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Bryngwyn Water Treatment Works Bryngwyn Water Treatment Works (WTW) is situated on high ground just South of Llandeilo, the Works is used to produce drinking (potable) water for West Glamorgan, from raw water which is piped by gravity from Usk Reservoir. When Usk is empty, water can be abstracted by electric pumps from the Towy nearby. In 1992, Dwr Cymru installed an underground water storage reservoir which involved digging a huge hole - and at the same created massive silting problems down the little Nant Cib - already suffering from long term silting from Bryngwyn's persistent wash-water discharges, only then recently resolved.
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