When calculating limitations for discharges to inland lakes, impoundments, or Great Lakes waters in s. NR 106.55(7)(b), what is considered to be an “off-shore” discharge?
The maximum surface areas allowed for on-shore and off-shore discharges are different in the rule. For discharges to inland lakes or impoundments, on-shore discharges allow a maximum mixing zone area of 15,708 square feet, while off-shore discharges allow a maximum mixing zone area of 31,416 square feet, or twice the shoreline area. Please note this does NOT mean the limits differ by a factor of 2, as the surface area is only one factor or element in the calculation. These areas are based on the assumption of a full or half-circle with a radius of 100 feet. If the discharge is 100 or more feet off-shore, the maximum mixing zone is based on a full circle with a 100-foot radius or 200-foot diameter, while a semi-circle of the same radius is assumed for a discharge along the shore. Theoretically, if a discharge outfall is less than 100 feet off shore, the dimensions of the maximum mixing zone should be calculated based on the area of a figure extending from the shoreline too 100 feet away
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