Engineered Lake Levels and Restoration Feasibility Study, New Zealand. Environment Canterbury, Ngai Tahu, and Ministry for the Environment. Managing and performing a comprehensive feasibility study of engineered lake levels for restoration of Lake Ellesmere, one of New Zealand’s most polluted lakes. This is an intermittently opened and closed shallow coastal lake/wetlands highly impacted by agricultural nonpoint source nutrient pollution. The project includes evaluating alternatives for a permanent engineered opening structure, and optimum lake levels and operating regimes to minimize flooding of adjacent farmland and maximize ecosystem restoration. It involves detailed 3-dimensional hydrodynamic modeling using Delft3D to evaluate effects of the alternative openings and lake levels and aid conceptual design. The project also includes evaluating relationships between water quality, sediment, lake levels and other environmental factors; identifying all lake values and ecosystem services; developing a feasibility assessment and decision tool; analyzing impacts of alternative openings and levels on these values and services; and preparing a comprehensive report.
US EPA Region 8 Aquatic Resources Restoration. Colorado, Montana, North Dakota, South Dakota, Utah, and Wyoming. Program manager for mitigation and restoration of wetlands, streams and rivers, and lakes impacted by all kinds of development activities and pollution across the region. Worked closely with the US Army Corps of Engineers, States, Indian tribes, nonprofit organizations, and other Federal agencies on restoration policy, science, design and implementation, monitoring, and evaluation of effectiveness. Led strategic planning and development of annual work plans, budgets, and reports for this work.
Restoration and Enhancement of Rivers and Aquatic Ecosystems, Otago, New Zealand. Otago Regional Council. Directed the restoration of riparian/floodplain areas and wetlands, water quality, aquatic ecology, geomorphology, and hydrologic and hydraulic function of a range of aquatic ecosystems throughout the region, including rivers severely modified by channelisation, flood control works, and floodplain encroachment. Also included enhancement of aesthetics and recreational opportunities. Involved comprehensive hydrologic/hydraulic modelling; water quality, ecologic and geomorphologic investigations; conceptual and final design, extensive public/community consultation, and construction management. Implementation included planting native vegetation, providing access to water and recreational opportunities, and channel and bank reconstruction for flood and low flows and aquatic habitat including using boulder weirs, pools, runs, riffles, and erosion control structures.