an all-India significance because of its tropical location, its shape as well as function like a funnel. It funnels not only the tropical monsoon current from the Bay to the subtropical parts of north-west India, but also acts as a gateway between the developed industrial belts of West Bengal and the hinterlands in Odisha, Jharkhand, Madhya Pradesh and Uttar Pradesh. Climate Using the Köppen classification, Purulia has a tropical savanna climate (Aw) and receives most of its rainfall during the monsoon season. Temperature is high in summer, averaging and average in winter, around . Rainfall defines the climate of the district. South west monsoon is the principal source of rainfall in the district. Average annual rainfall varies between . The relative humidity is high in monsoon season, being 75% to 85%. But in hot summer it comes down to 20% to 35%. Rivers and lakes Several rivers flow across Purulia district. Among these Kangsabati, Kumari, Silabati (silai), Dwarakeswar, Subarnarekha and Damodar are the important ones. Although several rivers flows across the district, 50% of the water run off due to the undulated topography. There are also several Small dams like Futiyary, Murguma, Pardi, Burda, Gopalpur, which are mainly used for irrigation of agriculture field. Saheb Bandh is one of the popular and famous waterbodies of Purulia. It is located in the heart of the purulia town. It is a shelter of the migratory birds which comes from Bangladesh, Burma, Sindh, Baluchistan during December to March. Geology Due to undulated topography nearly 50% of the rainfall flows away as runoff. The district is covered by mostly residual soil formed by weathering of bed rocks. Economy The economy of the Purulia district is mainly driven by the industrial & Agricultural sector and tourism. Among these, the industrial sector is the backbone of the economy of the district. From 2001, with the new industrial policies of government of West Bengal, this district has attracted investments in steel, cement and power sectors. The district has large scale industries like Santaldih Thermal Power Station at Santaldih, Pumped Storage Project at Baghmundi, ACC Damodar Cement Factory at Madhukunda. The Purulia Pumped Storage Project of West Bengal State Electricity Distribution Company Ltd. consists of 4 units with a capacity of 224 MW each, which generates 900 MW of electricity. DVC is involved with a thermal power plant in Raghunathpur sub division with a capacity of 2400 MW.