Not exactly Jharkhand's fault here!
Incessant rain over Dhanbad and surrounding districts have filled both Maithon & Panchet Dams up to the brim! Water levels had breached the danger mark, hence water had to be subsequently released!
And BTW, situation is Jharkhand is far more grim, half of CIC section is under water now, both DHN & GMO CCU were under water for an entire day due to non-stop raining !