Submittal Requirements

Submittal Requirements

Rule 4 – Stormwater Exhibits and Information

No permit application is needed, but CRWD approval is required. The following exhibits and information must be submitted electronically to:  james@mowerdistrict.org

Rule 5 – Drainage Exhibits and Information

The following exhibits and information must accompany the permit application. PDFs can be sent electronically to:   james@mowerdistrict.org

• For "Ditch Maintenance" in excess of 250 linear feet requires:
  • A documentation of original constructed ditch depth, grade, and side slopes.
  • An "as-built" survey including ditch cross section descriptions on each segment of the ditch along with elevations of bridge or culvert flowlines.
• For "Culvert Maintenance", if replacing same material, size, grade, and depth.
  • A documentation of original culvert material, size, depth, and grade.
  • All vertical datum must be based on a sea level standard
  • An "as-built" survey of construction
• For "Ditch Improvement" or "Culvert Improvement"
  • Documentation proving there are not negative downstream impacts from the
    District's hydrologic and hydraulic model or demonstrated by a professional
    engineer registered in the State of Minnesota.
  • An "as-built" certificate of survey including centerline elevations and ditch cross section descriptions every 500 feet.

• For a "New Ditch" or "New Culvert" o Vicinity map.
  • A site map where drainage facilities are labeled in addition to outlet location elevations, slope and typical cross-section.
  • Topographic map showing existing and proposed contours extending at least 100 feet offsite.
  • Identification of existing and proposed drainage features such as ditches, swales, pipes, overflows, catch basins, and water quality ponds.
  • Copies of plans and specifications for any drainage project o Delineation of existing and proposed subwatersheds. o Delineation of wetlands onsite and narrative stating how project will affect these
    wetlands.
  • Documentation that the drainage project complies with all federal state and
    local wetland laws.
  • Calculation of flows for existing and proposed conditions for the 2-, 10-, 100-
    year and 10-day snowmelt.
  • Demonstration from a Minnesota Professional Engineer that there is a no net
    increase in flowage capacity and stage from the existing conditions or structure.
  • Identification of erosion control BMPs to ensure a stable outlet and channel.
  • As built elevations tied to sea level datum will be required by the District after construction and will be a condition of the permit.
  • Documentation confirming that no illicit discharges are connected to or will be connected to the drainage facility.
  • Ditches require a 16.5 foot buffer be established within a year from the permit

Rule 6 – Floodplain Exhibits and Information
The following exhibits and information must accompany the permit application. PDFs can be sent electronically to:  james@mowerdistrict.org

• Site map and plans.
• Identification of normal and 100-year water levels for all existing and proposed ponds,
  wetlands, or other drainage features.
• Delineation of 100-year floodplain and floodway onsite, if present.
• Lowest floor elevations for each structure (if applicable).
• Calculations from a Professional Engineer that indicate the impacts for:
  • Floodplain storage volume
  • Peak discharge rates
  • Water levels
• If the "Impact" is in excess of 50 cubic yards of is needed applicant must
  • Demonstrate that the impacts are needed to reasonably complete the project.
  • Demonstrate that alternatives have been considered to avoid and minimize the impacts.
  • Work with CRWD staff to submit a CRWD-approved mitigation plan.
• For the Snow Management Plan the storage area is set back at least 100 feet from the
  Drainageway, Open Ditch or Public Drainage System. The plan needs to be submitted and approved by October 1st of each year.
  • Plan requirements:
    1. Vicinity map
    2. Design for BMP system for maximum pollutant removal.
    3. Installation, Implementation and Maintenance plan for site

Rule 7 – Waterbody Alterations Exhibits and Information
The following exhibits and information must accompany the permit application. One set at 11"x17"; and a copy of all submittals in electronic .pdf format.

• Vicinity map and site map and site drawing
• Written approval from the owners of property that could potentially be affected by such
  construction and shall be consistent with the District Engineer or consultant's
  recommendation.
• A map of best management practices designed to minimize the increase in suspended
  solids.
• Demonstrate that adequate measures have been taken to protect adjacent, nearby,
  upstream, and downstream properties from flooding and the necessary easements have
  been obtained.
• The maximum and average depth, and the 100 year flood and normal elevation of water
  in any detention basin, impoundment, wetland, pond, or slough affected by the
  Waterbody Project.
• Design elevation of any and all proposed dikes, dams, levees, berms, or any area filled
  higher the original ground.
• The design of dedicated emergency overflow that is designed not to allow for flows to
  washout the dikes, dam, levee, or berm to convey overflows without causing
  downstream erosion.
• Computations regarding the capacity and design of any Waterbody Project.
• Identify the location size and capacity of all outlets for water from the waterbody project and elevations of any detention basins, impoundments, ponds, slough, wetlands, or other drainage features.
• An engineered study of the potential affects where improper construction or failure could result in considerable damage (if applicable).
• As built elevations will be required by the District after construction and will be a condition of the permit.

Rule 8 – Erosion Control Exhibits and Information
The following exhibits and information must accompany the permit application. One set at 11"x17"; and a copy of all submittals in electronic .pdf format.

For sites greater than one acre

• Copy of the building permit applications including erosion and storm water runoff plans as well as a timetable for implementations
• Storm water runoff plans must include snow removal, dumping and retention methods

For sites greater than 2500 square feet and less than one acre it is required that

• Down gradient silt fence or other approved method as listed in the Minnesota Storm Water Manual
• Vehicle tracking plan
• Stockpile control
• Turf establishment
• Good housekeeping

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