Building large water storage dam is long term strategy for Nepal

Amount of snow in the Himalayas are decreasing day by day thanks to the global/local warming because of this the running rivers will not carry as much water as they used to carry few decades ago

Because of dramatic altitude difference between hilly regions and southern plain given volume of water does not stays as long as it stays in India. So this will effect the refilling of underground  natural water reservoir. In few years time water level will go down and finally underground water reservoir may become empty ( we are pumping lots of underground water for agriculture and drink but their refilling process is slow because of aforementioned reason.  

 As ppl become richer, per capita use water increases, also in few decades hopefully there will tap in every house with running water so this needs lots of water say if per capita water use is 150 liter then Nepal will need 4.5 billion liter of water per day.

Then Nepal needs water for irrigation. Rice production per hectare in Nepal is almost 1/3 then that of US and other countries, same is true with wheat etc. So, in order to increase yield per hectare we need water

Say what will happen if there is a long term drought say of 5 yrs (not unlikely because it has happened in other countries. In that case many rivers will dry out; whatever rivers left will have low volume of water. And if we go for jatiya Rajya each rajya will block the water and keep it for their own use and the rajyas in low lying areas will have difficulty in quenching the thrust of its people.

To avoid this situation we need large water storage dams. Nepal needs water for drinking and irrigation purpose but underground natural reservoir is not being refilled and there is less and less snows in Himalayas.

 Third, Nepal needs water for energy production this can be done either by run off the river type of hydro power which are not efficient during winter seasons and will be useless if there is long term drought.

SO, Nepal needs to build large water storage reservoirs advantage of building these reservoirs are

1)      Water will stay in Nepali land for longer period of time; this will help refilling of localized underground water reservoir.

2)      Water will be available  for irrigation purpose and drinking water supply during the drought too

3)      Electricity production

4)      Reservoir type of hydroelectric station can be used in full capacity so that we will not run out of power during the winter and also during the drought

5)      Nepal will also be able to provide enough drinking water to its people and irrigation

6)      Selling of electricity to generate revenue

If Nepal does not do this and  trend of Global/local warming continues Nepal will not have enough water during winter time in 2-3 decades and during summer also within 5 decades ( my guestimation depending upon the decrees in snows in Himalayas and water volume in different rives during summer and increase in population in due course of time)

 So, once again Nepal needs to build water storage reservoir in different parts of Nepal other wise we will start fighting with each other in few decades time, this time for water.

 But there are some disadvanges of building high dams

 In case the dam collapses because of earthquake low lying areas will be flooded and many ppl will die. This can be avoided by building dams which can withstand up 9 Richter scale earthquakes (technologies available) and we can also avoid high population density in probable flood area. Lots of buildings in Japan withstand the earthquake; it was the tsunami which was devastating.

 Nepal is gifted by the nature, lots of rives flow between the high hills we just have to built the dam in one side that will help store the water between high hills. Off course we can not do that if the hills are sandy. But there are enough hard rock hills in Nepal.