Hydrometry. Sedimentation. Measurements required for effective sediment management and control at river structures
Hydrometry. Sedimentation. Measurements required for effective sediment management and control at river structures
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1 Scope This document provides guidance on the collation of the measurements required for the management of sedimentation at river structures. These include structures used by water supply utilities, other major water abstractors, HEP producers, bridges, and for flow measurement by environmental protection agencies. It is intended to be used at sites where the sediment ranges in particle size from fine colloidal material to coarse gravel, that is, sediment normally transported by flood flows. It is not intended for use at sites where major channel bed regrading is to be undertaken requiring the major excavation of solid bed material. The document is also intended for use when a redundant structure is being removed, or when modifications to a structure are being made to facilitate fish migration or for river restoration. This is to ensure that the impacts of these changes are adequately monitored and recorded. The document covers the provision of routine measurements, and the checks and requirements that are to be made by the operator so that specific basic information is collated and made readily available. This information is used to inform decision-making by environment management agencies that authorize flushing, sediment clearance or sedimentation removal. This is to ensure minimal environmental impacts, and to support compliance with existing environmental legislation.
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