NR 106.55(4)(4) Limitations for wetlands. Effluent temperature limitations shall be established for wetlands on a case-by-case basis to meet the water quality standards provided in ch. NR 103, but in no case shall the effluent temperature limitation be greater than 120°F. NR 106.55(5)(a)(a) General. A permittee may request, at time of permit application, an effluent limitation greater than the effluent temperature limitations required under subs. (2) to (4), (6) or (7) if the discharge is to a storm sewer or other storm water conveyance channel. The permittee may request that the higher effluent limitation be greater than 120°F if the permittee is able to demonstrate to the satisfaction of the department that the heated effluent is not discharged in a manner that will cause a potential for scalding of humans. An effluent temperature limitation established under this subsection shall be determined according to the following equation: Tss = Tdir + (HLV x (L/100))
Where:
NR 106.55(5)(b)(b) Alternative heat loss value. An alternative heat loss value (HLV) may be used in the equation in par. (a). The alternative value shall be representative of seasonal influences on heat loss and be based on a comparison of effluent temperature at the location of discharge to the storm sewer or storm water conveyance channel and the point at which the storm sewer or storm water conveyance channel discharges to a surface water of the state. NR 106.55(5)(c)(c) Site-specific information. The department may use available site-specific information to determine an alternative heat loss value or other data demonstrating the amount of heat loss in a storm sewer to establish an effluent temperature limitation for discharges to a storm sewer. NR 106.55(6)(6) Limitations for receiving waters with unidirectional flow not designated as limited aquatic life. Except as provided in subs. (2) to (5), the department shall establish water quality-based effluent limitations to ensure that effluent is not discharged at elevated temperatures that may adversely affect humans or aquatic life at or near the point of discharge for discharges to surface waters with unidirectional flow. NR 106.55(6)(a)(a) Flow ratio categories. Effluent temperature limitations shall be established based upon the designated use of the water and the ratio of streamflow to effluent flow as determined in Table 1. Effluent flow shall be equal to the value specified in s. NR 106.53 (2) (a). Table 1 — Flow Ratio Categories
NR 106.55(6)(b)(b) Calculation of limitations. The methods described in this paragraph apply to the determination of both acute and sub-lethal effluent temperature limitations. Water quality-based effluent temperature limitations to meet the requirements of this subsection shall be determined using the following procedures: WQBEL = [((WQC - Ta)(Qs + (1 - f)Qe)) / Qe] + Ta
Where:
NR 106.55(6)(c)(c) Limitations for mussel control. Short-term excursions from the effluent temperature limitation determined in this subsection may occur for the purposes of zebra or other mussel control if approved by the department and authorized in a permit on a case-by-case basis. NR 106.55(6)(d)(d) More stringent limitations. The department shall establish more stringent effluent temperature limitations than those determined under the provisions of this subsection whenever it is demonstrated that the temperature of the discharge may cause or contribute to nonattainment of aquatic life uses and that more stringent limitations are necessary to assure the protection and propagation of a balanced indigenous population of shellfish, fish and wildlife in or on the body of water into which the discharge is made. Effluent temperature limitations under this paragraph shall be established whenever one or more of the mixing zone requirements in s. NR 102.05 (3), as they apply to temperature, are not maintained. NR 106.55(7)(7) Limitations for inland lakes, impoundments and great lakes waters. The department shall establish water quality-based effluent limitations to ensure that the effluent is not discharged at elevated temperatures that may adversely affect humans or aquatic life at or near the point of discharge for discharges to surface waters that are inland lakes, impoundments, or Great Lakes waters that do not exhibit unidirectional flow. NR 106.55(7)(a)(a) Limitations for mussel control. Short-term excursions from the effluent temperature limitation determined in this subsection may occur for the purposes of zebra or other mussel control if approved by the department and authorized in a permit on a case-by-case basis. NR 106.55(7)(b)(b) Calculation of limitations. The methods described in this paragraph apply to the determination of both acute and sub-lethal effluent temperature limitations. Water quality-based effluent temperature limitations to meet the requirements of this subsection shall be determined using the following procedures: WQBEL = [(WQC- Ta)/(e-a)] + Ta
Where:
a = [(A)(54.7 + B(150))] / [(8,345,000)(Qe)]
Where:
A = Area of mixing zone in square feet, as follows:
B = A coefficient which is a function of Ta as follows:
