Page 26 - Lincolnshire SuDS DESIGN & EVALUATION
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6.0 Local SuDS requirements for
Local SuDS requirements
Lincolnshire
Landscape character The thinnest soils tend to occur over chalk
and limestone escarpments and on valley
40% of Lincolnshire comprises flat low lying
fenland areas and can present some side, with the deepest soils in the Fenlands.
particular challenges to assessing SuDS Local SuDS specific requirements
requirements. These include:
Local SuDS Specific Requirements
■ High groundwater table and low soil
infiltration rates; The developer should consider all sources of
flood risk both to and from the proposed
■ Pervious paving may require special development, and good sustainable drainage
consideration to attenuate flows and allow solutions, as an integrated design approach.
for slow infiltration; Lincolnshire County Council, as highway &
■ Flat ground levels resulting in shallow flow lead local flood authority (HFA), will then
provide a combined response in line with its
gradients and shallow depths of pipes and
underground structures to achieve a statutory duties.
gravity outfall; The distribution and layout of buildings and
infrastructure on site can greatly influence
21 ■ Taking account of typical IDB pump
discharge rates of 1.4l/s/Ha. the potential for creating flood pathways and
affect flood risk to property. A number of
Local Geology hierarchical key stages and steps should be
taken to reflect the principles and strategic
Lincolnshire contains a wide variety of soils objectives of the development, and establish
including alluvium (clay, silt and sand) along appropriate infrastructure prior to
coastal regions, Till (Diamicton), River Terrace proceeding to the outline and detailed design
deposits (Sand and Gravel), blown sand, peat, stages (refer to - Lincolnshire Development
glacial sand and gravel. The type of soil and Roads and Sustainable Drainage Design
underlying geology influence the likelihood of Approach).
surface and groundwater flooding in an area.
Early consideration of infrastructure
Lincolnshire soils vary in thickness from a few requirements is essential, and close
centimetres to over a metre in response to discussion with potential adopting authorities
the underlying geology, location in the is necessary to guide integrated planning,
landscape and agricultural practices.
and ensure effective ongoing maintenance
arrangements.
Lincolnshire County Council SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates
