
