Common use of Instream Flow Requirements Clause in Contracts

Instream Flow Requirements. Marysville Gage (cfs) Schedule OCT 1-15 16-31 NOV 1-30 DEC 1-31 JAN 1-31 FEB 1-29 MAR 1-31 APR 1-15 16-30 MAY 1-15 16-31 JUN 1-15 16-30 JUL 1-31 AUG 1-31 SEP 1-30 Total Annual Volume (AF) 1 500 500 500 500 500 500 700 1000 1000 2000 2000 1500 1500 700 600 500 574200 2 500 500 500 500 500 500 700 700 800 1000 1000 800 500 500 500 500 429066 3 500 500 500 500 500 500 500 700 700 900 900 500 500 500 500 500 398722 4 400 400 500 500 500 500 500 600 900 900 600 400 400 400 400 400 361944 5 400 400 500 500 500 500 500 500 600 600 400 400 400 400 400 400 334818 6 000 000 000 350 350 350 350 350 500 500 400 300 150 150 150 350 232155 * Indicated flows represent average volumes for the specified time period. Actual flows may vary fromthe indicated flows according to established criteria. * Indicated Schedule 6 flows do not include an additional 30 TAF available fromgroundwater substitution to be allocated according to established criteria. Smartville Gage (cfs) Schedule OCT 1-15 16-31 NOV 1-30 DEC 1-31 JAN 1-31 FEB 1-29 MAR 1-31 APR 1-15 16-30 MAY 1-15 16-31 JUN 1-15 16-30 JUL 1-31 AUG 1-31 SEP 1-30 Total Annual Volume (AF) A 700 700 700 700 700 700 700 700 - - - - - - - 700 - B 600 600 600 550 550 550 550 600 - - - - - - - 500 - * Schedule A used with Schedules 1, 2, 3 and 4 at Marysville. * Schedule B used with Schedules 5 and 6 at Marysville. FLOW SCHEDULE YEAR TYPES BASED ON THE NORTH YUBA INDEX FOR ESTABLISHING REQUIRED FLOWS IN THE LOWER YUBA RIVER FISHERIES AGREEMENT The water year hydrologic classification for the Yuba River to determine the flow requirements of Yuba County Water Agency’s water right permits shall be based on the North Yuba Index. Determinations of a year’s flow schedule year type shall be made in February, March, April, and May and for any subsequent updates. Flow Schedule North Yuba Index Year Type Thousand Acre-Feet (TAF) Schedule 1 Schedule 2 Schedule 3 Schedule 4 Schedule 5 Schedule 6 Conference 1400 1040 920 820 693 500 ● To ensure sufficient carryover storage in the event of a subsequent very dry year, a dry- year storage adjustment will be made. ● The dry-year storage adjustment will be made as follows: - If the September 30 New Bullards Bar Reservoir storage is less than 400,000 acre-feet, then the Marysville Gage instream-flow requirement will be 400 cfs from October 1 until the next February Bulletin 120 forecasts are available. - If the September 30 New Bullards Bar Reservoir storage is less than 450,000 acre-feet but greater than or equal to 400,000 acre-feet, then, the River Management Team may decide to adjust the Marysville Gage instream-flow requirement to 400 cfs from October 1 until the next February Bulletin 120 forecasts are available. - When the next February Bulletin 120 forecasts are available, the instream-flow requirements will be based on those forecasts. EXHIBIT 4

Instream Flow Requirements. Marysville Gage (cfs) Schedule OCT 1-15 16-31 NOV 1-30 DEC 1-31 JAN 1-31 FEB 1-29 MAR 1-31 APR 1-15 16-30 MAY 1-15 16-31 JUN 1-15 16-30 JUL 1-31 AUG 1-31 SEP 1-30 Total Annual Volume (AF) 1 500 500 500 500 500 500 700 1000 1000 2000 2000 1500 1500 700 600 500 574200 2 500 500 500 500 500 500 700 700 800 1000 1000 800 500 500 500 500 429066 3 500 500 500 500 500 500 500 700 700 900 900 500 500 500 500 500 398722 4 400 400 500 500 500 500 500 600 900 900 600 400 400 400 400 400 361944 5 400 400 500 500 500 500 500 500 600 600 400 400 400 400 400 400 334818 6 000 000 000 350 350 350 350 350 500 500 400 300 150 150 150 350 232155 * Indicated flows represent average volumes for the specified time period. Actual flows may vary fromthe indicated flows according to established criteria. * Indicated Schedule 6 flows do not include an additional 30 TAF available fromgroundwater substitution to be allocated according to established criteria. Smartville Gage (cfs) Schedule OCT 1-15 16-31 NOV 1-30 DEC 1-31 JAN 1-31 FEB 1-29 MAR 1-31 APR 1-15 16-30 MAY 1-15 16-31 JUN 1-15 16-30 JUL 1-31 AUG 1-31 SEP 1-30 Total Annual Volume (AF) A 700 700 700 700 700 700 700 700 - - - - - - - 700 - B 600 600 600 550 550 550 550 600 - - - - - - - 500 - * Schedule A used with Schedules 1, 2, 3 and 4 at Marysville. * Schedule B used with Schedules 5 and 6 at Marysville. FLOW SCHEDULE YEAR TYPES BASED ON THE NORTH YUBA INDEX FOR ESTABLISHING REQUIRED FLOWS IN THE LOWER YUBA RIVER FISHERIES AGREEMENT The water year hydrologic classification for the Yuba River to determine the flow requirements of Yuba County Water Agency’s water right permits shall be based on the North Yuba Index. Determinations of a year’s flow schedule year type shall be made in February, March, April, and May and for any subsequent updates. Flow Schedule North Yuba Index Year Type Thousand Acre-Feet (TAF) Schedule 1 Schedule 2 Schedule 3 Schedule 4 Schedule 5 Schedule 6 Conference 1400 1040 920 820 693 500 ● To ensure sufficient carryover storage in the event of a subsequent very dry year, a dry- year storage adjustment will be made. ● The dry-year storage adjustment will be made as follows: - If the September 30 New Bullards Bar Reservoir storage is less than 400,000 acre-feet, then the Marysville Gage instream-flow requirement will be 400 cfs from October 1 until the next February Bulletin 120 forecasts are available. - If the September 30 New Bullards Bar Reservoir storage is less than 450,000 acre-feet but greater than or equal to 400,000 acre-feet, then, the River Management Team may decide to adjust the Marysville Gage instream-flow requirement to 400 cfs from October 1 until the next February Bulletin 120 forecasts are available. - When the next February Bulletin 120 forecasts are available, the instream-flow requirements will be based on those forecasts. EXHIBIT 4The North Yuba Index is an indicator of the amount of water available in the North Yuba River at New Bullards Bar Reservoir that can be utilized to achieve flows on the Lower Yuba River through operations of New Bullards Bar Reservoir. The index is comprised of two components: (1) active storage in New Bullards Bar Reservoir at the commencement of the current water year and; (2) total inflow to New Bullards Bar Reservoir for the current water year, including diversions from the Middle Yuba River and Oregon Creek to New Bullards Bar Reservoir. The following is the definition of the index and the procedure for determining the index for each water year. Where: North Yuba Index = SaNBB + INBB SaNBB = New Bullards Bar Reservoir Active Storage The New Bullards Bar Reservoir Active Storage for determining the current year North Yuba Index equals the actual recorded amount of water in storage in New Bullards Bar Reservoir on September 30th of the previous water year minus the Federal Energy Regulatory Commission Project License minimum pool amount of 234,000 acre-ft. INBB = Forecasted Total Annual Inflow To New Bullards Bar Reservoir