MEMORANDUM. Agnes Lut, OR-DEQ. Margaret Filardo. DATE: May 23, Spill in 2007 and Forebay Monitors
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1 FISH PASSAGE CENTER 1827 NE 44 th Ave., Suite 240, Portland, OR Phone: (503) Fax: (503) us at MEMORANDUM TO: Agnes Lut, OR-DEQ FROM: Margaret Filardo DATE: May 23, 2007 RE: Spill in 2007 and Forebay Monitors Earlier this month I pointed out to you that the forebay monitor at Ice Harbor Dam was limiting spill at Lower Monumental Dam, and that similar problems existed at The Dalles and Camas/Washougal monitors. You asked that I elaborate on the issues and this memo is in response to your request. The FPC has developed an interactive link on our web page that shows the spill provided at each project relative to the Court Order, along with both the tailrace TDG at the project and the forebay TDG levels at the next downstream project relative to the 115/% criteria. You will note from the graphs that often spill volume is limited by the forebay monitors, when tailrace monitors read levels of TDG that are much below the tailrace criteria. For example, if you consider the spill provided at John Day Dam, the Court Order calls for 60% of instantaneous flow to be spilled. The provision of spill at John Day Dam has met the Court Order only a few times thus far this year. The restriction of spill is most often based on the forebay TDG readings at The Dalles Dam (the tailrace monitor exceeded the % TDG by 0.1% on 3 of the 54 days thus far this season). Using the TDG data the COE sets a spill cap that establishes a maximum amount of spill that can occur at the John Day project. Essentially this COE spill cap has limited the amount of spill at John Day Dam so that the Court s Order of 60% instantaneous spill during nighttime hours cannot be met. The following table was extracted from the COE website. The table is included here to
2 demonstrate that the daily average 12 hour high tailwater TDG variation at John Day Dam (JHAW) has been very small (usually varying less than 1% day to day) while the downstream forebay TDG has varied quite a lot (as much as 5% day to day). In fact, the tailrace monitor most often reads near 118% and could allow the implementation of the Court Order without exceeding the %. Similarly, the Court Order calls for 100 Kcfs spill at Bonneville Dam. You will see from the graphs that often the Court Order is not being implemented most often due to TDG at Camas/Washougal, while the tailrace monitor is reading below the %. Attached are graphs showing spill thus far this season at John Day and Bonneville dams. While these graphs show the seasonal trend in spill relative to the Court Order, the graphs on the Fish Passage Center web page show the same data in weekly blocks that are somewhat easier to read. There are also comments associated with each day describing the TDG levels and spill implementation. We realize the generation of TDG is due to several processes and the impact of the biological and physical processes is difficult to predict on a real-time basis. However, we hope that this memo explains some of our concern with the present use of the forebay monitors to represent the total dissolved gas generated from spill at upstream projects. If we can provide any additional information please let us know. 2
3 Date Gas Cap % Average percent TDG for 12 highest hours - May 2007 Monitoring Stations (full list) LWG LGNW LGSA LGSW LMNA LMNW IHRA IDSW MCNA MCPW JDY JHAW TDA TDDO BON CCIW WRNO CWMW /01/ /02/ /03/ /04/ /05/ /06/ /07/ /08/ /09/ /10/ /11/ /12/ /13/ /14/ /15/ /16/ /17/ /18/ /19/ /20/ /21/ /22/ /23/ /24/ /25/ /26/ /27/ /28/ /29/ /30/ /31/ Generated: Tue May 22 11:25: Number of hours of data reported in a given day Big, bold, red text denotes exceedances. --- indicates No Data Dates run from hour 1 to 24 (not 0 to 23). The gas caps shown only apply when spilling to facilitate juvenile fish passage ("voluntary spill") between April 3rd and August 31st. At all other times, the gas cap is %.
4 John Day Spill (Kcfs) Total Dissolved Gas (%) /10 4/17 4/24 5/1 5/8 5/15 5/22 Date Court Order Spill (0/60%) Actual Spill 12-hr TDA Forebay Forebay Gas Cap (115%) 12-hr JDA Tailrace Tailrace Gas Cap (%)
5 Bonneville Spill (Kcfs) Total Dissolved Gas (%) /10 4/17 4/24 5/1 5/8 5/15 5/ Date Court Order Spill (100kcfs/100kcfs) Actual Spill 12-hr Camas/Wash Camas/Wash Waiver (115%) 12-hr Cascade Island Cascade Island Waiver (%)
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