Yn fy llythyr ar 23 Tachwedd 2021 a ohiriodd fersiwn gynharach y TAN rhag dod i rym, gofynnais am gynnal Asesiadau Canlyniadau Llifogydd manwl i helpu i fireinio gronynogrwydd y Map Llifogydd ar gyfer Cynllunio. Rwy'n ddiolchgar bod y gwaith hwn wedi cadarnhau cywirdeb y modelu cadarn a manwl y mae'r TAN yn seiliedig arno. Cafodd y TAN gwreiddiol ei atal tra bod y gwaith hwn yn mynd rhagddo, ond mae'r penderfyniad i ddiwygio'r TAN ac ailymgynghori wedi cael effaith anochel ar ei linell amser ar gyfer dod i rym. Yn wreiddiol cafodd y TAN ei atal tan 1 Mehefin 2023 ond mae'r gwaith ailymgynghori nawr yn golygu na fydd modd cyrraedd y dyddiad hwn mwyach. O ystyried maint a chymhlethdod y dasg o ddadansoddi'r ymatebion a gwneud newidiadau pellach i'r TAN, mae'n annhebygol y bydd fersiwn newydd ohono yn dod i rym cyn diwedd eleni.
In my letter of 23 November 2021 which postponed the coming into force of the earlier version of the TAN, I requested that detailed Flood Consequences Assessments be undertaken to help refine the granularity of the Flood Map for Planning. I am grateful that this work confirmed the accuracy of the robust and detailed modelling upon which the TAN is based. The original TAN was suspended whilst this work was undertaken, however the decision to amend the TAN and re-consult has had an inevitable impact on its timeline for the coming into force. The TAN was originally suspended until 1 June 2023 but the re-consultation now means that this date will no longer be achievable. Given the size and complexity of the task in analysing the responses and making further changes to the TAN it is unlikely that the new version of the TAN will come into force before the end of this year.