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The Experimental Drainage Maintenance Programme (EDM) 1997-2001
Summary Report and Recommendations
Central Fisheries Board
A
report commissioned by the Office of Public Works (Drainage Division)
and prepared by the Central Fisheries Board
December, 2001.
TABLE OF CONTENTS
Preface
1. OVERVIEW OF WORK PROGRAMME 1997-2001
1.1. Problem
Identification and Study Site selection
1.2. Topics – Maintenance problems
1.3. Survey programme
1.4. Inspection of channels
2. OVERVIEW OF FINDINGS FROM THE PROGRAMME
2.1. Maintenance
impacts on fish and habitat
2.2. Maintenance impacts on Aquatic plants
2.3. Feasibility of experimental options
2.3.1. Introduction of hydraulic diversity
2.3.2. Management of lateral deposits by ‘topping’
2.3.3. Loosening of the gravel bed
2.3.4. Bank Protection
2.4. On-going investigations
2.4.1. Studies on water celery
2.4.2. Studies on tree cover
3. MANAGEMENT IMPLICATIONS: IMPLEMENTATION OF PROGRAMME FINDINGS
3.1. Manning,
conveyance and habitat
3.2. Modified maintenance practices since
1945 Arterial Drainage Act
3.3. Current practice that could be ‘evolved’
to benefit the river corridor
3.3.1. Management of bankslope area
3.3.2. ‘Minimalist’ maintenance
3.3.3. Restorative maintenance
3.3.4. Habitat retention
