CITY OF BROOKFIELD STORMWATER MANAGEMENT PLAN APPLICATION PACKAGE STANDARD FORM

Transcription

1 CITY OF BROOKFIELD STORMWATER MANAGEMENT PLAN APPLICATION PACKAGE STANDARD FORM Contents: Storm Water Management Plan Application Dry Weather Storm Sewer Visual Inspection Form Rainfall Depths for Design Storms Subwatershed Map Storm Water Management Plan Review Flowchart MMSD Storm Water Management Plan Checklist 4/13/2016 S:\Development Standards\Stormwater\SWMP Application Standard Form (Rev )\Coversheet swmp.docx

2 CITY OF BROOKFIELD STORM WATER MANAGEMENT PLAN APPLICATION Item 1 Project Name Project Location Project Address Total Site Acreage Impervious surface area (s.f.) Greenspace surface area (s.f.) Total Proposed Area of Disturbance (s.f.) Existing Proposed Item 2 Owner Engineer Developer Preparer Name Address Phone/Fax Numbers / / / / Item 3 Description of Development/Redevelopment (w/ impervious area (SF) increase/decrease): Item 4 Illegal Connection (Not applicable to new development on vacant sites) Verification by a licensed plumber that no illegal connections exist between storm and sanitary sewers. Determination is dependent upon review of existing plumbing plans. A visual inspection of the storm sewer must be conducted during dry weather, and of the sanitary sewer during wet weather. Complete attached form. Completed review of plumbing plan? yes no Visual inspection of storm sewer? yes no Visual inspection of sanitary sewer? yes no Do illegal connections exist? yes no If yes, what is the plan of correction? Revised 5/10/2004, Updated 04/13/2016 Page 1 of 3

3 Item 5 Illicit Discharges (Not applicable to new development on vacant sites.) Any discharge from the site which is not comprised entirely of stormwater, unless permitted by the State of Wisconsin, is an illicit discharge. This could include, but is not limited to: spills, dumping and disposal of any substance, storm water runoff from outdoor storage of materials. Based on a site visit, the preparer of this document must certify: Do illicit discharges exist on site? yes no If yes, what is the plan of correction? Item 6 What watershed is this site tributary to? (see attached map): Butler Ditch Deer Creek Dousman Ditch Lower Menomonee River Poplar Creek South Branch of Underwood Creek Underwood Creek Upper Fox River Item 7 Stormwater Discharge Rates: Peak flow rates must be calculated for the 2, 10 and 100 year design storms for the existing and proposed conditions for the entire site of ownership. Calculations must be provided and a summary given below. Note that watersheds within the MMSD service area follow MMSD Chapter 13 Surface Water and Storm Water rules. Conditions 2 year design storm 10 year design storm 100 year design storm Existing Proposed Proposed After Controls Item 8 Stormwater Quality Calculations: Per Section of the Municipal Code, the preparer certifies by checking below, that SLAMM (Source Loading and Management Model) or other approved calculations have been prepared for this site and the proposed Best Management Practices have been designed to meet the requirements, specifically to remove, on an average annual basis, a goal of 80% of the total suspended solids load based on no controls (for the proposed area of development). Water Quality Calculations have been prepared and the proposed site meets Section Yes No If yes, attach a copy of the calculations with the application. Item 9 Soil Types: Provide a description of soil types according to soil borings. Also indicate depth of groundwater if encountered during soil boring (groundwater level will be required if a detention pond is proposed). Revised 5/10/2004, Updated 04/13/2016 Page 2 of 3

4 Item 10 Stormwater Best Management Practices (post construction) Proposed Structural Practices Proposed Non-Structural Practices (include maintenance of structural practices) Item 11 Stormwater Management Maintenance Agreement The maintenance or non-structural best management as proposed above are to be conducted by the owner or owner's representative. These items are to be included in the owner's annual maintenance budget and will be carried through as proposed in item 10. Name of Owner or Representative Responsible for Maintenance: Owner's Signature and Date: Phone number of Person Responsible for Maintenance: Item 12 Stamp, Date and Signature of Preparer City of Brookfield State of Wisconsin Licensed Professional Engineer Recommended Approval Project Engineer Date City of Brookfield Approval City Engineer Date Revised 5/10/2004, Updated 04/13/2016 Page 3 of 3

5 Address/Location of test: CITY OF BROOKFIELD STORM WATER SYSTEM DRY WEATHER VISUAL INSPECTION FORM Name of technician/tester: Test Date: Date of Last Rainfall: Amount of Last Rainfall: in. Is pipe/outfall active? Yes No If Yes, complete section below: Water depth in pipe: ft. Flow Velocity: ft./sec. Ambient Temperature: F Water Temperature: F ph: Color: Clear, Yellow, Grey, Brown, Green, Other Turbidity: Clear, Slightly Cloudy, Cloudy, Opaque Surface Sheen: None, Oil, Gasoline, Scum, Unknown Odor: None, Oil, Paint, Sulfur Dioxide, Fuel, Sewage, Decaying Vegetation, Unknown Additional Comments/Observations: Signature of Technician/Tester: 8/10/99 cbg

6 City of Brookfield Stormwater Management Plan Application Rainfall Depths Design Rainfall Depths for the Southeastern Wisconsin Region (AA ATLAS 14) Rainfall Depths for 24-Hour Storm Duration 2 year 10 year 100 year Effective 3/1/2016

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8 Applicability Flow Chart for Stormwater Management Note the following stormwater management ordinance rules apply to: -All properties with land use development, redevelopment, and land division activities -All properties with land division occuring after May 2000, must consider the gross aggregate area of the original parcel -All contiguous properties with same ownership, must consider the gross aggregate area of all contiguous properties owned Revised: April 2016 City of Brookfield Stormwater Management/MMSD Ch. 13 Rules WDNR NR 151 Construction and Post Construction Rules Is the site located east of the subcontinental divide or tributary to MMSD sanitary sewer? Does the Development propose an addition of 0.5 acres or more of impervious surface, porous pavement or vegetated roof; or demolition or construction during redevelopment will disturb an area larger than 2 acres? Is the site located in the Lower Menomonee River stormwater basins? Is your project located in the Underwood Creek/Dousman Ditch watershed? Is your site non-residential or residential? Residential Non-Residential All sites must submit a Stormwater Management Application regardless of parcel size. Stormwater Management will be decided on a case by case basis. * The City of Brookfield reserves the right under Ch D of the municipal code of ordinances, to require a Stormwater Management Plan of any new development, redevelopment or land division if, in the opinion of the City, the development is likely to cause water quality or quantity concerns. Are there plans for rezoning within this development? Is your site 5 acres or more? A Stormwater Management Plan and Application under MMSD Chapter 13 applies ** Are you proposing an increase of 0.5 acres or more of impervious surface, Is your site 3 acres or more? A Stormwater Management Application is A Stormwater Management Short Form Application is * A Stormwater Management Plan and Application under MMSD Chapter 13 may apply if proposed development does not meet the Underwood Creek/Dousman Ditch proposed development map. Stormwater Management Plan and Application is Stormwater Management Short Form Application is * Are you proposing an increase of 1.5 acres or more of impervious areas? Stormwater Management Plan and Application is Stormwater Management Plan and Application per the City's ordinance is Stormwater Management Plan is ** Stormwater Management Short Form Application is * Are you proposing 1 acre or more of disturbed area? (NR (2)(b)) NR 151 Construction standards Is the construction site a redevelopment site? Site exempt from NR 151 standards Is there an increase in exposed parking lots or roadways? Is there less than 10% connected imperviousness area (Cumulative imperviousness area less than 1 acre)? NR 151 Post Construction standards Site exempt from NR 151 post construction standards Site exempt from NR 151 post construction standards NR 151 Post Construction standards ** Exempt if: 1) Residential infill development of 5 acres or less with a proportion of impervious surface less than 20% of the total site, provided that each boundary of the site is contiguous to earlier development served by sewers, streets, or public water, or contiguous to parkland, public lands, a utility right-of-way, or a watercourse. 2) Recreational trails that are 10 feet or less in width, if they have a pervious buffer of at least five feet on each side. Parking Lots within MMSD: Runoff management is required for the reconstruction of parking lots when the parking lot will be reconfigured or re-contoured. REFERENCES -Stormwater Management Ordinance No Chapter 14 - City of Brookfield Municipal Code -Chapter NR 151 Dept. of Natural Resources Runoff Management -MMSD's Chapter 13 Surface Water and Stormwater Regulations

9 Chapter 13 Surface Water and Storm Water Reviews Storm Water Management Plan Submittal Checklist Municipality: Name of contact person: Project name: New submittal Resubmittal #: Date submitted: Telephone number: The following items must be provided in a Storm Water Management Plan (SMP) to be considered a complete submittal and initiate the District s Chapter 13 review process: Transmittal Letter. Letter must state community has reviewed and approved the SMP per the Chapter 13 requirements. Narrative Description. Narrative should describe the site and summarize the analysis performed. It should include: Site location (include watershed and subwatershed) Description of existing and proposed conditions Methods used for analysis Discussion of the critical duration analysis performed if using the SEWRPC 90 th distribution Summary of calculations and results Site Plan. Plan should be clearly labeled, drawn at a reasonable scale and contain: Owner s property line District and municipal easements Public streets State plane coordinate reference Watercourses, drainage ways and overflow paths Storm sewers Offsite drainage entry point Offsite drainage watershed delineation Existing detention facilities including those of adjacent properties if affected by drainage from the site Existing natural storage areas Existing buildings and structures Existing contours at a minimum of 2-foot intervals Proposed low impact development (LID) features (if applicable) Proposed contours at a minimum of 2-foot intervals Proposed impervious areas Drainage Basin Delineation. Onsite and offsite areas tributary to the detention basin(s) must be delineated. Flow paths should be clearly marked. Revised: November 2010

10 Drainage Basin Data. Basin areas Impervious areas Soil types (source reference) Curve number calculations Time of concentration calculations Proposed Conditions Hydrograph. Proposed Conditions with Detention Hydrograph. Critical Duration Analysis (if applicable). Detention Basin Design. Elevation versus storage relation for each detention basin Computer model analysis of hydrograph routing through the pond for the 2- and 100-year event or calculations Peak outflow versus required unit release rate or presentation of runoff volume during critical time period shown in table or hydrograph plot Outlet Design. Drawing or sketch Rating curve Calculations Computer Model Input and Output or Hydrograph and Routing Calculations. LID Quicksheet pages as appropriate to document use of Low Impact Development onsite. Maintenance Plan and Responsible Party Designation. Maintenance plan Identification of responsible party Funding source Signed letter Additional Items Required when the Volumetric Design Procedure is Used: Existing Conditions Hydrograph. Flood Volume Calculations. Critical time period used Computation of existing and proposed flood volume Revised: November 2010

11 Additional Items Required when a Multi-site Analysis is Performed: Use of the Volumetric Design Procedure for Storage Facilities. Analysis of Ultimate Development in Tributary Watershed. Construction Sequence and Schedule. Plan must show adequate storm water management will be provided throughout the multiple phases of construction. Identification of All Responsible Parties. Analysis of Required Funding. Financial and Legal Documentation. Identification of Required Drainage/Conveyance Improvements Between the Developments of the Multi-site Facility. Determine Effective Conveyance to Multiple Storage Facilities. Multi-jurisdictional Coordination Plan and Necessary Agreements. Items Required for Land Disturbances Greater than 2 Acres and Less than 0.5 Acres of New Impervious Surface: Transmittal Letter. Letter must state community has reviewed and approved the SMP per the Chapter 13 requirements. Narrative Description. Narrative should describe the site and summarize the analysis performed. It should include: Site location (include watershed and subwatershed) Description of existing and proposed conditions Methods used for analysis Discussion of the critical duration analysis performed if using the SEWRPC 90 th distribution Summary of calculations and results Site Plan. Plan should be clearly labeled, drawn at a reasonable scale and contain: Owner s property line District and municipal easements Public streets State plane coordinate reference Watercourses, drainage ways and overflow paths Storm sewers Offsite drainage entry point Revised: November 2010

12 Offsite drainage watershed delineation Existing detention facilities including those of adjacent properties if affected by drainage from the site Existing natural storage areas Existing buildings and structures Existing contours at a minimum of 2-foot intervals Proposed low impact development (LID) features (if applicable) Proposed contours at a minimum of 2-foot intervals Proposed impervious areas Proposed areas of land disturbing activity, which includes demolition and construction Drainage Basin Delineation. Onsite and offsite areas tributary to the detention basin(s) must be delineated. Flow paths should be clearly marked. Drainage Basin Data. Basin areas Impervious areas Soil types (source reference) Curve number calculations Time of concentration calculations Proposed Conditions Hydrograph. Proposed Conditions with Detention Hydrograph. Detention Basin Design (if applicable). Elevation versus storage relation for each detention basin Computer model analysis of hydrograph routing through the pond for the 2- and 100-year event or calculations Peak outflow versus required unit release rate or presentation of runoff volume during critical time period shown in table or hydrograph plot Outlet Design (if applicable). Drawing or sketch Rating curve Calculations Computer Model Input and Output or Hydrograph and Routing Calculations. LID Quicksheet pages as appropriate to document use of Low Impact Development onsite. Revised: November 2010

13 Maintenance Plan and Responsible Party Designation. Maintenance plan Identification of responsible party Funding source Signed letter Submit completed submittal packages to: Debra Jensen, Planning Services Supervisor Milwaukee Metropolitan Sewerage District 260 West Seeboth Street Milwaukee, WI Revised: November 2010