Water Engineering

Yes, it is good.
In NIT Silchar, M.Tech in water resource engineering is a Post Graduate programme which has wide scope in water management, resources, etc.

Please refer to the link provided below for a list of colleges which offer M.Tech agriculture and related courses. You can download their brochure and check if distance courses are offered by the institute:
https://www.shiksha.com/engineering/colleges/m-tech-agriculture-farm-engineering-colleges-india

I am the one who choose Masters in civil engineering with the specialization of water engineering, so in my view, water engineering is the most important subject of civil engineering after structural engineering, everyday world is busy to save water for future , so the value of a water engineers increase every day, hence go for it.

must clear class 10+2 or equivalent with PCM. To get admission in B.Tech/B.E in water resource Technology one must clear IITJEEfor entry into IIt or entry into NITs and other government as well as private institutes