Low Summer Flow Experiment - Revision history

Cellsworth at 16:09, 11 December 2019

2019-12-11T16:09:37Z

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 *Increased [http://gcdamp.com/index.php?title=GCDAMP_Sediment sediment transport] during the high releases in the months prior to the LFS test in order to get the annual volume commitment to the Lower Basin.
 *Increased potential for [http://gcdamp.com/index.php?title=Nonnative_Invasive_Aquatic_Species nonnative fish and parasites] to proliferate throughout the Grand Canyon and impact humpback chub and other native fish populations.
-*The cost to hydropower users from [http://gcdamp.com/index.php?title=The_2000_Low_Summer_Steady_Flow_Experiment '''the 2000 Low Summer Steady Flow Experiment'''] was estimated to be $26.4 M, which probably made it the single most expensive science experiment in US history.
+*The cost to hydropower users from [http://gcdamp.com/index.php?title=The_2000_Low_Summer_Steady_Flow_Experiment '''the 2000 Low Summer Steady Flow Experiment'''] was estimated to be $26.4 M, which probably made it the single most expensive environmental science experiment in US history.
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 *Commercial fishing guides in Lees Ferry lost business during the habitat maintenance flows
 *Increased costs of approximately $26.4 million to power users
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 *It may be difficult to schedule mid-year monthly releases in order to meet annual release requirements. Monthly volumes of October-December are typically pre-determined to release 2.0 MAF. Annual release volumes are typically only set after the April 1 inflow forecasts leaving April, May, and June as the only months water could be moved into from July, August, and September for the LSF.
 *Short notice for science planning to monitor affects. One of the primary flaws with [http://gcdamp.com/index.php?title=The_2000_Low_Summer_Steady_Flow_Experiment '''the 2000 Low Summer Steady Flow Experiment'''] was that due to the short amount of time available for planning and implementation and the lack of long-term monitoring, scientists were unable to determine whether or not the experiment achieved its objectives.
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 *The high abundance of salmonids in the mainstem before the experiment and predation by them may have affected the number and size of native fish that were caught.
 *Native larval fish survival in the tributaries that is unrelated to mainstem environments and flow manipulations also can affect relative abundance observed in the mainstem.
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 The experiment would '''not''' be conducted if:
 # Release temperatures were too low to reach 14°C at Little Colorado River confluence even with going to a minimum flow of 5,000 to 8,000 cfs, or
-# Release temperature were predicted to be high enough in July, August, or September to reach 14°C at Little Colorado River confluence under normal operations.
+# Release temperatures were predicted to be high enough in July, August, or September to reach 14°C at Little Colorado River confluence under normal operations.
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-Low summer flows (minimum daily mean 5,000 to 8,000 cfs) for three months (July, August, and September) and only in the second 10 years of the LTEMP period (2026-2036) to target a temperature of ≥14°C at Little Colorado River confluence to benefit humpback chub and other native species. <br>
+Low summer flows (minimum daily mean 5,000 to 8,000 cfs) for three months (July, August, and September) and only in the second 10 years of the LTEMP period (2026-2036) for the purpose of achieving warmer river temperatures of ≥14°C at Little Colorado River confluence to benefit humpback chub and other native species. <br>
 The experiment would '''not''' be conducted if:

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 *[http://gcdamp.com/index.php?title=The_2000_Low_Summer_Steady_Flow_Experiment The 2000 Low Summer Steady Flow Experiment]
 *[http://gcdamp.com/index.php?title=TEMPERATURE Temperature Page]
 *[http://gcdamp.com/index.php?title=Humpback_Chub_Page Humpback Chub Page]