Cymraeg: Fideo dros amser o gored yn cael ei osod. Mae coredau fel hyn yn helpu efo amddiffyn rhag llifogydd gan fod nhw'n rhoi'r gallu i ni addasu'r lefelau dwr yn dibynnu ar y sefyllfa, er enghraifft mewn cyfnod a glaw trwm.
English: Time elapse video of a new tilting weir being installed in the Gwent levels. Weirs like this one play a vital role in flood defence as they allow us to adjust water levels to suit certain situations, for example, during periods of heavy rain.
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