Stewart, Helen

From: Mulia, Aisha

Sent: 11 October 2018 09:14

To: DEFA, Planning

Cc: 'Julia Shipley'

Subject: 18/01016/8

Attachments: Sulby_Subset_1.pdf

Dear Sir,

Please find below comments for the above application.

18/01016/B - 58 Waterloo Road Ramsey

The above application proposes the demolition and re-building of part of a domestic property that lies within the tidal flood zone as per the attached flood map. This map indicates the predicted extent of tidal flooding for a 1 in 200 year return period plus climate change.

Manx Utilities recommends that the alterations consider the possibility of raising floor levels above the 1 in 200 year plus climate change level, with an additional 600mm of freeboard for domestic properties such as this. The current extreme tidal level for Ramsey is 5.64mAD02. Therefore, it is recommended that finished floor levels for this property should be above 6.24mAD02 (5.64m + 600mm). It is also recommended that they consider introducing flood resilient measures to the property. Such measures could include ensuring that all electric points are located high up; tiling of floor coverings; cement sand render; adding salt additives to lime plaster; adding waterproof grout, installing non-return valves on any foul or surface water drains etc.

If the applicant has any questions on flood risk they can contact us at [email protected]

Kind regards,

Aisha Mulia Technical Drainage Officer

PO BOX 177 • DOUGLAS • ISLE OF MAN • IM99 1PS • BRITISH ISLES

tel: +44 (1624) 693513 • e-mail: [email protected]

mob: +44 (7624) 426874 • web: www.manxutilities.im

Please don't print this e-mail unless you really need to WARNING: If you are not the intended addressee of this e-mail, you must not copy or deliver it to anyone else or use it in any unauthorised manner.

The Flood Map indicates the extent of river flooding associated with a flood event having a 1% chance of occurring in any year (1 to 100-year event) and the extent of coastal flooding for the extreme are level having a 0.5% chance of occurring in any year (1 to 200-year event). In both cases the potential effects of climate change on flood magnduises are associated for (by assuming a 20% increase in peak river flows, and taking into consideration the predicted degree of sea level rise based on a 3700 flow tracking). The Flood Map indicates where formal flood defences and flood alleviation schemes are in place, and the cropped extents of flooding reflect the influence of flood defences on flood risk. However, defence structures may not completely remove the risk of flooding in extreme events. It should also be noted that defences can be breached or fail in extreme weather conditions, and normal defences can be overhipped by large waves. These additional risk factors are not considered in the Flood Map. The information provided is not an all resolution appropriate for localised flood risk assessments and should not be assumed as definitive at the property scale. Individual properties may, therefore, not always be at the same risk of flooding as surrounding area approaches. If you believe that a particular property has a different risk of flooding to that shown on the Flood Map and/or if you have information you believe may not have taken into account when preparing the Flood Map please contact Marie Utilities. As an event additional relevant information becomes available to Marie Utilities, the Flood Map will be improved and updated.

Marie Utilities reserve all intellectual property rights associated with the Flood Map. Marie Utilities believe that the Flood Map, and information contained therein, accords with the information currently available to it, but no representations or warranties (express or implied) are given with regard to its accuracy. To the fullest extent permitted by law Marie Utilities will not accept liability for any losses resulting in connection with the Flood Map. Unauthorised reproduction infringes copyright and may lead to prosecution or civil proceedings.

Mapping is based upon the list of Main survey map with permission of the Department of Infrastructure. © Crown Copyright Department of Infrastructure, Isle of Man.