Chhapra is the model of Bihar

Chhapra (Hindi: छपरा Urdu: چہَپرَ) is a city and headquarters of Saran district in the state of Bihar, India. Chhapra is also written as Chapra. It is situated near the junction of the Ghaghara River and The Ganges River. Chapra was the headquarter of district called Saran. Later on, the district was divided into three separate districts: Chapra, Siwan and Gopalganj.
Chapra grew in importance as a river mart in the 18th century when the Dutch, French, Portuguese, and English established saltpeter refineries there. It was constituted a municipality in 1864. The town has major rail and road connections with the rest of India.