The piedmont zone having width of 3 -10 km lies on the foot of Siwalik hills with elevation ranging from 320 to 500 m above msl. This zone is constituted by sediments brought by the turbulent rivers emerging from the hills. The piedmont zone has moderate slopes with 10m to more than 30m thick deposits of colluvial and alluvial sediments. It serves as a good recharge zone but cannot hold ground water due to steep hydraulic gradient.

The intermontane valley exists along river Sirsa extending to a length of 17.5 km. with a width ranging from 2.5 to 7.5 km. The valley is characterised by unconsolidated clastic sediments, derived from the adjacent hills. Intermontane valley has very good ground water prospects as it is being recharged by the surrounding hills as well as by the river water.
Table-1 General Geological Succession at Panchkula District

Group	System	Series	Description of rock types
Recent		Newer Alluvium	Fluviatile unconsolidated sands, silts & clays of flood plain deposits.
Quaternary	Upper Pleistocene	Older alluvium	Fluviatile deposits poorly sorted consist of silts, sands, gravels, clays with variable proportion of kankar.
	---------------------------unconformity----------------------
	Lower Pleistocene	Upper Siwalik	Boulder conglomerate, coarse sands, grits and some clays.
Tertiary	Upper Pliocene		Pinjore Stage: Coarse grit, sandstone and conglomerate.
	Middle Pliocene		Tatrot Stages: Soft sand stones, clays and some conglomerate.
	Lower Pliocene	Lower Siwalik	Dhok Pathan Stage: Brown sandstone, gravel beds, orange clay and shales.
	Upper Miocene		Nargi Stage: Hard and grey sandstone and subordinate shales.
	---------------------------unconformity----------------------
	Eocene	Subathu	Grey & red shale with occasional sandstone and limestone beds

Structural Origin
The structural hills representing the geomorphic landforms of structural origin cover an area of 185.80 sq. km. Structural hills are constituted by massive sandstones, shale and limestones having prominent joints and fractures. The hills trend NW-SE attaining an altitude of over 500m above msl. These have slope towards southwest with an average gradient of 28 m/km. The structural hills have poor to nil ground water prospects because most of rain water which falls over them goes down-slope as surface run-off.





Fig. 1: Hydrogeomorphological interpretation

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