Lynchcombe does not have any ponds or river. The only water on the reserve runs in from Deerleap through a pipe in a dry-stone wall then in the shade of dense tree cover it is swallowed by a limestone sink hole. The water runs down into a small cave surrounded by ferns. Eventually the water returns to surface at the bottom of the hill. After heavy rain some water escapes the smallet and run down through the Combe.
This is not enough water to support a population of dragonflies. So those seen on the reserve are just passing through takIng advantage of the large numbers of insects on which they feed.
Migrant hawkers are passing through.
Darters can be seen even into to autumn on Lynchcombe.