Mae llawer iawn o waith wedi’i wneud i wella diogelwch ein cronfeydd dŵr ers adolygiad Pitt. Mae mapiau llifogydd bellach wedi’u cwblhau sy’n dangos effaith waethaf bosibl methiant argae ar y dalgylch. Lluniwyd map o’r fath ar gyfer pob cronfa ddŵr yng Nghymru a Lloegr sydd wedi’i chofrestru o dan Ddeddf 1975, at ddibenion cynllunio brys. Nid yw’r mapiau yn dangos, fodd bynnag, pa mor debygol yw llifogydd o ddigwydd yn sgil y cronfeydd dŵr.
Since the Pitt review, much work has been done to improve our reservoir safety.  Reservoir inundation maps for every reservoir in England and Wales registered under the 1975 Act has now been completed.  These inundation maps which indicate the “worst realistic case” effect of a dam breach on the downstream catchment have been prepared for emergency planning purposes and show the consequences of reservoir flooding, however, they do not show the likelihood of reservoir flooding occurring.