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Water Management Water Management Water Management International Souris River Board International Souris River Board of the International Joint Commission of the International Joint Commission No. ISRB-2009C No. ISRB-2009C The International Souris River Board has a role in managing the waters of the Souris River basin through its mandates The International Souris River Board has a role in managing the waters of the Souris River basin through its mandates for flow apportionment and flood control. The ISRB monitors the flows and levels in the rivers and the elevations of the for flow apportionment and flood control. The ISRB monitors the flows and levels in the rivers and the elevations of the reservoirs. Sometimes monitoring shows that flows and levels will exceed or fall below values set by the International reservoirs. Sometimes monitoring shows that flows and levels will exceed or fall below values set by the International Joint Commission (IJC) administering the Boundary Waters Treaty. In such instances, the ISRB advises the operators of Joint Commission (IJC) administering the Boundary Waters Treaty. In such instances, the ISRB advises the operators of the control dams to make adjustments. the control dams to make adjustments. The schematic below shows the main features of the Souris Basin: The schematic below shows the main features of the Souris Basin: Moose Mountain Lake Moose Mountain Lake Souris River outlet Souris River outlet to the to the Assiniboine River Assiniboine River Nickie Lake Rafferty Alameda Nickie Lake Rafferty Alameda Reservoir Reservoir Reservoir Reservoir Diversion canal Diversion canal Boundary Boundary Reservoir Reservoir Canada Canada USA USA Long Creek Lake Darling Long Creek Lake Darling Wildlife refuge dams Wildlife refuge dams USF & W pools USF & W pools Legend Legend Dam & reservoir Dam & reservoir Flow control point Flow control point Direction of flow Direction of flow Apportionment points Souris River Apportionment points Souris River The Rules for Apportionment of the water The Rules for Apportionment of the water A set of rules negotiated through the IJC governs the sharing of the water of the Souris Basin. The main points are: A set of rules negotiated through the IJC governs the sharing of the water of the Souris Basin. The main points are: • The annual flow of Long Creek from North Dakota into Saskatchewan shall not be less than Long Creek’s flow from • The annual flow of Long Creek from North Dakota into Saskatchewan shall not be less than Long Creek’s flow from Saskatchewan into North Dakota. Saskatchewan into North Dakota. • The annual flow of the Souris River from Saskatchewan to North Dakota shall be at least 50 percent of flow that would • The annual flow of the Souris River from Saskatchewan to North Dakota shall be at least 50 percent of flow that would have occurred naturally. In wet years it may be only 40 percent to account for evaporation from the reservoirs in have occurred naturally. In wet years it may be only 40 percent to account for evaporation from the reservoirs in Saskatchewan and for the flood control benefits to North Dakota. Saskatchewan and for the flood control benefits to North Dakota. • There shall be a minimum flow of the Souris River of 4 cubic feet per second (cfs) or 0.113 cubic meters per second (m3s) • There shall be a minimum flow of the Souris River of 4 cubic feet per second (cfs) or 0.113 cubic meters per second (m3s) flowing from Saskatchewan to North Dakota. Minimum flows may fall below 4cfs if it would have occurred naturally flowing from Saskatchewan to North Dakota. Minimum flows may fall below 4cfs if it would have occurred naturally without Boundary, Rafferty, and Alameda reservoirs. without Boundary, Rafferty, and Alameda reservoirs. • The timing of the flows of the Souris River from Saskatchewan to North Dakota should be close to natural conditions or • The timing of the flows of the Souris River from Saskatchewan to North Dakota should be close to natural conditions or for the most beneficial use of North Dakota, which could include holding back flows to reduce flooding, or until they for the most beneficial use of North Dakota, which could include holding back flows to reduce flooding, or until they would be more useful. would be more useful. • From May to October, at least 20 cfs (0.566 m3s) shall flow in the Souris River from North Dakota to Manitoba. During • From May to October, at least 20 cfs (0.566 m3s) shall flow in the Souris River from North Dakota to Manitoba. During severe drought conditions, the ISRB can set a lower number. severe drought conditions, the ISRB can set a lower number. continued continued page 2 page 2 Water Management - International Souris River Board Water Management - International Souris River Board of the International Joint Commission No. ISRB-2009C of the International Joint Commission No. ISRB-2009C What is Natural Flow? What is Natural Flow? Several of the rules are based on “natural flows.” Because of the reservoirs, irrigation and towns the flows are not entirely Several of the rules are based on “natural flows.” Because of the reservoirs, irrigation and towns the flows are not entirely “natural”. To determine what flows would have occurred naturally in the creeks and rivers, hydrologists use natural flow “natural”. To determine what flows would have occurred naturally in the creeks and rivers, hydrologists use natural flow balance sheets (see box). They monitor and record the conditions, making calculations every two weeks. At the end of balance sheets (see box). They monitor and record the conditions, making calculations every two weeks. At the end of December they calculate the annual tally. December they calculate the annual tally. Natural Flow Balance Sheet Calculation Natural Flow Balance Sheet Calculation Evaporation Withdrawals Pumping Flows Change Evaporation Withdrawals Pumping Flows Change Measured Measured from for into returning of storage from for into returning of storage Streamflow Streamflow Reservoirs Irrigation Towns to the river in reservoirs Reservoirs Irrigation Towns to the river in reservoirs from towns & irrigation from towns & irrigation Natural Streamflow Natural Streamflow Decision factors Decision factors The ISRB meets several times a year. Many factors are considered in their deliberations, among them: The ISRB meets several times a year. Many factors are considered in their deliberations, among them: • Possibility of floods or droughts • Possibility of floods or droughts • Levels in main reservoirs • Levels in main reservoirs • Compliance of flows to the apportionment targets • Compliance of flows to the apportionment targets • Accumulated apportionment deficits • Accumulated apportionment deficits • Needs of towns and agriculture • Needs of towns and agriculture • Optimum flows and levels for the wildlife reserves • Optimum flows and levels for the wildlife reserves • Minimum flows for water quality • Minimum flows for water quality • Changes in any water use projects in the basin. • Changes in any water use projects in the basin. The board sends its decisions to the agencies that operate the valves and flow gates at the control dams. The board sends its decisions to the agencies that operate the valves and flow gates at the control dams. Broader issues of water management do arise, including diversion projects, water quality, and flood forecasting. They are Broader issues of water management do arise, including diversion projects, water quality, and flood forecasting. They are reviewed by the ISRB to give recommendations to the IJC. reviewed by the ISRB to give recommendations to the IJC. The International Souris River Board is a board of the International Joint Commission The International Souris River Board is a board of the International Joint Commission of the Boundary Waters Treaty of the Boundary Waters Treaty Contacting the ISRB Contacting the IJC Contacting the ISRB Contacting the IJC Canadian address American address Canadian address American address Canadian address American address Canadian address American address Canadian co-secretary, American co-secretary, Canadian Section Office (Ottawa) U. S. Section Office (Washington) Canadian co-secretary, American co-secretary, Canadian Section Office (Ottawa) U. S. Section Office (Washington) International Souris River Board International Souris River Board International Joint Commission International Joint Commission International Souris River Board International Souris River Board International Joint Commission International Joint Commission Transboundary Waters Unit Water Resource Engineer Public Affairs Adviser Public Information Officer Transboundary Waters Unit Water Resource Engineer Public Affairs Adviser Public Information Officer Environment Canada North Dakota State Water Commission 234 Laurier Avenue West, 22nd 2401 Pennsylvania Avenue, NW Environment Canada North Dakota State Water Commission 234 Laurier Avenue West, 22nd 2401 Pennsylvania Avenue, NW Floor Fourth Floor Floor Fourth Floor 2365 Albert St., Rm. 300 900 East Boulevard Avenue, Dept 770 Ottawa, ON Canada K1P 6K6 Washington, DC USA 20440 2365 Albert St., Rm. 300 900 East Boulevard Avenue, Dept 770 Ottawa, ON Canada K1P 6K6 Washington, DC USA 20440 Regina, SK, Canada S4P 4K1 Bismarck, ND, USA 58505-0850 Regina, SK, Canada S4P 4K1 Bismarck, ND, USA 58505-0850 Phone: 613-947-1420 Phone: 202-736-9024 Phone: 613-947-1420 Phone: 202-736-9024 Phone: 306-780-5040 Phone: 701-328-2756 Fax: 613-993-5583 Fax: 202-254-4562 Phone: 306-780-5040 Phone: 701-328-2756 Fax: 613-993-5583 Fax: 202-254-4562 [email protected] [email protected] [email protected] [email protected] http://www.ijc.org http://www.ijc.org.
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