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Watershed Planning within a Quantitative Scenario Analysis Framework

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Published on: July 24, 2016

Evaluating the Illinois Stream Valley segment model as an effective management tool.

Stephen S Warrner¹, Robert U Fischer, Ann M Holtrop

¹Department of Biological Sciences, Eastern Illinois University, Charleston, IL 61920, USA.

Environmental Management

|September 24, 2010

Summary

The valley segment model effectively divides watersheds into distinct stream segments for sampling. Habitat within these segments is more consistent than between different segments, validating its use in stream management.

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Area of Science:

Ecology
Hydrology
Geographic Information Systems (GIS)

Background:

Stream habitat assessments are crucial for evaluating biological potential, anthropogenic impacts, and guiding restoration.
Current methods for selecting representative stream reaches can lack consistency and objectivity.
The valley segment model, based on GIS parameters, aims to create homogeneous stream segments for sampling.

Purpose of the Study:

To determine if stream habitat within a valley segment is homogeneous.
To assess if different valley segments exhibit varying habitat characteristics.
To validate the valley segment model as a tool for stream management and sampling.

Main Methods:

Randomly selected two abutting valley segments within 13 streams in the Embarras River watershed.
Quantified stream channel habitat characteristics using a transect method on 100-meter reaches.
Employed Principal Components Analysis (PCA) and Multivariate Analysis of Variance (MANOVA) to analyze habitat variability.

Main Results:

The majority of abutting valley segments showed significant differences in habitat variables.
Habitat variability within valley segments was less than the variability observed between different valley segments.
PCA and MANOVA confirmed significant environmental variation between adjacent valley segments.

Conclusions:

The valley segment model is an effective tool for identifying representative stream sampling locations.
This model allows for reliable extrapolation of reach-specific information for management purposes.
The findings support the use of GIS-derived valley segments in ecological and hydrological studies.