Udayapur District in the context of Sunsari District

Hydrogeology (hydro- meaning water, and -geology meaning the study of the Earth) is the area of geology that deals with the distribution and movement of groundwater in the soil and rocks of the Earth's crust (commonly in aquifers). The terms groundwater hydrology, geohydrology, and hydrogeology are often used interchangeably, though hydrogeology is the most commonly used.

Hydrogeology is the study of the laws governing the movement of subterranean water, the mechanical, chemical, and thermal interaction of this water with the porous solid, and the transport of energy, chemical constituents, and particulate matter by flow (Domenico and Schwartz, 1998).

Triveni is a town in Katari Municipality, Udayapur District, in the Sagarmatha Zone of south-eastern Nepal. The formerly Triveni village development committee was merged to form a new municipality in May 2014. At the time of the 1991 Nepal census, Triveni had a population of 6,015 people, living in 1,105 individual households.