Hafan ‘y’ Mor Haven Holiday Park

  • Client:

    Bourne Leisure

  • Project:

    Hafan ‘y’ Mor Haven Holiday Park

  • Location:

     Pwllheli L

 

Background

AGA were approached by Bourne Leisure to carry out the restoration of the Boating Lake at Hafan ‘Y’ Mor Holiday Park, Pwllheli, North Wales. The client asked AGA to conserve the heritage and ecology of the area and this was taken into account when planning the management options. AGA initially made a site visit to survey the silt and access and haulage routes as well as the silt disposal options available. The opportunity to identify
hazards, accessibility and potential impacts of the work on the local environment were also considered.

soft landscaping & Hard Landscaping At The National Football Centre

A lot of relevant information was collected which was used to minimise and mitigate negative impacts on the ecology, historic and cultural value of the waterbody when writing the methodology for the work. The surrounding habitat was identified to have low ecological value, but the agreed works minimised disturbance, nonetheless; and the restored lake most certainly enhanced biodiversity AGA specifically advised the client on a number of aspects of the removal and ‘muck away’ options for the organic silt arisings. Following this advice, it was decided that the silt would be removed to a field which was laid to pasture a distance of 400m from the lakeside.

The de-siltation was carried out by a 360 excavator working from within the lake and a long reach excavator working from the side. The silt was loaded into tonne dump trucks to be taken for de-watering and bunding on the field. Once the de-siltation was complete but prior to it being refilled a mooring jetty was
constructed which was used to moor boats and for users to embark and disembark safely.

Trees in new cemetery area

The Work

The original lake’s ecology did not have the benefit of aquatic plants as the ‘hard’ landscaped banks, which were constructed from cast concrete or block work. AGA suggested to the client that it would be very beneficial to soften the banks by installing a planted margin. Plants form the foundation and base of all ecological systems and the aquatic environment is no exception. Because all of the perimeter banks are concrete, and the banks of the soil
islands were vertical it was not possible to use potted plants.

AGA profiled the soil banks of the islands to reduce the vertical bank angle to a workable slope. The coir rolls also had the benefit of protecting the toe of the soil bank from future erosion. Installing pre-vegetated coir rolls along the banks established a robust planted margin to the islands, which will have significant benefits to biodiversity and a positive impact on balancing water quality. A further thirty five meters of bank were treated with ‘rip-rap’ rock armouring, this was not in this specific instance used to protect the bank from erosion but to shield from view a section of low bank. A sheet of Firestone EPDM membrane was installed underneath the rip rap to form an impermeable barrier.

AGA offered this solution to the client to increase this low area of bank to allow the same amount of ‘freeboard’ as found along the rest of the perimeter bank.The original lake’s ecology did not have the benefit of aquatic plants as the ‘hard’ landscaped banks, which were constructed from cast concrete or block work. AGA suggested to the client that it would be very beneficial to soften the banks by installing a planted margin. Plants form the foundation and base of all ecological systems and the aquatic environment is no exception. Because all of the perimeter banks are concrete, and the banks of the soil islands were vertical it was not possible to use potted plants. AGA profiled the soil banks of the islands to reduce the vertical bank angle to a workable slope. The coir rolls also had the benefit of protecting the toe of the soil bank from future erosion.

Installing pre-vegetated coir rolls along the banks established a robust planted margin to the islands, which will have significant benefits to biodiversity and a positive impact on balancing water quality. A further thirty five meters of bank were treated with ‘rip-rap’ rock armouring, this was not in this specific instance used to protect the bank from erosion but to shield from view a section of low bank. A sheet of Firestone EPDM membrane was installed underneath the rip rap to form an impermeable barrier. AGA offered this solution to the client to increase this low area of bank to allow the same amount of ‘freeboard’ as found along the rest of the perimeter bank.

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