Page 211 - 9 teachers social book 9 @ 2077 ctp_Neat

The glaciers like Chho Rolpa, Gokyo, etc. The Kunda is the ponds like Gosai Kunda,
Surya Kunda, etc. lies in the mountainous region.
The underground water is found below the surface of the water. Underground water
is preserved in huge amount. Mostly underground water is available abundantly in
the Terai region and in the Kathmandu valley and Pokhara valley as well as in basin
and tars. People use rower pumps or hand pump to extract underground water.

Rivers are categorized into three levels on the basis of its origin, flow and utilization.
They are divided into first grade, second grade and third grade.

The First Grade Rivers

Koshi river Karnali river
The rivers which have originated from high Himalayan regions and form perennial
rivers like Koshi, Karnali and Gandaki are come under the First Grade Rivers. These
rivers are useful for hydropower generation and irrigation.

Second Grade Rivers

The rivers which have originated from the
Mahabharat range come under the Second
Grade Rivers. The volume of water get more
during the summer and in winter volume
is decreased in rivers like the Bagmati,
the Banganga, the Kamala, the Mechi, the
Kankai, the Triyuga, the Tinau, etc. These
types of rivers are very good for all types
of projects on hydropower generation and
irrigation project and drinking water supply. Mechi river

Third Grade Rivers

The rivers which are generated from the Chure range come under the category of the
Third Grade Rivers. The volume of such rivers increase during the rainy season but
very less water in winter or in dry season. The rivers such as the Tilobe, the Jamuni,

211 Dynamic Social Studies - Book IX