Page 17 - Hillingdon SuDS DESIGN & EVALUATION
P. 17

Trees and plants are at risk               Overview
         Limited pipe capacity,                                         of drought, due to lack of
           as well as blockage,                                         rainwater.
                can cause local
                       flooding






























                                                                                                                   12




         ‘Flashy’ flows can
          cause erosion of
             watercourses

                                                                                                Pollution can be
                                                                                                washed into
                                                                                                streams, rivers
                                                                                                and the sea.
                                                             Recharge of                        Hydrocarbons and
       Quick conveyance of                             groundwater and                          tyre crumb are
     rainwater from site can                       aquifers is prevented,                       examples.
         increase the risk of                         and ‘baseflows’ to
         flooding elsewhere.                      watercourses are lost.





      Conventional drainage results in high rates and
      increased amounts of runoff reaching streams
      and rivers.  Pollution from urban surfaces is also
      washed into watercourses.


      London Borough of Hillingdon SuDS D & E Guide                                                  © 2018 McCloy Consulting & Robert Bray Associates
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