Ecological & Protected Species Consultants based In Cardiff

Bat Mitigation in WWII Bunker, Gloucester

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A survey by DCE Ltd found that an underground building dating from World War II was used as a summer roost by small numbers of lesser horseshoe bat (LHB), on a site which was proposed for housing developments.  As part of the mitigation for the development, the underground structure was retained enhanced to increase its attractiveness for use by bats (especially lesser horseshoe bats) and to this end a series of modifications were designed by DCE Ltd. Several internal walls were constructed inside the building under licence, together with various ‘baffles’, to create as wide a variation in microclimatic conditions as possible, varying from very cold to warm. A series of parallel corridors was created, with baffle walls at various points either at ceiling level (to retain warm air) or at floor level (to restrict the movement of cold air), or in some cases both. These walls were created from rough-mortared, lightweight insulation blocks, with frequent small gaps and occasional vent blocks. A grill to prevent unauthorised access was fitted to the front entrance of the structure. In addition to the internal walls and baffles, the walls and ceiling of the entrance antechamber and cold zones elsewhere were fitted with untreated wooden slats with rough wooden boards attached for use by roosting myotid bats. These boards were hinged and latched to allow easy inspection. The structure is now known to be used by a small but growing population of lesser horseshoe bats, and occasional greater horseshoe bats have also been recorded.

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