Flood Management - Attenuation Basin, Earthworks and Drainage
Case study
Flood Management - Attenuation Basin, Earthworks and Drainage
Flood management attenuation basin, earthworks and drainage works at Howden
Scope
Lying alongside the Paternoster Drain on the
outskirts of Howden, the new build residential scheme off Station Road incorporates a green play area doubling as an attenuation basin for the temporary storage of surface rain water.
Sweeting Bros Ltd were contracted to undertake
comprehensive earthworks to form the attenuation basin and also to install associated drainage measures within the confines of the new build residential environment.
Five concrete headwall outfalls with handrails were
also installed together with 128m of filter drain forming the drainage design along the length of the basin design along with a 3.5m wide maintenance access track from the residential road.
A pedestrian footpath running alongside
Paternoster Drain was diverted for the duration of
the works to facilitate the installation of a large 2.4m diameter penstock manhole discharging into the live Paternoster Drain.
On completion of the works, reinstatement works
comprised topsoil replacement with amenity type grass seed incorporated to protect the bund, slopes
Key Aspects
and basin bottom.
Earthworks
Preliminary topsoil stripping and storage was
undertaken prior to profiling the subsoil. The removal of an existing redundant culvert was carried out. Subsequently a 60m bund running parallel with Paternoster Drain was formed with further profiling to form the attenuation basin sides.
Grading and laser levelling was also undertaken in
the basin bottom. Earth Bund Formation
Penstock Manhole discharging
into Paternoster Drain
Graded slopes and levelled basin
for attenuation 128 m Filter Drain
Manholes of varying sizes
Removal of redundant existing
culvert 3.5m wide maintenance access track
Plan View
Project Images
Challenges
Moving machinery from one property to another
Footpath Diversion often requires biosecurity and environmental
protocols to minimise transfer of contaminants or Works often entail footpath restrictions and/or road invasive species such as black grass. closures / diversions to protect or segregate the Working with Water public. It was necessary to obtain all licensing and permissions from the relevant authorities, whilst Working in or around water poses hazards for maintaining good relationships with residents employees arising from the natural environment.
The presence of vermin and exposure to
already living in the development. Communication leptospirosis twinned with the possibility of of any anticipated inconvenience was undertaken drowning, all add to the normal risks involving at the earliest opportunity as part of the project accidents concerning machinery and moving parts. programming.
Works taking place in live watercourses also pose
Health & Safety problems arising from adverse weather and
increased rainfall. It was necessary to monitor and
All workings were carried out compliantly under
adjust programmes to accommodate and minimise
CDM 2015 protocols requiring Construction Phase
risks. Pumping out of accumulating / rising ground
Plans together with comprehensive assessment of
water is often necessary to ensure safe working all risks and method statements to minimise risks conditions. for all work elements.
Cooperation
Sweeting Bros Ltd are unique in that we have
invested in mountain rescue sleds and equipment As with any large project where multiple contractors to facilitate patient evacuation in the event of an or works are taking place, co-operation is key factor accident. Our work is often in secluded, in success. Sweeting Bros Ltd are adept at inaccessible areas with very poor ground managing multi-agency stakeholders. conditions.
Biosecurity
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