Wis. Admin. Code Department of Natural Resources NR 333.07 - Hydraulic design and safety requirements

(1) MINIMUM HYDRAULIC CAPACITY. Except as provided in sub. (2), all proposed and existing dams shall have the minimum hydraulic capacity shown in Table I:

Table I

Required Spillway Design Capacities

Dam Hazard Rating	Minimum Principal Spillway Capacity	Minimum Total Spillway Capacity
Low (L)	Q10	Q100
Significant (S)	Q50	Q500
High (H)	Q100	Q1000

(2) REDUCED REQUIREMENTS.

(a) Unless the department determines that public safety requires full compliance with the substantive requirements of this rule, all dams which will be submerged by flows less than the minimum hydraulic capacity specified in Table I shall be designed to pass the flow of the river at submergence.

(b) Any owner may provide documentation to justify a different spillway capacity from that specified in Table I. The department shall review such documentation and may approve the spillway capacity proposed by the owner if it determines that such capacity will not result in an additional hazard to life, health or property when compared to the capacity specified in Table I.

(3) SAFETY MEASURES. The owners of all new and existing dams shall comply with the following safety measures:

(a) The owner shall have an adequate operation, inspection and maintenance plan for the dam.

(b) The dam shall be structurally stable for any flow condition up to and including the design flood flow.

(c) An adequate emergency action plan shall be prepared for the area downstream from the dam in consultation with the local unit of government and concurred in by the division of emergency government. An adequate emergency action plan shall include, but is not limited to, the following information:

1. A notification flow chart identifying involved agencies, other dam owners both upstream and downstream and their phone numbers.

2. Emergency operation procedures.

3. An inundation map of the hydraulic shadow on a scale of l" = 2000' or less that extends downstream to an elevation within one foot of the dam nonexistent profile.

4. Procedures for notification of all property owners affected by a dam failure and a list of their names, addresses and phone numbers.

Note: For additional information on emergency action plans refer to Chapter 6 of the Federal Energy Regulatory Commission's "Engineering Guidelines for the Evaluation of Hydropower Projects".

(d) Documentation showing that the requirements of pars. (a) to (c) have been met shall be submitted to the department for approval. The department shall review and approve or disapprove of the documented safety measures in writing within 90 business days after the department receives the documentation.

Notes

Wis. Admin. Code Department of Natural Resources NR 333.07

Cr. Register, May, 1985, No. 353, eff. 6-1-85; CR 00-136: r. (1), renum. (2) to (4) to be (1) to (3) and am. (1), (2), (3) (c) and (d) and Table I, Register July 2001, No. 547 eff. 8-1-01.