The solution to the Bihar floods lies in growing trees on the plains and on mountain sides. This will charge the groundwaters while maintaining an automatic atmospheric distribution network for waters falling as rain on the subcontinent.
Lord Krishna says in the Gita:
Know, too from Me
Shineth the gathered glory of the suns
Which lighten all the world: from Me the moons
Draw silvery beams, and fire fierce loveliness.
I penetrate the clay, and lend all shapes
Their living force;I glide into the plant
Root, leaf and bloom
To make the woodlands green
With springing sap. Becoming vital warmth,
I glow in glad respiring frames and pass,
With outward and with inward breath
To nourish the body by all four types of food.
Again from the Gita:
From food creatures become,
From rain is the production of food,
From holistic output is rain,
Holistic output comes from work,
Work comes from the practice of the vedas,
The vedas emanate from the One Unknowable.
Therefore in the holistic output of everyone
Are the vedas forever present.
Those who disregard this wheel of life,
Are living for themselves And will be destroyed.
Applying the precautionary principle, dear friends, stop the building of dams on the subcontinent.

Production,consumption and return is the principle of perfect design. Practice safe return. Therein lies survival.
See
http://treesandmaheshwar.blogspot.com/
Reference:
http://damsquakeskosirivershifts.blogspot.com/