Dam Removal Notes.docx

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Department
Earth & Environmental Sciences
Course
EESC 1158
Professor
Donald James
Semester
Fall

Description
What is stream restoration? Definition: The process of assisting the recovery of an ecosystem that has been degraded, damaged, or destroyed. Scope: Quick fixes on short sections of rivers (100 m) to large projects (10s of km) Business: >$1 billion per year What are we restoring to and how? Steps: 1. Determine pre-disturbance reference conditions 2. Set goals, forecast effects, and monitor results Goals and actions 1. Aesthetics/recreation/education: e.g., trash removal 2. Bank stabilization: e.g., re-vegetation, bank grading 3. Channel reconfiguration: Alteration of channel plan form or longitudinal profile. Includes stream meander restoration and in-channel structures that alter the flow of the stream. Goals andActions 1. Fish passage: Remove barriers such as dams, install fish ladders. Or place migration barriers at strategic locations along streams to prevent undesirable species from accessing upstream areas. 2. Floodplain reconnection: Practices that increase the flood frequency of floodplain areas or that promote exchanges of organisms and materials between riverine and floodplain areas. (e.g., bank or channel reshaping) 3. Flow modification: Practices that alter the timing and quantity of water delivery (e.g., Glen Canyon Dam) 4. In-stream habitat improvement:Altering structural complexity to increase habitat availability and diversity for target organisms, to provide breeding habitat and refugia from disturbance and predation (e.g., add boulders, woody debris) 5. In-stream habitat improvement:Altering structural complexity to increase habitat availability and diversity for target organisms, to provide breeding habitat and refugia from disturbance and predation (e.g., add boulders, woody debris) 6. Riparian management: Re-vegetation and/or removal of exotic species (e.g., weeds and cattle) 7. Water quality management: Change the chemical composition and/or suspended particulate load. Remediation of acid mine drainage falls into this category. Why remove dams? 1. Public safety – Dams are aging
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