River Misbourne

The River Misbourne rises in a field on the outskirts of Great Missenden, Buckinghamshire, and flows down the Misbourne valley to join the River Colne just north of where the latter is crossed by the A40 Western Avenue. The river is a 'perch' stream, flowing over a bed of impermeable material on top of a porous substrate. This state is only quasi-stable, since in periods of low rainfall the water table drops below the level of the impermeable layer. If ground works are then carried out which damage this layer, the river can sink into the porous substrate and disappear.

River Misbourne

The River Misbourne rises in a field on the outskirts of Great Missenden, Buckinghamshire, and flows down the Misbourne valley to join the River Colne just north of where the latter is crossed by the A40 Western Avenue. The river is a 'perch' stream, flowing over a bed of impermeable material on top of a porous substrate. This state is only quasi-stable, since in periods of low rainfall the water table drops below the level of the impermeable layer. If ground works are then carried out which damage this layer, the river can sink into the porous substrate and disappear.