Mompano Dam Rehabilitation Project

The Mompano Dam Rehabilitation project integrates several techniques to achieve various watershed management objectives. These included dam safety, mitigation of increased runoff produced by development, and the maintenance of Beaver Lake as an important aesthetic and habitat resource. Innovative spillway geometry improved detention capacity while increasing conveyance for major storm events. The solution utilizes a new trapezoidal spillway while maintaining the existing spillway and fish ladder. The new spillway reduces discharge during small storm events due to its narrower opening. This improves downstream channel stability and improves aquatic habitat. The existing spillway becomes an overflow adding conveyance during the largest events (including the probable maximum flood or PMF). Maintaining the existing fish ladder allowed rapid project acceptance from regulatory agencies.