Policy Statement
All properties within the City of Glenwood shall contribute to the storm water utility in an amount proportional to the runoff generated by each land use type.
Credits
Storm water utility fees may be adjusted under the conditions stated below. It shall be the responsibility of the property owner to provide justification for the fee adjustment (credit).
City staff or the city engineer must approve all credit applications. Credits may be applied for year round.
Parcels subject to the standardized charges and/or are limited by a minimum or maximum fee are not be eligible for credits.
Parcel fees that would be limited by the set maximum fee can choose to keep the maximum fee or be eligible for credits or adjustments to area as set forth elsewhere herein, but not both.
Note that maximum credits are cumulative and cannot exceed 75 percent.
Wetland areas shall be excluded from the total parcel area when calculating the utility fee.
Storm Water Quantity Reduction and Quality Improvement Credits
1) Detention - If it can be demonstrated that an individual parcel detains storm water runoff such that the peak runoff rate is equal to or less than the predevelopment peak rate (prior to urbanization) for the 2-, 10- and 100-year 24-hour rainfall events, that parcel shall be eligible for up to a 50% credit.
2) Retention - If it can be demonstrated that an individual parcel meets all of the following criteria, that parcel shall be eligible for up to a 75% credit:
• Runoff volume is retained or infiltrated equal to at least 1.1 inches calculated over the parcels impervious surface.
• Retention or infiltration occurs on-site, in a constructed stormwater management facility.
• The facility is properly maintained by the property owner.
3) Water Quality - If it can be demonstrated that an individual parcel has: Best Management Practices (BMPs) constructed specifically for the purpose of storm water enhancement, and meets all of the following criteria, that parcel may be eligible for up to a 50% credit.
• Documentation must be provided to the City for evaluation of the BMP demonstrating the water quality improvement. It is required that the documentation be prepared by a licensed professional engineer of the State of Minnesota and provide the necessary drawings and calculations to support the storm water benefit. It is the applicant's responsibility to prove the benefit.
• The storm water utility fee shall be reduced by a percentage based on the treatment capacity, average annual load reduction, of the BMP(s). A cumulative maximum credit of 50% may be obtained.
• The following is a non-exhaustive list of example Best Management Practices:
Storm water retention and detention ponds
Wet or dry swales Filter Strips
Infiltration trenches or ponds
Underground Storage or Filters
Sand Filters
Soak Away Pits
Green Roof
Pervious Pavers
Dry Wells
Land Use Credits
1) Parcels with green space meeting all of the below criteria may be eligible for up to a 75% credit. The credit shall be calculated based on the percentage of the total parcel eligible.
Criteria:
a. Green/vacant space shall be pervious, continuously vegetated areas incorporated into the developed parcel.
b. The property must comply with other City of Glenwood ordinances such as mowing and nuisance or noxious weed ordinances.
c. The space shall not have more than 25% impacted, compacted soils. Examples of impacted spaces are trails and compacted gravel areas.
d. The green/vacant space must be a continuous vegetated area and be equal in size to at least 10% of the total parcel.
e. The eligible green/vacant space must have a separation of at least 10 feet from any impervious surface.