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Variation of Condition 2 (approved plans) attached to Planning Consent NP5/72/250B dated 24/03/2023 o change the vegetated bagwork open channel solution downstream of the flow measurement structure to a buried concrete culvert,

Llyn Celyn Reservoir, Frongoch. LL23 7NU

All consultations completeReference: NP5/72/250KEryri National Park

Last published check: 30 Sept 2026, 05:25. Check the council record for more recent changes.

Application location

Llyn Celyn Reservoir, Frongoch. LL23 7NU

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Application summary

Status
All consultations complete
Application type
Variation of a condition
Received
8 Jul 2025
Validated
Not published
Determination deadline
1 Sept 2025
Local authority
Eryri National Park

Application overview

Variation of Condition 2 (approved plans) attached to Planning Consent NP5/72/250B dated 24/03/2023 o change the vegetated bagwork open channel solution downstream of the flow measurement structure to a buried concrete culvert,

Proposal details

Reference
NP5/72/250K
Alternative references
PP-14156232
Ward
Llanuwchllyn ED, Llandderfel ED
Parish
Llanycil, Llandderfel
Agent
Mrs. Jenny Coxon
UPRN
AP0CEP89C685HB30WM

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Documents 12 of 12

DocumentPublishedAction
ApplicationFormRedacted.pdf8 Jul 2025View
B15100-123532-12-ZZ-DR-CA-PN9009_P07_Planning_Application_Site_Boundary.pdf8 Jul 2025View
B15100-123532-12-ZZ-DR-CA-PN9063_P04.pdf8 Jul 2025View
B15100-123532-12-ZZ-DR-CA-PN9086_P03_Site_Location_Plan.pdf8 Jul 2025View
B15100-123532-12-ZZ-DR-CA-PN9088_P03.pdf8 Jul 2025View
B15100-123532-12-ZZ-DR-CA-PN9101_P02.pdf8 Jul 2025View
B15100_123632_12_XX_RP_NA_EI0393_P01_Llyn_Celyn_Green_Infrastructure_Statement.pdf8 Jul 2025View
Covering_Letter._Ref_4963-CAU-XX-XX-CO-T-9115.A0-C1.pdf23 Jul 2025View
S - Ecoleg / Ecology 05.08.2528 Aug 2025View
S - CNC / NRW 17.09.2517 Sept 2025View
S - CNC / NRW 05.08.2517 Sept 2025View
Rh.P7 Oct 2025View

Documents open on the council website. Browse council documents if a link has changed.

Application timeline

Council milestones and published deadlines. A deadline passing does not confirm a decision.

  1. Received date

    Published milestoneCouncil source

  2. Registration date

    Published milestoneCouncil source

  3. Consultation expiry date

    Past published deadline

    A published target or deadline. It does not confirm an outcome.

    Council source

  4. Statutory expiry date

    Past published deadline

    A published target or deadline. It does not confirm an outcome.

    Council source

  5. Decision due date

    Past published deadline

    A published target or deadline. It does not confirm an outcome.

    Council source

  6. Dispatch date

    Published milestoneCouncil source

  7. Decision date

    Published milestoneCouncil source

  8. Extension date

    Past published deadline

    A published target or deadline. It does not confirm an outcome.

    Council source

  9. Decision expiry date

    Published deadline

    A published target or deadline. It does not confirm an outcome.

    Council source

Decision & conditions

Permitted with conditions
Planning conditions
  1. The development hereby permitted shall be commenced before the expiration of FIVE years from the date of the original planning permission, reference no. NP5/72/250B, dated 24/03/2023.
  2. Rhaid cychwyn y datblygiad a ganiateir drwy hyn cyn diwedd PUM mlynedd o ddyddiad y caniatâd cynllunio gwreiddiol, rhif cyfeirnod NP5/72/250B, dyddiedig 24/03/2023.
  3. The development hereby permitted shall be carried out in accordance with the following approved plans: Planning Application Site Boundary B15100-123532-12-ZZ-DR-CA-PN9009 – Rev P07 Site Location Plan B15100-123532-12-ZZ-DR-CA-PN9086 Proposed Site Plan -Tumble Bay (Sheet 1 of 3) B15100-123532-12-ZZ-DR-CA-PN9088 P03 Site General Arrangement B15100-123532-12-ZZ-DR-CA-PN9061 Hesgyn Catchwater and Flow Measurement Structure Ref B15100-123532-12-ZZ-DR-CA-PN9101 P02. Auxiliary Spillway – Cross Sections (Sheet 1 of 3) Ref B B15100-123532-12-ZZ-DR-CA-PN9063 P03; Ref B15100-123532-12-ZZ-DR-CA-PN9063 P04; Timber Post Stock Proof Fencing – Standard Detail B15100-123532-12-ZZ-DR-CA-PN9102 Chain Single Leaf Field Gate – Standard Detail B15100-123532-12-ZZ-DR-CA- Soakaway Detail B15100-123532-12-ZZ-DR-NA-PN9114 Clawdd Typical Cross Section B15100-123532-12-ZZ-DR-NA-PN9115 Pollution Prevention Plan Site Compound Setup B15100-123532-12-ZZ-DR-CA-SE9105 Pollution Prevention Plan Site Wide Area B15100-123532-12-ZZ-DR-CA-SE9106 Public Visuals B15100-102365-12-ZZ-DR-LA-PN9107 Basic Whole Site Layout Welsh Water Public Engagement B15100-123532-12-ZZ-DR-KE-GA9050 Tumble Bay GA B15100-123532-12-ZZ-DR-CA-PN9088 Culvert GA B15100-123532-12-ZZ-DR-CA-PN9089 Outlet GA B15100-123532-12-ZZ-DR-CA-PN9090 Centre alignment Long section B15100-123532-12-ZZ-DR-CA-PN9072 Tumble Bay Sections B15100-123532-12-ZZ-DR-CA-PN9063 Culvert Sections B15100-123532-12-ZZ-DR-CA-PN9066 Outlet sections B15100-123532-12-ZZ-DR-CA-PN9069 Enabling Works Plan B15100-123532-12-ZZ-DR-CA-PN9008 Access improvements Works B15100-123532-12-ZZ-DR-CA-PN9076 Enabling Works – Site Compound – Plan View B15100-123532-12-ZZ-DR-CA-PN9075 Landscape and Visual – Considerations Plan B15100-102365-12-ZZ-DR-NA-PN9091 Landscape and Visual – Landscape Plan B15100-102365-12-ZZ-DR-NA-PN9092 Landscape and Visual – Landscape Sections B15100-102365-12-ZZ-DR-NA-PN9094 Wider Area Planting Plan B15100-123532-12-ZZ-DR-NA-PN9116 Detailed Planting Plan B15100-123532-12-ZZ-DR-NA-PN9117 Site Waste Management Plan (SWMP) B15100-123532-12-XX-RP-NA-EI0211 Material Management Plan (MMP) (incl Soil Management Plan SMP) B15103-123532-12-XX-RP-NB-EI0166 Construction Traffic Management Plan (CTMP) B15100-123532-12-XX-RP-CE-CJ0198 Flood Consequence Assessment (FCA) B15100-123532-12-XX-RP-NA-EI0187 submitted to the Local Planning Authority and contained in the form of application and in any other documents accompanying such application unless condition(s) to amend them is/are included on this planning decision notice
  4. Mae'n rhaid cyflawni'r datblygiad a ganiateir yma yn unol â'r cynlluniau a gymeradwywyd isod: Planning Application Site Boundary B15100-123532-12-ZZ-DR-CA-PN9009 – Rev P07 Site Location Plan B15100-123532-12-ZZ-DR-CA-PN9086 Proposed Site Plan -Tumble Bay (Sheet 1 of 3) B15100-123532-12-ZZ-DR-CA-PN9088 P03 Site General Arrangement B15100-123532-12-ZZ-DR-CA-PN9061 Hesgyn Catchwater and Flow Measurement Structure Ref B15100-123532-12-ZZ-DR-CA-PN9101 P02. Auxiliary Spillway – Cross Sections (Sheet 1 of 3) Ref B B15100-123532-12-ZZ-DR-CA-PN9063 P03; Ref B15100-123532-12-ZZ-DR-CA-PN9063 P04; Timber Post Stock Proof Fencing – Standard Detail B15100-123532-12-ZZ-DR-CA-PN9102 Chain Single Leaf Field Gate – Standard Detail B15100-123532-12-ZZ-DR-CA- Soakaway Detail B15100-123532-12-ZZ-DR-NA-PN9114 Clawdd Typical Cross Section B15100-123532-12-ZZ-DR-NA-PN9115 Pollution Prevention Plan Site Compound Setup B15100-123532-12-ZZ-DR-CA-SE9105 Pollution Prevention Plan Site Wide Area B15100-123532-12-ZZ-DR-CA-SE9106 Public Visuals B15100-102365-12-ZZ-DR-LA-PN9107 Basic Whole Site Layout Welsh Water Public Engagement B15100-123532-12-ZZ-DR-KE-GA9050 Tumble Bay GA B15100-123532-12-ZZ-DR-CA-PN9088 Culvert GA B15100-123532-12-ZZ-DR-CA-PN9089 Outlet GA B15100-123532-12-ZZ-DR-CA-PN9090 Centre alignment Long section B15100-123532-12-ZZ-DR-CA-PN9072 Tumble Bay Sections B15100-123532-12-ZZ-DR-CA-PN9063 Culvert Sections B15100-123532-12-ZZ-DR-CA-PN9066 Outlet sections B15100-123532-12-ZZ-DR-CA-PN9069 Enabling Works Plan B15100-123532-12-ZZ-DR-CA-PN9008 Access improvements Works B15100-123532-12-ZZ-DR-CA-PN9076 Enabling Works – Site Compound – Plan View B15100-123532-12-ZZ-DR-CA-PN9075 Landscape and Visual – Considerations Plan B15100-102365-12-ZZ-DR-NA-PN9091 Landscape and Visual – Landscape Plan B15100-102365-12-ZZ-DR-NA-PN9092 Landscape and Visual – Landscape Sections B15100-102365-12-ZZ-DR-NA-PN9094 Wider Area Planting Plan B15100-123532-12-ZZ-DR-NA-PN9116 Detailed Planting Plan B15100-123532-12-ZZ-DR-NA-PN9117 Site Waste Management Plan (SWMP) B15100-123532-12-XX-RP-NA-EI0211 Material Management Plan (MMP) (incl Soil Management Plan SMP) B15103-123532-12-XX-RP-NB-EI0166 Construction Traffic Management Plan (CTMP) B15100-123532-12-XX-RP-CE-CJ0198 Flood Consequence Assessment (FCA) B15100-123532-12-XX-RP-NA-EI0187 submitted to the Local Planning Authority and contained in the form of application and in any other documents accompanying such application unless condition(s) to amend them is/are included on this planning decision notice
  5. The development shall be carried out in accordance with 'Llyn Celyn Section 10 MITIOS Works Construction Environmental Management Plan February 2023' as approved under application reference NP5/72/250D, dated 02/04/2023.
  6. The development shall be carried out in accordance with 'Plan Llyn Celyn Section 10 MITIOS Works Landscape and Environmental Management Plan,' dated April 2023, by Mott MacDonald (Document Reference No. B15100-123532-12-XX-RP-NB-EI0204, Revision P02)', as approved under application reference NP5/72/250E, dated 19/05/2023.
  7. BBuilding operations in stone shall be carried out in accordance with the approved sample, as approved under applciation reference NP5/72/250H, dated 16/02/2025.
  8. The core working hours for general construction shall be limited to between 0700 and 1800 Monday to Friday, 0700 and 1300 Saturday, and no working on a Sunday or Bank Holidays, unless otherwise approved by the Local Planning Authority.
  9. 7The development shall be carried out and all archaeological work completed in strict accordance with 'WRITTEN SCHEME OF INVESTIGATION FOR AN ARCHAEOLOGICAL WATCHING BRIEF AT Llyn Celyn Reservoir, Gwynedd, February 2023 ' as approved under application reference NP5/72/250D, dated 02/04/2023.
  10. A detailed report on the archaeological work required by condition 7 shall be submitted to and approved by means of a formal application to the Local Planning Authority within 6 months of completion of archaeological fieldwork and approved by the Local Planning Authority.
  11. Rhaid cyflawni'r datblygiad yn unol â'Chynllun Rheoli Amgylcheddol Gwaith Adeiladu MITIOS Adran 1' Llyn Celyn Chwefror 2023' , fel y'i cymeradwywyd o dan gyfeirnod cais NP5/72/250D, dyddiedig 02/04/2023.
  12. Rhaid cyflawni'r datblygiad yn unol â 'Chynllun Llyn Celyn Adran 10 Cynllun Rheoli Tirwedd ac Amgylcheddol MITIOS, 'dyddiedig Ebrill 2023, gan Mott MacDonald (Cyfeirnod Dogfen Rhif B15100-123532-12-XX-RP-NB-EI0204, Diwygiad P02)', fel y'i cymeradwywyd o dan gyfeirnod cais NP5/72/250E, dyddiedig 19/05/2023.
  13. Rhaid cynnal gweithrediadau adeiladu mewn carreg yn unol â'r sampl gymeradwy, fel y'i cymeradwywyd o dan gyfeirnod y cais NP5/72/250H, dyddiedig 16/02/2025.
  14. Bydd yr oriau gwaith craidd ar gyfer adeiladu cyffredinol yn gyfyngedig i rhwng 0700 a 1800 o ddydd Llun i ddydd Gwener, 0700 a 1300 ddydd Sadwrn, a dim gweithio ar ddydd Sul na Gwyliau Banc, oni bai bod yr Awdurdod Cynllunio Lleol wedi cymeradwyo fel arall.
  15. Rhaid cyflawni'r datblygiad a chwblhau'r holl waith archaeolegol yn unol yn llym 'CHYNLLUN YMCHWILIAD YSGIFENEDIG AR GYFER BRIF GWYLIO ARCHEOLEGOL YN Gronfa Dd"{r Llyn Celyn, Gwynedd, Chwefror 2023' fel y'i cymeradwywyd o dan gyfeirnod cais NP5/72/250D, dyddiedig 02/04/2023.
  16. Rhaid cyflwyno adroddiad manwl ar y gwaith archaeolegol sy'n ofynnol gan amod 7 i'r Awdurdod Cynllunio Lleol a'i gymeradwyo drwy gais ffurfiol iddo o fewn 6 mis i gwblhau'r gwaith maes archaeolegol a'i gymeradwyo gan yr Awdurdod Cynllunio Lleol.
  17. To Comply with Section 91 (as amended) of the Town and Country Planning Act 1990.
  18. I gydymffurfio a Rhan 91 (fel y diwygiwyd) o'r Ddeddf Gynllunio Gwlad a Thref 1990.
  19. To define the permission and for the avoidance of doubt.
  20. Er mwyn diffinio’r caniatâd ac i osgoi amheuaeth.
  21. 3For the avoidance of doubt and in order to protect the biodiversity, the environment of the area and the visual impact on the wider landscape in accordance with Eryri Local Development Plan Policies 2016-2031 and in particular policies 1 and A.
  22. TFor the avoidance of doubt and in order to protect the biodiversity, the environment of the area and the visual impact on the wider landscape in accordance with Eryri Local Development Plan Policies 2016-2031 and in particular policies 1 and A.
  23. 5To ensure a satisfactory standard of appearance of the development and the use of appropriate local building materials, in accordance with Eryri Local Development Plan Policies 2016-2031 and in particular policies 1, 6 and A.
  24. To minimise the loss of amenity to nearby properties and the surrounding area in general in accordance with Eryri Local Development Plan Policies and in particular Policy 1.
  25. To ensure the implementation of an appropriate programme of archaeological mitigation in accordance with the requirements of Planning Policy Wales 2021 and TAN24: The Historic Environment
  26. To ensure that the work will comply with MOPPHE/Management of Archaeological Projects (MAP 2) and the Standards Guidance of the Chartered Institute of Archaeologists (CifA).
  27. Er mwyn osgoi amheuaeth ac er mwyn diogelu bioamrywiaeth, amgylchedd yr ardal a'r effaith weledol ar y dirwedd ehangach yn unol â Pholisïau Cynllun Datblygu Lleol Eryri 2016-2031 ac yn benodol polisïau 1 ac A.
  28. Er mwyn osgoi amheuaeth ac er mwyn diogelu bioamrywiaeth, amgylchedd yr ardal a'r effaith weledol ar y dirwedd ehangach yn unol â Pholisïau Cynllun Datblygu Lleol Eryri 2016-2031 ac yn benodol polisïau 1 ac A.
  29. Er mwyn sicrhau safon foddhaol o ran ymddangosiad y datblygiad a defnyddio deunyddiau adeiladu lleol priodol, yn unol â Pholisïau Cynllun Datblygu Lleol Eryri 2016-2031 ac yn benodol polisïau 1, 6 ac A.
  30. I leihau colli amwynder i eiddo cyfagos a'r ardal gyfagos yn gyffredinol yn unol â Pholisïau Cynllun Datblygu Lleol Eryri ac yn benodol Polisi 1.
  31. I sicrhau bod rhaglen briodol o liniaru archaeolegol yn cael ei gweithredu yn unol â gofynion Polisi Cynllunio Cymru 2021 a TAN24: Yr Amgylchedd Hanesyddol.
  32. Rhaid cyflwyno adroddiad manwl ar y gwaith archaeolegol sy'n ofynnol gan amod 7 i'r Awdurdod Cynllunio Lleol a'i gymeradwyo drwy gais ffurfiol iddo o fewn 6 mis i gwblhau'r gwaith maes archaeolegol a'i gymeradwyo gan yr Awdurdod Cynllunio Lleol.
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