{"id":8889,"date":"2022-01-12T10:36:17","date_gmt":"2022-01-12T10:36:17","guid":{"rendered":"https:\/\/afonyddcymru.org\/gorlifoedd-storm-cyfun-csos\/"},"modified":"2025-08-12T10:26:17","modified_gmt":"2025-08-12T09:26:17","slug":"gorlifoedd-storm-cyfun-csos","status":"publish","type":"post","link":"https:\/\/afonyddcymru.org\/cy\/gorlifoedd-storm-cyfun-csos\/","title":{"rendered":"Gorlifoedd Storm Cyfun (CSOs)"},"content":{"rendered":"

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Mae dros 2,000 o orlifoedd storm wedi’u caniat\u00e1u yng Nghymru. Maent yn cyflawni swyddogaeth iechyd cyhoeddus hanfodol, gan reoli’r mewnbwn ychwanegol i weithfeydd trin d\u0175r gwastraff mewn cyfnodau o dywydd eithafol<\/strong>.<\/p>\n

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Yn \u00f4l y gyfraith, rhaid i gwmn\u00efau d\u0175r sicrhau bod gorlifoedd storm ond yn gollwng d\u0175r yn ystod cyfnodau o law trwm, pan fydd capasiti’r system garthffosiaeth gyfun wedi ei drechu oherwydd glaw a\/neu eira’n toddi. O dan yr amodau hyn, bydd y d\u0175r a gaiff ei ollwng wedi\u2019i wanhau a dylai effaith y llwyth bacteriol ar y cwrs d\u0175r sy’n ei dderbyn fod yn fach iawn. Er y gallant gyflwyno llygryddion eraill, nid yw gorlifoedd storm yn gyfrannwr sylweddol at lefelau maetholion yn y rhan fwyaf o afonydd Cymru.<\/p>\n

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Mae gorlifoedd storm yng Nghymru yn cael eu rheoleiddio gan Cyfoeth Naturiol Cymru (CNC), y corff sy’n pennu\u2019r amodau trwydded y mae\u2019n rhaid cydymffurfio \u00e2 hwy. Mae nifer y gollyngiadau a ganiateir o orlif yn dibynnu ar sensitifrwydd amgylcheddol y cwrs d\u0175r y gwneir y gollyngiad iddo.<\/p>\n

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Mae gan D\u0175r Cymru fap ar eu gwefan sy’n dangos gwybodaeth amser real am orlifoedd storm. Noder mai dim ond gorlifoedd sy’n gysylltiedig \u00e2 dyfroedd ymdrochi y mae hwn yn eu dangos \u2013 nid yw’n dangos holl orlifoedd storm D\u0175r Cymru.<\/p>\n

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Tasglu Gwella Ansawdd Afonydd Cymru<\/h3>\n

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Yn 2021, sefydlwyd \u201cTasglu Gwella Ansawdd Afonydd Cymru\u201d Llywodraeth Cymru i wella rheolaeth a rheoleiddio amgylcheddol gorlifoedd yng Nghymru. Mae Afonydd Cymru wedi gweithredu fel ymgynghorwyr annibynnol i\u2019r Tasglu hwn. O ganlyniad i waith y Tasglu, mae dros 99% o orlifoedd storm D\u0175r Cymru bellach yn cael eu monitro (100% o rai Hafren Dyfrdwy), gan gofnodi nifer a hyd y gollyngiadau. Cyhoeddir y data hwn (data Monitro Hyd Digwyddiadau neu EDM) ar eu gwefan ac adroddir arno i Gyfoeth Naturiol Cymru.<\/p>\n

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Sicrhaodd y Tasglu hefyd ddiffiniad o law eithriadol y gellir ei ddefnyddio i reoleiddio gorlifoedd carthffosiaeth yng Nghymru yn ei erbyn. O ganlyniad, mae trwyddedau ar orlifoedd carthffosiaeth bellach yn orfodol yn gyfreithiol am y tro cyntaf<\/p>\n

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Mae D\u0175r Cymru hefyd yn buddsoddi’n sylweddol i wella gorlifoedd storm (\u00a3140m 2020-2025 a \u00a3420m pellach wedi’i gynllunio ar gyfer 2025 -2030) gan ganolbwyntio yn gyntaf ar orlifoedd sy’n achosi’r niwed amgylcheddol mwyaf.<\/p>\n

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Er hyn, mae problemau’n parhau i effeithio ar afonydd Cymru a gorlifoedd storm. Datgelodd ymchwiliadau annibynnol yn 2023 dorri amodau trwyddedau hirdymor mewn rhai safleoedd, nifer fawr yr oedd Cyfoeth Naturiol Cymru yn gwbl ymwybodol ohonynt. Bu i Afonydd Cymru, trwy gydweithio gyda Peter Hammond, herio\u2019r diffyg prosesau rheoleiddio a oedd yn caniat\u00e1u’r gollyngiadau hyn. Yn 2023, sicrhawyd canllawiau diwygiedig i gwmn\u00efau d\u0175r yng Nghymru i gydymffurfiaeth \u00e2 gofynion llif llawn i\u2019r gwaith trin. Rydym hefyd wedi galw am gryfhau pellach yn y system gynllunio i atal datblygiadau newydd rhag cael eu caniat\u00e1u lle nad yw gorlifoedd carthffosiaeth yn cael eu gweithredu\u2019n unol \u00e2 thrwydded nac yn cydymffurfio \u00e2\u2019r gwaith trin.<\/p>\n

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Hefyd, yn 2023, cafodd perfformiad amgylcheddol D\u0175r Cymru ei israddio gan CNC o dair i ddwy seren oherwydd:<\/p>\n

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