During these periods, we look to sweep the roads, including a system of cleansing in areas of particular dense tree cover, but it is often difficult for us to attend sites to clear the gullies.
Yn ystod y cyfnod hwn, rydym yn ysgubo’r ffyrdd, gan gynnwys system o don lanhau mewn lleoedd dan gysgod llawer o goed, ond mae'n anodd i ni gyrraedd y safleoedd er mwyn clirio’r tyllau draen.