Feasibility of Fish Passage at Alameda Creek Diversion Dam

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Feasibility of Fish Passage at Alameda Creek Diversion Dam1,500Water Year 2003Alameda Creek Observed FlowAlameda Creek Predicted FlowDaily Flow (cfs)1,000500011/1 12/1 1/1 2/1 3/1 4/1DateFigure B-13Arroyo Hondo, Alameda Creek Observed Mean Daily Flows and Predicted AlamedaCreek Mean Daily Flows for Water Year 20031,500Water Year 2004Alameda Creek Observed FlowAlameda Creek Predicted FlowDaily Flow (cfs)1,000500011/1 12/1 1/1 2/1 3/1 4/1DateFigure B-14Arroyo Hondo, Alameda Creek Observed Mean Daily Flows and Predicted AlamedaCreek Mean Daily Flows for Water Year 2004ACDD Passage June 2009 Page B-12
Appendix CTechnical Information on Minimum Viable Population SizeAppendix CTechnical Information on Minimum Viable Population SizeEcologists have developed several models to determine minimum viable population sizes. Thesemodels have been characterized as population viability analyses. The basic model used tocharacterize population growth iswhere,Nt+1 = λN t(1)N t+1 is the estimated population size in the next generation; λ is the rate of population growth; and N tis the number of breeding pairs currently in the population (i.e., initial population size). If λ=1 thepopulation is stable, if λ1 the population is growing (Taylor,1995).For salmonids, the growth rate of the population, λ, is dependent upon the proportion of individualssurviving from one life stage to the next, and can be expressed aswhere,λ = E ⋅ S(2)1⋅ S2⋅ Sy 3⋅ S4E = Eggs produced from previous generationS 1 = Egg to fry survivalS 2 = Fry to smolt survivalS 3 = Annual ocean survivaly = Years in ocean (since steelhead will spend at least 2 years at sea, y = 2)S 4 = migration to spawning ground survivalLife stage survival rates reported in the literature can be used to estimate λ; however, they are highlyvariable due to differences in inherited traits between populations as well as natural andanthropogenic environmental disturbances. For example, Moyle (1976) reports numbers of eggsranging from 200 to 12,000 per adult female, but the number is generally found to be around 2,000eggs per kilogram of adult body weight.If conservative assumptions are made for values of variables used to estimate the growth rate of thepopulation, λ, it is possible to estimate the number of adults that could potentially return if there wasenough spawning habitat to support 100 breeding females, N t , in the upstream tributaries of CalaverasReservoir. One hundred female steelhead producing at least 2,000 eggs per kilogram of body weight(weighing a minimum of 2.5 kilograms) could reportedly produce a total of 5,000 fertilized eggs, E.Estimates for egg to fry survival rates reported by Healey (1991) range from 14 to 94 percent inChinook salmon. Bradford (1995) reviewed the literature on Pacific salmon survival and reports anaverage egg to smolt survival of 7 percent. Healey (1991) reports average ocean survival rates of20 to 36 percent annually.ACDD Passage June 2009 Page C-1
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T E C H N I C A L M E M O R A N D U
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Feasibility of Fish Passage at Alam
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1.0 Introduction1 INTRODUCTION1.1 B
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24Alamo680DanvilleAlameda CreekWate
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oleyriesSanCalaveras Creekalaveras
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(a)(b)Alameda Creek Diversion Dam (
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2.0 Setting2.3.2.1 ALAMEDA CREEK DI
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2.0 Settingalmost never submerged;
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2.0 SettingRainbow trout are the sa
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2.0 SettingA number of future proje
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(a) A view of the navigation lock a
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(a) A pickup truck adapted for haul
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Approximately 1.8 miles toCalaveras
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Page 77 and 78: 6.0 Additional Considerations and A
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Page 89 and 90: 9.0 Report Preparation9 REPORT PREP
Page 91 and 92: 10.0 References10 REFERENCESAACE (A
Page 93 and 94: 10.0 ReferencesHayes, Darrel, 2001.
Page 95 and 96: 10.0 ReferencesSak, B., San Francis
Page 97: 10.0 ReferencesWDFW (Washington Dep
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Feasibility of Fish Passage at Alameda Creek Diversion Dam

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