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ENSC 202 – 2004Lab 1 - Introduction
Watershed Assessment (ENSC 202)
Lab 1Extracted from Vermont ANR Stream Geomorphic Assessment Protocols
Handbook - Introduction
ENSC 202 – 2004Lab 1 - Introduction
geo-morphic = land-shape
“Fluvial geomorphic science explains the physical river processes and forms that occur in different landforms and geologic and climatic settings.”
• Rivers are dynamic but predictable
• Disturbance by people affects natural physical processes
• Changes in channel form (or type) are at least partially reversible (management and restoration are is possible)
• Channel form (or type) influence erosion and flood hazard risk levels and aquatic habitat quantity and quality.
ENSC 202 – 2004Lab 1 - Introduction
What is the VT/SGA supposed to do?
• create a data collection protocol that is scientifically sound, reproducible, and comparable
• create a database system for users inside and outside the Agency of Natural Resources.
• create a robust method to support conflict resolution and promote sound land use practices and planning at the watershed scale.
• create a river assessment methodology, understandable to lay people, that informs rather just advises
ENSC 202 – 2004Lab 1 - Introduction
Dynamic Equilibrium in Streams
ENSC 202 – 2004Lab 1 - Introduction
Physical Processes & Interactions in Rivers
ENSC 202 – 2004Lab 1 - Introduction
Consequences of Land/River Management
ENSC 202 – 2004Lab 1 - Introduction
Stream Geomorphic Condition as an Assessment Tool
• In Regime – a stream reach in reference & good condition that:
– Is in expected dynamic equilibrium
– Provides sustainable, high quality aquatic and riparian habitat
• In Adjustment – a stream reach in fair condition that:
– Has change or is changing outside expected range
– Has somewhat degraded aquatic and riparian habitat
• Active Adjustment and Stream Type Departure – a stream reach in poor condition that:
– Has strong departures from the expected range, perhaps a new type
– Has clearly degraded habitat, frequently disturbed
ENSC 202 – 2004Lab 1 - Introduction
Phases of the SGA
• Phase 1 – desk top data gathering
• Phase 2 – field data gathering
• Phase 3 – field engineering survey
ENSC 202 – 2004Lab 1 - Introduction
Data Management and Quality Assurance
• Take time to learn the protocols• Regularly review your data; double
check each other• Manage your data systematically
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