(1)Yn adran 29 o Ddeddf Draenio Tir 1991 (p. 59) (effeithiau gorchmynion sy’n ei gwneud yn ofynnol glanhau ffosydd etc.), ar ôl is-adran (1) mewnosoder—
“(1A)Where, in the case of an order made under section 28 by the Agricultural Land Tribunal in relation to land in Wales, the Welsh Ministers, at any time after the end of three months or such longer period as may be specified in the order, have reasonable grounds for believing that any work specified in the order has not been carried out—
(a)the Welsh Ministers, or
(b)any person authorised by them, either generally or in a particular case,
may, in order to ascertain whether the work has been carried out, enter any land which it is necessary to enter for that purpose.”
(2)Mae’r diwygiad a wneir gan is-adran (1) yn cael effaith mewn perthynas â gorchmynion pa bryd bynnag y’u gwnaed.