Hello,

It depends on the model you are interested in. Numerical, dynamical or statistical?.

However you can lay your hands on the following for a start

http://www.fao.org/nr/water/infores_databases_cropwat.html

http://www.fao.org/nr/water/infores_databases_climwat.html

cheers

Akinsanola AA Nms

@Akinsanola

Thanks for your suggestion, but as I said i wanted to do modeling for crop water requirement of mountainous region. 

Can you please send me some literature related to above softwares..

check if this are useful.

http://booksc.org/dl/44295175/23f71f

http://booksc.org/dl/7731179/e812f8

http://booksc.org/dl/40960271/7ad950

http://booksc.org/dl/16279004/89e5aa

cheers