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  • About us
    • History
    • Our Founder
    • Our Warden
    • Who's Who
    • Habitat creation >
      • Grazing
      • Predator Balance
    • Wildlife >
      • Birds
      • Plants
      • Mammals
      • Invertebrates
  • Home
  • Visiting
    • Walking
    • Wildlife Viewing
    • Car Parking
    • How to find us
    • Download a Map
  • Nature Retreats
  • Events and Activities
    • Guided Walks 2025
    • Family Open Weekend
    • Book a Guided Tour
  • Make a Gift
    • Donate
    • Leave a legacy
    • Become a Supporter
  • Find Out More
    • Outdoor Learning >
      • Schools
      • Home Education Groups
      • Youth Groups
    • Warden's Blog
    • Volunteer
    • Wildlife Recording >
      • Bird census
      • Moth census
      • Bird and Wildlife Reports
      • Aerial Surveys
      • Kingfishers Bridge Publications
    • Projects >
      • Classroom Regeneration
      • New HIdes
      • Mound Observation Deck
  • Contact us
  • Staff Portal

Warden's blog

Lime Well

20/11/2016

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Picture
Picture
​Over the summer we dug a test pit into the limestone to check ground water availability for filling the wildlife ponds.  It is also a possible support option for keeping wetland water bodies topped up with water through the Spring when other sources may be limited.  The natural coralline limestone is just 15cm below the topsoil and is very porous, with winter water tables being drawn up close to the surface even at the top of the site.  However, about 2m below the surface there is a very hard layer of impermeable limestone which we were unable to break through despite a 20 ton digger.  Summer water levels dropped below this but are rapidly rising again with the change in weather, so the ‘well’ is of some use for the original purpose.  
Picture
Picture
​Having installed a vertical 2m long pipe into the well, we back filled with gravel to ensure good flow of water from the surrounding limestone and refilled.  The well will be a good indicator of groundwater levels for the site as well as providing an emergency water source when needed.  As part of larger projects on the site we will be looking at the practicality of much deeper (20-30m deep) boreholes in the limestone to tap into deep aquafers to supplement our need for reliable water volumes.
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    James Moss

    Reserves Manager at the Kingfishers Bridge wetland creation project in Cambridgeshire.

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