Clint AD Alexander

ESSA Technologies Ltd

Management of the Sacramento River and Sacramento-San Joaquin Delta (SRD) is one of California's greatest challenges, requiring trade-offs between valued components that serve a multiplicity of conflicting purposes. Trade-offs do not signal a failure to create clever enough models, or scenarios that find a single optimal solution. Rather, an optima...

The Ecological Flows Tool (EFT) is a decision support framework for developing and testing how flow management alternatives and other actions change physical habitats and influence multiple ecological targets. Through the management of Shasta dam releases and Delta export pumping and application of a novel “turn taking” optimization approach, EFT i...

The British Columbia Water Sustainability Act (WSA) came into force on February 29, 2016 and replaces the Water Act. The WSA brings a formal requirement to consider Environmental Flow Needs (EFN) for new water licence applications for surface water and groundwater authorizations. Limited procedural guidance to government staff and applicants on how...

The Okanagan Valley of British Columbia (BC) has one of the lowest per-capita water supplies in Canada. Large fluctuations in water supplies routinely induce seasonal extremes of flood and drought conditions that challenge the ability of decision makers to operate complex water management infrastructure (dams, dikes, irrigation networks, flood cont...

Alexander, C.A.D., and K. D. Hyatt eds. 2015. Peer Review Workshop for the Okanagan Sockeye Re-introduction Experiment. Final Draft. Workshop summary report to the Okanagan Nation Alliance. 101-3535 Old Okanagan Highway, Westbank, BC V4T 3L7. 125 p. Individuals who generated the original work and ideas summarized herein include (reverse alphabetic...

Beginning with the launch of the current phase of this project in October 2008 and extending through to its conclusion in 2014, the Ecological Flows Tool (EFT) project has had the goal of improving water planning in the Sacramento River and the San Joaquin-Sacramento Delta. The waters which flow through these two ecoregions are among the most highl...

The Ecological Flows Tool (EFT) is a decision support system that demonstrates how changes in flow management (and other actions) result in changes to the physical habitats for multiple species within the Sacramento River and the San Francisco Delta. This document provides the as-built Record of Design for the focal species and habitat indicators d...

ESSA Technologies Ltd. 2013. Integrated Water Management in the Colorado River Basin: Evaluation of Decision Support Platforms and Tools. Final Report. Prepared by ESSA Technologies Ltd., Vancouver, BC for The Nature Conservancy, Colorado River Program, CO. 108 p. + appendices.

Alexander, C.A.D., K. Hyatt and B. Symonds, eds. 2013. The Okanagan Fish/Water Management Tool (v.2.4.000): Guidelines for Apprentice Water Managers. Prepared for Canadian Okanagan Basin Technical Working Group, Kamloops, BC. 129 pp.

The Okanagan fish-and-water management tool (Ok-FWMT) is a coupled-set of 4 biophysical models of key relationships among climate, fish and water that interact with a 5th water-management rules model used to predict consequences of water management decisions for fish and other water users. Ok-FWMT software allows system users to explore water manag...

During 2001, the Canadian Okanagan Basin Technical Working Group initiated a fish-and-water management tools project to develop a quantitative decision-support system (FWMT-DSS) to reduce uncertainties and improve the basis for water management decisions influencing flood protection, fish production and other water use objectives. From the outset,...

Federal, provincial and Okanagan Nation Alliance (ONA) agencies are working together to conserve, protect and restore indigenous salmon populations to the Okanagan Basin. Since 1997, fisheries experts from these and other agencies have focused on developing a comprehensive implementation and monitoring program for re-introducing sockeye salmon to t...

With over 50 years of international concern about the effects of flow alteration on ecosystems, the continued advancement of scientifically based tools to quantify the ecological effects of flow regulation and river channel alterations has become a prominent research activity (e.g., Stalnaker 1994; Bunn and Arthington 2002; Annear et al. 2004; Veld...

High spawning flows from Hugh Keenleyside Dam (HKD) on the Columbia River results in dewatering of eggs in mountain whitefish (Prosopium williamsoni) populations, but the ultimate effect on adult abundance depends on the shape of the egg-to-adult recruitment curve. Our decision analysis assessed the benefits of alternative flow experiments while ac...

Alexander, C.A.D. and K.B. Garcia. 2011. Osoyoos Lake Water Science Forum Shared Water, Shared Future: Bridges to Sustainability for Osoyoos Lake. Summary Report prepared by ESSA Technologies Ltd., Kelowna, BC and Insight Environmental Consulting Ltd., Kelowna, BC for the Osoyoos Lake Water Science Forum Organizing Committee, Osoyoos, BC. 51 pp. +...

Porter, M., C. Alexander, K. Bryan, D. Carr, D. Marmorek, R. Smith, K. Wieckowski, and T. Hatfield. 2009. Instream flow needs analysis for the Okanagan Water Supply & Demand Project. Report prepared by ESSA Technologies Ltd. and Solander Ecological Research for the Okanagan Basin Water Board (OBWB), Coldstream, BC. 142 p.

Alexander, C.A.D. and D.C. Pickard 2009. Skaha Lake Experimental Sockeye Introduction: 4 year synthesis report. Prepared by ESSA Technologies Ltd., Vancouver, B.C. for The Canadian Okanagan Basin Technical Working Group, c/o Okanagan Nation Alliance, Westbank, 110 pp.

This Final Report synthesizes the results and analyses of the Sacramento River Ecological Flows Study (the “Study”), which was initiated by The Nature Conservancy (TNC) in collaboration with a team of ecologists, geomorphologists, and river management specialists from Stillwater Sciences, ESSA Technologies, the University of California (UC) Davis,...

The U.S. Bureau of Reclamation and ESSA Technologies Ltd. 2008. Evaluation of Environmental Water Program (EWP): Pilot Re-operation of Whiskeytown Dam Central Valley Project, California Mid-Pacific Region. Technical Memorandum No. WHI-8130-IE-2008-1. 100 p. + appendices.

Alexander, C.A.D. and K.A. Robson. 2007. Forum Summary Report - Osoyoos Lake Water Science Forum, September 16-18, 2007. Prepared by ESSA Technologies Ltd., Vancouver, B.C. for the Osoyoos Lake Water Science Forum Organizing Committee, Osoyoos, BC. 48 pp.

Alexander, C.A.D. 2003. First Nation sockeye catch estimates in the mid-Fraser River, 2002, with results of an impact analysis on the reduction of 24-hour effort surveys and aerial overflights. Prepared by ESSA Technologies Ltd., Vancouver, BC for the Canadian Department of Fisheries and Oceans, BC Interior Area Division, Kamloops, BC. 76 pp. + app...