Nepal has high potentiality for producing hydroelectricity however difficult to produce it. Give reasons for each.

Nepal has high potentiality for producing hydroelectricity because Nepal is second richest country in hydroelectric power where water flows continuously throughout the year. It is also the mountainous country and provides water continuously to the rivers. But it is difficult to produce because of lack of manpower as well as money. 

Himalayan Rivers contain large quantities of sediment with hard abrasive particles, which is a hurdle for the economic exploitation of hydro power resources. Erosion of the earth's surface takes place because of influence of climatic, tectonic and human activities.

Hydropower can impact water quality and flow. Hydropower plants can cause low dissolved oxygen levels in the water, a problem that is harmful to riparian (riverbank) habitats and is addressed using various aeration techniques, which oxygenate the water.

Almost all the power plants in the Himalayan region are affected by excessive sediment in rivers that reduce the life of plants either by filling reservoirs or by erosion of turbine components. The design and operation of headwork components in hydropower plants can only manipulate sediment particle size and hence only sediment concentration in the water. The erosion of hydraulic machinery depends on eroding particles, that is, their size, shape and hardness; on substrates, their chemistry, elastic properties, surface hardness and surface morphology; and on operating conditions, velocity, impingement angle and concentration. The shape, size and mineral content of sediment vary at different locations of the same river system depending on distance traversed by particles, gradient of the river and the geological formation of the river course and catchment areas.