Lerras på gården Ila i Lier.

Abstract

In November 1935 the ground on the left hand beach of the Lier stream fell down. The place is situated a hundred meters downstreams a bridge near Lier station on the railway to Drammen. 70 years previously a slide occurred at this very place. Since then the stream had eroded a steep wall, 4-5 m high, in the old slided masses, while a several m deep pool had been formed under the wall. Owing to this unstable formation the new falling occurred. The surface of the old slide sloped 19 m between the edge of the slide and the stream's water level. The distance is 40 m. This makes nearly an inclination of 1:2. It is of some interest to note that the new slide rests with a slighter slope, 1:3,5.