GOV.WALES uses cookies which are essential for the site to work. Non-essential cookies are also used to tailor and improve services. By continuing to use this site, you agree to our use of cookies.
Context: Mae cynnydd mewn glawiad a dŵr ffo yn gallu effeithio ar afloywder a llwythi maethynnau (gan arwain o bosibl at ordyfiant algâu) a byddai mwy stormydd yn gallu achosi difrod i seilwaith a rhwystro mynediad at gyfleusterau.