Sediment Management for Dam Removals
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1 Sediment Management for Dam Removals As Presented To: Sediment Management for Dam Removals, A Hands on Workshop on the Latest Techniques for Dam Modification and Removal, Purdue University Calumet, IN, April 18, Sediment Management for Dam Removals, Marquette University Environmental Engineering Seminar, Milwaukee, WI November 20, Marty E. Rye, P.E.
2 Why Do We Care? Project Cost Permitting Environmental Concerns Liability Project Performance Aesthetics Recreational Use Economic Environmental Engineering (22%) Infrastructure Removal (30%) Sediment Mgmt (48%) Relative Magnitude of Costs for Dam Removal Elwha River, WA (Morris & Fan, 1997)
3 Purpose Of Presentation Briefly Describe Physical Process of Sedimentation Briefly Describe Options for Sediment Management for Dam Removal Some Data on Short-Term Impacts of Dam Removal on Downstream TSS Summary of Tools Needed to Ensure Responsible Dam Removal Sediment Management
4 Sedimentation Patterns Related to Several Conditions Hydrologic Conditions Stream Inlet Locations Sediment Characteristics Reservoir Geometry Outlet Design Operating Rule
5 Longitudinal Deposit Geometry Delta Tapering Wedge Uniform Morris & Fan, 1997
6 Physical Process of Sedimentation Pre-Dam Conditions Sediment Transport Continuity
7 Physical Process of Sedimentation New-Reservoir Conditions Interruption of Sediment Transport
8 Physical Process of Sedimentation Young Reservoir Conditions Coarser Sediment Drops Out at Upstream Limits
9 Physical Process of Sedimentation As the Reservoir Ages Sediment Delta Progresses Downstream Finer Sediment Deposited Near the Dam Face
10 Physical Process of Sedimentation As the Reservoir Ages Sediment Delta Progresses Downstream Finer Sediment Deposited Near the Dam Face
11 Physical Process of Sedimentation As the Reservoir Ages Sediment Delta Progresses Downstream Finer Sediment Deposited Near the Dam Face
12 Physical Process of Sedimentation Aged Reservoir Equilibrium is Reached Sediment Layers Finer Material Covered by Coarser Material Consolidation of Material
13 Impacts of Sediment Release Fisheries Benthic Organisms Municipal Water Supply Industrial / Agricultural Uses Water Treatment Morphology Conveyance Capacity
14 Deterministic Tools Are Limited Stochastic Phenomenon Dam Removal Similar to Flushing Operations Used for Reservoir Sediment Management Widely Used in France for Inspection Used in China as Part of Rule of Operation Published Data is Limited and Project Specific
15 Sediment Management Approaches for Dam Removal Minimal Management In-Place Stabilization Time Stepped Approach Excavation and Stabilization of Reservoir Sediments
16 Two Extremes in Timescale Yield Two Extremes in Sediment Management Geologic Time Scale
17 This Leads to the Rip n Run
18 Minimal Management Advantages Cheaper than Active Management of Sediment Easier to Design No Long-Term Construction and Monitoring Allows More Dams to be Removed Concerns Degraded Stream Reach Downstream Impacts Aesthetics Social Impacts
19 Engineering Time Scale Leads to a Full-Restoration
20 Full Restoration Aesthetic Advantages Restores Ecological Function Quickly Social Benefits Restores Capability of Stream to Adapt Engineering Objectives Can Be Met Resource Competition Delays Other Dam Removals $$ s Concerns
21 Choices within the Extremes In-Place Stabilization by Constructing an Over-Steepened Transition Channel or a Series of Transitions Ramp Steep Channel Step-Pool Series of Drops
22 Partial Restoration Advantages Initially Cheaper than Full-Restoration Provides Some Short-Term Function Aesthetic Benefits Minimizes Floodplain Sediment Migration (Contaminated Sediment) Concerns Is this River Restoration? Responsiveness Design Components / Design Standards Life-Cycle Costs / Maintenance
23 Time-Stepped Approach Dam Removal
24 Time-Stepped Approach Dam Removal Open Lower Gate
25 Time-Stepped Approach Dam Removal
26 Time-Stepped Approach Dam Removal
27 Time-Stepped Approach Dam Removal
28 Time-Stepped Removal Advantages Spreads the Impact Over Time Allows Downstream Natural Communities to Adapt Allows Floodplain Sediments to Dewater, Aerate, Consolidate, Vegetate Can Monitor Downstream Impacts During Process Concerns Does Not Explicitly Address Floodplain Sediment Removal Still Have An Incised System Can Get Stabilized by Vegetation Establishment Delaying Eventual Natural Rehabilitation
29 Impact of Storm Event on Channel Substrate Following Dam Removal Baraboo, WI (Stanley, Luebke, Doyle, Marshall, 2002)
30 Short-Term Impacts of Dam Removal on TSS Two Case Studies Mill Pond Dam on the Pomme de Terre River Frazee Dam on the Otter Tail River
31 Appleton Mill Pond Dam Removal Case History Pomme de Terre River in Western Minnesota Provided Power for Local Mill Site Concrete Rubble Dam Dam Ht = 17 ft Dam Length = 157 ft Size of Reservoir = 57 ac D.A. = 907 sq. miles Removed in Winter 1998
32 Appleton Dam Location
33 Appleton Dam Before Removal
34 Aerial Photo of Appleton Dam s Pool Dam
35 Appleton Dam After Removal
36 Frazee Dam Removal Case History Otter Tail River in Northwest Minnesota Dam Ht = 19 ft Dam Length = 60 ft D.A. = sq. miles Removed in Winter 1998
37 Frazee Dam Location
38 Frazee Dam Before Removal
39 Aerial Photo of Frazee Dam Pool Before Removal Dam
40 Frazee Dam Site After Removal
41 T.H. 87 Crossing Upstream of Dam Site
42 Progression of Frazee Pool Spring Before Removal
43 Progression of Frazee Pool Fall Before Removal
44 Progression of Frazee Pool Winter During Removal
45 Progression of Frazee Pool Spring After Removal
46 Progression of Frazee Pool Summer After Removal
47 Impact of Dam Removal on Water Quality Was Measured Total Suspended Solids (TSS) Concentrations were Measured Using a Depth Integrated Sampler
48 Results of Water Quality Sampling
49 Results of Water Quality Sampling
50 Comparison of Measured TSS Values A Grab Sample Taken At Frazee (2,100 mg/l)
51 Conclusions Tools Needed Ensure Sufficient Flexibility in Permitting Rules to Treat Dam Removal as a Component of River Restoration /Management Risk-Based Site / Project Specific with an Understanding of Overall Goals Ensure Flexibility in Funding Allows Different Approaches Ensure Dam Removal Design Incorporates a Specific Strategy to Meet Specific Project Goals Include a Monitoring Component of Dam Removal - Collect and Publish More Data Regarding Dam Removal (Morphology, Short/Long Term Sediment Concentration, Fisheries, Macroinvertebrate, Water Quality, etc)
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