Upper Hudson/Sacandaga River Offer of Settlement

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Presentation transcript:

Upper Hudson/Sacandaga River Offer of Settlement Great Sacandaga Lake – Release Determination Process Determine current flow in Hudson River at Hadley Gauge Determine current flow in Sacandaga River at Hope Gauge Determine starting reservoir elevation (midnight elevation) Estimate daily average flow at Hadley Step 1 Estimate daily average reservoir inflow Estimate daily average release Calculate Hudson River flow below confluence with Sacandaga River (sum of daily average flow at Hadley and daily average release) Calculate change in reservoir elevation (change in storage volume) Calculate daily average reservoir elevation (24hr period) Determine “Level” using Appendix E Tables (interpolate value) Determine maximum allowable flow for Sacandaga River based on daily average reservoir elevation Section 3, Table F Determine minimum and maximum allowable flow for Hudson River below confluence with Sacandaga River Determine minimum allowed Hudson River flow based on “Level” Section 3, Table C Determine maximum allowed Hudson River flow based on “Level” Section 3, Table E Determine maximum allowed Hudson River flow based on daily average reservoir elevation Section 3, Table D Confirm Compliance with Settlement Rules Is the daily average release below maximum allowed by Section 3, Table F? Is the Hudson River flow above minimum allowed by Section 3, Table C? Is the Hudson River flow below maximum allowed by Section 3, Table E? Is the Hudson River flow below maximum allowed by Section 3, Table D? Yes Yes Yes No No No No Yes Does the daily average release produce the desired daily average reservoir elevation, (ie, Target Level 3)? No Schedule the Daily Average Release Yes Increase daily average release Yes Is the daily average reservoir elevation higher than Target Level 3 elevation? No Decrease daily average release Change daily average release Go to Step 1 Repeat Process for the next day The release of water from the Great Sacandaga Lake is dependent upon inflow, reservoir elevation, the natural flow in the Hudson River, and the need to provide river regulation. Meteorological and hydraulic events may warrant deviation from, or preclude the use of, the procedure outlined above. Offer of Settlement Flow Chart - Single Page.ppt