Critical Drainage Area reviews

Critical Drainage Area reviews

Critical drainage areas can cover wide areas within both rural and urban environments: villages towns (such this example from Barnstaple in North Nevon) cities (for example London has many including much of Chelsea) They are where man made drainage infrastrure has been identified as at critical risk of failure, resulting in flooding. Such areas can be completely different or similar, to the areas identified by the Environment Agency as at risk of natural watercourse, river and sea flooding.   So how is a Critical Drainage Area...

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Code for sustainable homes – hydrology reports towards sur1 and sur2

Code for sustainable homes – hydrology reports towards sur1 and sur2

All new social housing schemes in England must have a Code for Sustainable Homes (CSH) rating. While many local authorities in England are requiring the Code for Sustainable Homes to be met as a condition of the planning for private housing schemes. We assist Clients, Architects and others involved in projects to identify or design sustainable drainage and flood risk mitigation works and advise on compliance and performance against the categories Sur 1 (Surface Water Run-off) and Sur 2 (Flood Risk). The Code for Sustainable Homes...

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Gatwick Airport Radar Tower avoids Christmas 2013 River Mole Flood

Gatwick Airport Radar Tower avoids Christmas 2013 River Mole Flood

The floods at Gatwick Airport around Christmas 2013 in relation to the River Mole caused considerable disruption when an electrical substation flooded. Such disruption to key infrastructure is completely unnecessary if competent Civil Engineering Consultants are employed to assess sites and produce appropriate flood mitigation solutions.  At Wilsham Consulting our Engineers have experience of flood mitigation design for a wide range of clients, from domestic sites to key infrastructure. A good example of this is the NATS Gatwick Airport...

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Basement construction and groundwater in London advice

Basement construction and groundwater in London advice

Basement construction in London has been a common for the last 300 years. However, the recent escalation in land prices and conservation restrictions regarding works above ground, have increase the desire to install new larger basements. Such large basements are becoming more common, especially around Hampstead, Notting Hill and Chelsea. A central document for consideration in the design of basements is BS8102 – The Code of practice for protection of below ground structures against water from the ground BS8102 covers...

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French drain – design advice

French drain – design advice

A French drain is essentially a trench which is designed and constructed with free draining granular material. French drains have often not been designed or constructed correctly in the past, which has resulted in the UK having a considerable legacy of flooding claims. The Association of British Insurers claim records show that a failure in such localised soakaway measures, such as French drains – is the most common flooding related claim in the UK! The following equation provides a useful starting point for...

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Water Sensitive Urban Design

Water Sensitive Urban Design

Water Sensitive Urban Design (WSUD) is a term used to describe an engineering led approach to planning and designing towns and cities using an integrated and sustainable approaches to water management. It looks at the water cycle as a whole and how urban environments can best be developed to bring about healthy ecosystems by integrating the whole water cycle. Water Sensitive Urban Design is a land planning and engineering design approach which integrates: surfacewater groundwater wastewater or sewerage and clean water...

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