Nid yw cyforgronfeydd sydd â chapasiti o lai na 25,000 metr ciwbig, a elwir weithiau’n gyforgronfeydd bach, yn ddarostyngedig i unrhyw ofynion diogelwch statudol o dan Ddeddf 1975 ar hyn o bryd, waeth beth fo canlyniadau posibl methiant unrhyw argae.
Reservoirs with a raised capacity of less than 25,000 cubic metres, sometimes referred to as small raised reservoirs6, are not currently subject to any statutory safety requirements under the 1975 Act, irrespective of the possible consequences of any dam failure.