{"id":33857,"date":"2019-08-23T15:19:58","date_gmt":"2019-08-23T15:19:58","guid":{"rendered":"https:\/\/ygc.cymru\/project\/borth-y-gest-flood-alleviation-scheme"},"modified":"2023-08-22T13:36:46","modified_gmt":"2023-08-22T13:36:46","slug":"borth-y-gest-flood-alleviation-scheme","status":"publish","type":"project","link":"https:\/\/ygc.cymru\/cy\/project\/borth-y-gest-flood-alleviation-scheme","title":{"rendered":"Cynllun Atal Llifogydd Borth Y Gest"},"content":{"rendered":"

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Cynllun Atal Llifogydd Borth Y Gest<\/strong><\/h3>\n

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Cleient:<\/strong><\/td>\n\u00a0Llywodraeth Cymru \/ Cyngor Gwynedd<\/strong><\/td>\n<\/tr>\n
Contractwr:<\/strong><\/td>\n\u00a0K&C Group<\/strong><\/td>\n<\/tr>\n
Gwerth y Cynllun:<\/strong><\/td>\n\u00a0\u00a3250,000<\/strong><\/td>\n<\/tr>\n
Dyddiad Cwblhau:<\/strong><\/td>\n\u00a0Hydref 2018<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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[\/et_pb_image][et_pb_image src=”https:\/\/ygc.cymru\/wp-content\/uploads\/2019\/08\/borth-y-gest-final-wall.jpg” admin_label=”image 3″ _builder_version=”4.17.3″ z_index_tablet=”500″ box_shadow_horizontal_tablet=”0px” box_shadow_vertical_tablet=”0px” box_shadow_blur_tablet=”40px” box_shadow_spread_tablet=”0px” use_border_color=”off” border_color=”#ffffff” border_width=”2px” border_style=”solid” animation=”left” sticky=”off” always_center_on_mobile=”on” global_colors_info=”{}”]<\/p>\n

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Mae Borth y Gest yn gymuned arfordirol fechan ger Porthmadog, Gwynedd. Mae’r pentref yn gyrchfan boblogaidd i dwristiaid yn ystod misoedd yr haf, ac mae nifer fawr o bobl hefyd yn defnyddio Llwybr yr Arfordir sy’n dilyn trywydd y bae. Yn ystod blynyddoedd diweddar mae Borth y Gest wedi dioddef nifer o lifogydd. Y rheswm oedd bod y m\u00f4r wedi mynd dros y llwybr troed ac wedi llifo ar hyd y briffordd ac i mewn i eiddo preswyl a masnachol.<\/h5>\n
Yn ystod camau cychwynnol y prosiect cynhaliwyd Adroddiad Gwerthuso Prosiect ar gyfer y pentref. Roedd hwn yn cynnwys adnabod ffynhonnell a llwybr y llif, datblygu opsiynau posib, peryglon, costau a chreu model hydrolig o’r bae.<\/h5>\n
Cynhaliwyd ymgysylltiad cyhoeddus gyda thrigolion lleol, cynghorwyr lleol, Cyfoeth Naturiol Cymru a Chyngor Gwynedd.<\/h5>\n
Gwnaed modelu gorlifo tonnau a hydrolig er mwyn hysbysu uchder dyluniad y clawdd newydd. Byddai’r amddiffynfa ar \u00f4l ei hadeiladu yn gallu gwrthsefyll (hyd at ac yn cynnwys) digwyddiad sy’n 1 mewn 100 mlynedd. Roedd dyluniad y cloddiau yn golygu pe byddai angen codi eu huchder mewn blynyddoedd i ddod yn unol \u00e2 rhagdybiaethau newid hinsawdd a chynnydd yn lefel y m\u00f4r, y byddai’r sylfeini’n gallu dygymod \u00e2 hyn. Gan fod bae Borth y Gest yn SoDdGA, cynhwyswyd asesiadau amgylcheddol manwl a dulliau gweithio llym (gan gynnwys y caniatadau a’r trwyddedau perthnasol) fel rhan o’r gwaith.<\/h5>\n
Yn rhan o’r cynllun mae morglawdd newydd ~170m, sy’n ehangu’r prif glawdd presennol yng nghanol y bae i amgylchynu bae Borth y Gest. Dyluniodd YGC y morglawdd i gysylltu \u00e2’r brif wal sydd wedi bodoli yn y bae ers y 1880au. Dyluniwyd y morglawdd newydd i allu gwrthsefyll pwysedd hydrostatig o’r m\u00f4r a symudiad y tonnau.<\/h5>\n
Adeiladwyd y muriau o goncrid wedi’i atgyfnerthu wedi’i orchuddio mewn llechi lleol (o Flaenau Ffestiniog). Castiwyd y muriau yn y fan a’r lle drwy ddefnyddio ffurfwaith penodol i bob rhan o’r mur.\u00a0 Roedd dwy lifddor yn y mur hefyd ger y llithrfa a’r fynedfa i gerddwyr. Ar hyd y wal mae nifer o dyllau draenio gyda falfiau di-ddychwel drwy’r wal i alluogi i unrhyw dd\u0175r wyneb lifo ymaith.<\/h5>\n
Un o elfennau allweddol dyluniad y mur oedd sicrhau ei fod yn cydweddu \u00e2’r ardal leol a’i fod yn asio gyda’r mur presennol. Llwyddwyd i wneud hyn drwy orchuddio’r wal \u00e2 llechi lleol. Yn y dyluniad cafwyd nodweddion ychwanegol, gan gynnwys dwy fainc wedi’u gosod yn y mur, a thri phlac gwybodaeth o lechen.<\/h5>\n
Mewn cyfuniad \u00e2’r estyniadau i’r wal i amddiffyn rhag llifogydd llanwol, gosodwyd gi\u00e2t di-ddychwel yng nghilfach cwrs d\u0175r Afon Llety. Diben hyn oedd amddiffyn y pentref rhag d\u0175r llanwol a allai lifo i fyny’r cwlfert a pheri perygl llifogydd.<\/h5>\n
\u00a0<\/h5>\n

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Cynllun Atal Llifogydd Borth Y Gest Cleient: \u00a0Llywodraeth Cymru \/ Cyngor Gwynedd Contractwr: \u00a0K&C Group Gwerth y Cynllun: \u00a0\u00a3250,000 Dyddiad Cwblhau: \u00a0Hydref 2018 Mae Borth y Gest yn gymuned arfordirol fechan ger Porthmadog, Gwynedd. Mae’r pentref yn gyrchfan boblogaidd i dwristiaid yn ystod misoedd yr haf, ac mae nifer fawr o bobl hefyd yn defnyddio […]<\/p>\n","protected":false},"author":1,"featured_media":33849,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"

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Borth Y Gest - Flood Alleviation Scheme<\/h3>

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Client:<\/td>\u00a0Welsh Government\u00a0<\/td><\/tr>
Contractor:<\/td>\u00a0K&C<\/td><\/tr>
Project Cost:<\/td>\u00a0\u00a3250,000<\/td><\/tr>
Completion Date:<\/td>\u00a0October 2018<\/td><\/tr><\/tbody><\/table>

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\u00a0<\/p>

Gwybodaeth Prosiect<\/h3>

Priffyrdd<\/strong>\u00a0\u00a0<\/strong>Bwriad y Cynllun Gwella ar yr A470 o Faes yr Helmau i'r Cross Foxes oedd lledu\u2019r ffordd a gwella diogelwch ar ran gul o\u2019r brif gefnffordd hon oedd \u00e2 throeon cyfyng a gwelededd cyfyngedig ac nad oedd arni unrhyw ymylon ffordd.Fel rhan o\u2019u r\u00f4l i gynnal Asesiad Effaith Amgylchedd (AEA) o\u2019r cynllun prif gefnffordd hwn, comisiynodd YGC Arolwg Cynefinoedd Cam 1 o goridor y cynllun yn 2002. Bu i\u2019r asesiad adnabod coedwigoedd oedd yn cynnwys cynefin addas ar gyfer y pathew Muscardinus avellanarius<\/em>, sy'n Rhywogaeth Gwarchodedig Ewropeaidd. Arweiniodd hyn at gynnal arolygon yn 2003 a datgelodd rhain bod tair cneuen gyll yn arddangos arwyddion nodedig eu bod yn cael eu hagor gan bathew - un ohonynt yn oedolyn - ym mhen gogledd-orllewinol coridor y cynllun, felly cadarnhawyd bod y goedwig hon ble daethpwyd o hyd i\u2019r dystiolaeth yn gynefin byw i\u2019r pathew. \u00a0\u00a0Yn 2004, cynhaliwyd arolwg ehangach yn yr ardal hon ac o'i chwmpas, a chofnodwyd hen nyth pathew fel rhan o'r gwaith.Gan y byddai cynefin oedd yn cefnogi poblogaeth fyw o bathewod yn cael ei golli yn sgil y cynllun, roedd angen Trwydded Rhywogaethau Gwarchodedig Ewropeaidd, ynghyd \u00e2 mesurau lliniaru a gwneud iawn helaeth. Heb fesurau lliniaru, gallai\u2019r cynllun arwain at farwolaeth pathewod a cholli safleoedd nythu a chynefin bwydo. Roedd angen i unrhyw gamau lliniaru ystyried bioleg y pathew, sy'n famolyn coedol, gan ei fod yn byw yng nghanopi\u2019r coed a\u2019r llwyni yn ystod misoedd yr haf ac yna\u2019n gaeafgysgu yn y ddaear dros y gaeaf.\u00a0 Cynigwyd y camau lliniaru a ganlyn:<\/p>