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