1. Revitalization of Rivers in the United States Using Dam Removal Tim Randle, M.S., P.E., D.WRE. Manager, Sedimentation and River Hydraulics Group

2. Dams come in a variety of sizes, they serve a variety of purposes, and they have a variety of impacts.

6. Nearly 81,000 major dams in the United States (2005)

16. Why should reservoir sediment be considered?

21. Reservoir Stabilization

22. When is reservoir sediment a problem?

24. Reservoir Sediment Trap Efficiency Ratio of reservoir size to mean annual inflow

26. United States of America Chiloquin Dam, OR Savage Rapids Dam, OR Elwha and Glines Canyon Dams, WA Case Studies

32. Chiloquin Dam, July 2008

33. Chiloquin Dam, August 2008

34. Chiloquin Dam, August 2008

41. Savage Rapids Dam, April 2009

46. Pilot Channel Excavation

50. 8:00 10:00 12:00 14:00 16:00 10 September 2010

51. Savage Rapids Dam Oct 2009

52. Savage Rapids Dam Jan 2010

53. Sediment deposition at the pumping plant intake had to be excavated

55. Elwha River, Washington

56. Elwha River

57. Elwha River Seattle Washington Pacific Ocean

58. Elwha Dam (7.9 km) Glines Canyon Dam (21.7 km) 840 km 2 100 km of tributaries Lower Elwha Tribal Reservation Strait of Juan de Fuca Lake Sutherland Lake Aldwell Port Angeles Lake Mills

65. Historic Elwha River before the Dams

75. Reservoir Sedimentation Lake Aldwell Lake Mills Deltas

77. Reservoir Sediment Grain Size Distribution: Lake Aldwell Lake Mills Silt & Clay Silt & Clay Sand Sand Gravel Gravel Cobble Cobble

82. Fish Windows Dam removal and reservoir drawdown will be temporarily halted during fish window time periods: May - June, Aug - Sep, Nov - Dec

85. New Diversion Weir

86. Clarifying Tanks Sludge Outfall Diversion Pump Structure Elwha Water Treatment Plant River Flow

88. Glines Canyon Dam Elwha River, WA

89. Glines Canyon Dam Removal 15 m 7.6 m

90. Glines Canyon Dam – Arch Removal (Artist Rendition) Glines Canyon Dam Removal

92. Elwha Dam Removal (Artist Rendition)

93. Elwha Dam Removal El. 48.8 m El. 46.3 m El. 43.9 m El. 41.1 m El. 51.8 m El. 54.2 m 9.1 m

95. 1994 Lake Mills Drawdown Experiment 6 m over 1 week constant for 1 week

97. 4/09/94 4:02 pm, 179.5 m, 33.7 m 3 /s, 5 mg/L Q s Lower Delta

98. 4/10/94 8:02 am, 178.9 m, 30.9 m 3 /s Lower Delta

99. 04/11/94 8:02 am, 178.0 m, 29.4 m 3 /s Lower Delta

100. 04/12/94 8:02 am, 177.1 m, 30.3 m 3 /s Lower Delta

101. 4/13/94 8:02 am, 176.2 m, 28.6 m 3 /s, 2,010 mg/L Q s Lower Delta

102. 4/14/94 8:02 am 175.3 m, 26.4 m 3 /s, 1,990 mg/L Q s Lower Delta

103. 4/15/94 12:46 pm, 174.6 m, 25.2 m 3 /s, 2,200 mg/L Q s Lower Delta

104. 4/16/94 12:46 pm, 174.3 m, 26.3 m 3 /s, 5,210 mg/L Q s Lower Delta

105. 4/17/94 12:46 pm, 174.3 m, 32.6 m 3 /s Lower Delta

106. 4/18/94 12:46 pm, 572.0 m, 41.9 m 3 /s, 1,720 mg/L Q s Lower Delta

107. 4/19/94 12:46 pm, 572.0 m, 49.8 m 3 /s Lower Delta

108. 4/20/94 12:46 pm, 174.3 m, 43.6 m 3 /s, 1,555 mg/L Q s Lower Delta

109. 4/23/94 10:31 am, 174.3 m, 36.8 m 3 /s Lower Delta

111. Reservoir Erosion Model Existing sediment Predam river bed Lake Mills Profile

112. Lake Mills Planform

113. Lake Mills Elevation

114. Lake Mills Discharge Water Discharge (m 3 /s)

115. Lake Mills Sediment Concentration

116. 3.36 km = 10.8 m Horizontal scale = 1 : 310 Chris Bromley University of Nottingham / Oregon State University University of Minnesota Saint Anthony Falls Laboratory

117. 1,070 m = 3.5 m Horizontal scale = 1 : 310 Chris Bromley University of Nottingham / Oregon State University University of Minnesota Saint Anthony Falls Laboratory

118. Lake Mills Physical Model Experiment Chris Bromley University of Nottingham / Oregon State University

119. R11 3x - center 0 of 21

120. R11 3x - center 3 of 21

121. R11 3x - center 6 of 21

122. R11 3x - center 9 of 21

123. R11 3x - center 12 of 21

124. R11 3x - center 15 of 21

125. R11 3x - center 18 of 21

126. R11 3x - center 21 of 21

128. Erosion Along Delta Margin

130. Erosion Along Center Pilot Channel

131. Erosion Along Center Pilot Channel

136. 2001

140. Possible WEB Camera Views

143. Thank you Obrigado!