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Table S-1.-Recommended Magnitudes and Duration of Maximum Spring Peak and Summer-to-Winter Base
<br />Flows and Temperatures for Endangered Fishes in the Green River Downstream From Flaming Gorge Dam
<br />as Identified in the 2000 Flow and Temperature Recommendations
<br /> Hydrologic Conditions and 2000 Flow and Temperature Recommendations'
<br /> Flow and
<br />Temperature Wetz Moderately Wet' Average° Moderately Drys Drys
<br />
<br />Location
<br />Characteristics (0-10% (10-30% 30-70% (70-90% (90-100%
<br /> Exceedance) Exceedance) ' E ceedance) Exceedance) Exceedance)
<br />Reach 1 Maximum Spring 28,600 cfs 24,600 cis 24,600 cis 24,600 cfs 24,600 cfs
<br />Flaming Gorge Peak Flow (244 cubic meters (130 m3/s) (130 m3/s) (130 m3/s) (130 m3/s)
<br />Dam to Yampa
<br />R per second [m3/s])
<br />iver
<br />Peak flow duration is dependent upon the amount of unregulated inflows into the Green River and the flows needed to achieve the
<br /> recommended flows in Reaches 2 and 3.
<br /> Summer-to- 1,800-2,700 cis 1,500-2,600 cis 800-2,200 cfs 800-1,300 cis 800-1,000 cis
<br /> Winter Base Flow (50-60 m3/s) (42-72 m3/s) (23-62 m3/s) (23-37 m3/s) (23-28 m3/s)
<br />Above Yampa Water 2 64 IF (18 °C) for z 64 IF (18 °C) for z 64 IF (18 °C) for 2 64 IF (18 °C) for z 64 IF (18 "C) for
<br />River Temperature 3-5 weeks from mid- 3-5 weeks from mid- 3-5 weeks from 3-5 weeks from 3-5 weeks from mid-
<br />Confluence Target August to March1 August to March 1 mid-July to March 1 June to March 1 June to March 1
<br />Reach 2 Maximum Spring 226,400 cfs 220,300 cfs z 18,600 cfsg 28,300 cfs 28,300 cis
<br />Yampa River Peak Flow (748 m3/s) (575 m3/s) (527 m3/s) (235 m3/s) (235 m3/s)
<br />to White River
<br /> 28,300 cfsh
<br /> (235 m3/s)
<br /> Peak Flow Flows greater than Flows greater than Flows greater than Flows greater than Flows greater than
<br /> Duration 22,700 cfs 18,600 cfs 18,600 cis (527 m3/s) 8,300 cis 8,300 cis (235 m3/s)
<br /> (643 m3/s) should be (527 m3/s) should be should be maintained (235 m3/s) should should be
<br /> maintained for maintained for for at 2 weeks in at be maintained for maintained for
<br /> 2 weeks or more, 2 weeks or more. least 1 of 4 average at least 1 week. 2 days or more
<br /> and flows. 18,600 cfs years. except in extremely
<br /> (527 m3/s) for dry years
<br /> 4 weeks or more. (98% exceedance).
<br /> Summer-to- 2,800-3,000 cfs 2,400-2,800 cis 1,500-2,400 cis 1,100-1,500 cfs 900-1,100 cfs
<br /> Winter Base Flow (79-85 m3/s) (69-79 m3/s) (43-67 m3/s) (31-43 m3/s) (26-31 m3/s)
<br />Below Yampa Water Green River should Green River should Green River should be Green River should Green River should
<br />River Temperature be no more than 9 IF be no more than 9 IF no more than 9 IF be no more than be no more than 9 IF
<br />Confluence Target (5 °C) colder than (5 °C) colder than (5 °C) colder than 9 IF (5 °C) colder (5 °C) colder than
<br /> Yampa River during Yampa River during Yampa River during than Yampa River Yampa River during
<br /> summer base flow summer base flow summer base flow during summer summer base flow
<br /> period. period. period. base flow period. period.
<br />Reach 3 Maximum Spring 239,000 cfs 224,000 cfs 222,000 cfs9 28,300 cfs 28,300 cfs
<br />White River to Peak Flow (1,104 m3/s) (680 m3/s) (623 m3/s) (235 m3/s) (235 mils)
<br />Colorado River
<br /> Peak Flow Flows greater than Flows greater than Flows greater than Flows greater than Flows greater than
<br /> Duration 24,000 cis 22,000 cis 22,000 cis (623 m3/s) 8,300 cis 8,300 cfs (235 m3/s)
<br /> (680 m3/s) should be (623 m3/s) should be should be maintained (235 m3/s) should should be
<br /> maintained for maintained for for 2 weeks in at least be maintained for maintained for
<br /> 2 weeks or more, 2 weeks or more. 1 of 4 average years. at least 1 week. 2 days or more
<br /> and flows 22,000 cfs except in extremely
<br /> (623 m3/s) for dry years
<br /> 4 weeks or more. (98% exceedance).
<br /> Summer-to-
<br />1 3,200-4,700 cfs 2,700-4,700 cis 1,800-4,200 cfs 1,500-3,400 cis 1,300-2,600 cfs
<br /> W inter Base Flow (92-133 m3/s) (76-133 m3/s) 1 (52-119 m3/s) (42-95 m3/s) (32-72 m3/s)
<br />' Recommended flows as measured at the United States Geological Survey gauge located near Greendale, Utah, for Reach 1; Jensen, Utah, for
<br />Reach 2; and Green River, Utah, for Reach 3.
<br />2 Wet (0% exceedance): A year in which the forecasted runoff volume is larger than almost all of the historic runoff volumes. This hydrologic
<br />condition has a 10% probability of occurrence.
<br />3 Moderately Wet (10-30% exceedance): A year in which the forecasted runoff volume is larger than most of the historic runoff volumes. This
<br />hydrologic condition has a 20% probability of occurrence.
<br />4 Average (30-70% exceedance): A year in which the forecasted runoff volume is comparable to the long-term historical average runoff volumes.
<br />s Moderately Dry (70-90% exceedance): A year in which the forecasted runoff volume is less than almost all of the historic runoff volumes. This
<br />hydrologic condition has a 20% probability of occurrence.
<br />e Dry (90-100% exceedance): A year in which the forecasted runoff volume is less than almost all of the historic runoff volumes. This hydrologic
<br />condition has a 100/6 probability of occurrence.
<br />Recommended flows. 218,600 cfs (527 m3/s) in 1 of 2 average years.
<br />3 Recommended flows 28,300 cfs (235 m3/s) in other average years.
<br />Recommended flows 222,000 cis (623 m3/s) in 1 of 2 average years.
<br />Executive Summary .- S-17
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