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  • Home
  • About us
    • History
    • Our Founder
    • Who's Who
    • Habitat creation >
      • Grazing
      • Predator Balance
    • Wildife >
      • Birds
      • Plants
      • Mammals
      • Invertebrates
  • Visiting
    • Walking
    • Wildlife Viewing
    • Car Parking
    • How to find us
    • Download a Map
  • Events and Activities
    • Family Open Weekend
    • Holiday Activities
    • Book a Guided Tour
  • Outdoor Learning
    • Schools
    • Home Education Groups
    • Youth Groups
  • Make a Gift
    • Donate
    • Leave a legacy
    • Become a Supporter
  • Find Out More
    • 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
  • Shop
    • Branded Cloithing
    • Mugs and Coasters
    • Educational Packs and Equipment
    • Forget Me Not Apiary
    • Events Tickets
  • Staff Portal
    • Event Contact Details

Warden's blog

HLS Underway!

18/12/2012

1 Comment

 
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Bat Cave drainage.
The bat cave sits in a trench dug into the solid limestone, this provides perfect conditions for a bat hibernaculum, however it also sits bellow the winter water table on the site.  I previous years this has been kept low by pumping the water out, however with the extreemly wet conditions this summer and autumn the pumps have failed to keep up with the flooding. At times the cave has been full of water from floor to ceiling, obviously disasterous for sleeping bats.

This drainage pipe laid underground from the floor of the bat cave down to the lower level ditch system should constantly and reliably drain the cave throughout the year.

The only problem is that the cave floor is about 4 meters bellow ground level, and the limestone is surprisingly hard!

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Sand Martin Cliffs.
The Sand Martin Cliffs here at Kingfishers Bridge have been a hugh success in tha past, however over years the face has gradually crumbled away through frost action and resulted in the vertical face becoming a slope.  This allows predators such as stoats to get into the Sand martin holes.   The Sandstone also retains moisture much more than the sand banks normally used by the martins.  This year no Sand martins nested here for the first time since the project started

By removing the topsoil and laying a plastic membrane that slopes gently away from the face of the cliff, water runs back through the soil and not over the face keeping the face drier, this should minimise the frost action and also create better conditions for Sand martins to nest.   The face then needs to be re-cut to vertical, easier said than done in limestone!

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1 Comment
Dating in Vaughan link
8/10/2013 11:29:27 pm

Great information and site

Reply



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    James Moss

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

    Picture

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