U. Shakya, A study on subsidence problem in Kusma area, Parbat district

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A study on subsidence problem in Kusma area, Parbat district

U. Shakya

ITECO Nepal (P) Ltd.

Jour. Nep. Geol. Soc., Vol. 9, 1993, 1-7

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ABSTRACT

The Kusma terrace is about 250 m high above the Kaligandaki River bed. It is composed of highly cemented conglomerate of unsorted suhangular to rounded pebble to boulder si7ed rock fragments of mctasandstone, limestone, quartzite, gneiss and phyllite. Owing to calcareous cementing matrix conglomerate is maturely karstified with formation of promi nent features of tower karst, pinnacles, solution chimneys and fissures. Solution channels are filled up by slope wash deposit of recent age. The subsurface flow through these channels scours the unconsolidated slope wash deposit and ultimately cause land subsidence and sink holes.