increasing population of kathmandu valley

kathmandu has been over populated nowadays.20 percentage of the total population lives in the kathmandu valley.people from the 75 district came here to have the settlement for living permanently in search of the betterment.according to the 2058 census there was only population of 20 lakh people living in nepal. but the population has increased to about 70 lakh till 2067. from this we can imagine hoe fast the population is increasing in kathmandu valley which is also the capital of the nepal. due to the over population kathmandu valley is facing different problems like water problem,electricity problem and so on. the building are also been building in a rapid way due to the over population.