Use of a multi-disciplinary approach to adjust an abstraction regime for the protection of shad Nicola Teague & Tom Elmitt IFM Fish and Flows Specialist Conference 2019 - York
Background to the project
Project structure Steering group Flow of information and decision making Hydraulic Ecology impact Licencing T&F modelling and T&F group group Bathymetry T&F group General process of work
Purpose of the abstraction Part of the Tywi regulation scheme – Llyn • Insert Brianne is ~ 64,000 Ml reservoir in the headwaters. Water is released from the dam at a rate of 200 Ml/d and runs down the river for picture of >40 miles. Brianne Nantgaredig Raw Water Pumping station • abstracts up to 200 Ml/d a day from the Tywi to the Lower Lliw It is subsequently reabstracted from the Lower • Lliw for treatment at Felindre WTW, which is the largest WTW in Wales. From Felindre it supplies areas across South • Wales, from Carmarthen in the West to Cardiff in the East.
Asset limitations Fixed speed high lift pumps • • Minimal variability in low lift pumps Small bankside storage • Lliw storage must be preserved for resilience • High lift pumps can only run two at a time • Felindre demand must be met at all times •
Project outcomes Ended up agreeing on conditions which satisfied both sides • • Beyond reasonable scientific doubt that there is no adverse impact • Licence is workable for DCWW and NRW • Licence required no additional infrastructure for compliance
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