Halcrow Modelling Dredging Assessment
TECHNICAL MEMORANDUM Somerset Levels & Moors appraisal package Project: Somerset Levels & Moors – Modelling/Appraisal Axe, Brue, Parrett & Tone Dredging Assessment Client: Environment Agency PREPARED FOR: Project team COPY TO: Project team PREPARED BY: J Ratsey, D Debski, PS Rayner, S Hedgecott DATE: 5 November; revised 1 December; finalised 8/11 December 2014 12 January 2015 PROJECT NUMBER: 651407 Memorandum on Dredging Assessment for Brue, Axe, Parrett and Tone Project area Contents 1. Introduction 2. Background data 3. About dredging Assessment 4. Hydraulic assessment area 5. Cost assessment 6. Environmental assessment 7. Dredging assessment: River Parrett, Thorney to Langport 8. Dredging assessment: River Parrett, Langport to Tone confluence 9. Dredging assessment: River Parrett, North Moor to Bridgwater 10. Dredging assessment: River Tone, Ham to Hook Bridge 11. Dredging assessment: Environment Agency flood map River Yeo, Huish Episcopi PS to confluence 12. Dredging assessment: Assessment areas Penzoy: New Southlake inlet to Axe/Brue Kings Sedgemoor Drain 13. Dredging assessment: River Axe, Clewer to New Cut 14. Dredging assessment: Cheddar Yeo, Froglands to Axe confluence 15. Dredging assessment: Brue – Panborough Drain 16. Dredging assessment: Glastonbury Millstream Parrett/Tone 17. Options Matrix: A. Cost assessment B. Hydraulics assessment C. Environmental assessment SOMERSET LEVELS & MOORS APPRAISAL PACKAGE 1 Review of the effectiveness of further dredging – Axe, Brue, Parrett & Tone 1. Introduction This memo presents the initial assessment of dredging options for the sites listed below on the Axe, Brue, Parrett and Tone river catchments (see Figures 1.1 and 1.2). The findings provide an evidence base and options matrix for use by the Environment Agency in deciding the effectiveness and prioritisation of further dredging.
[Show full text]