Consider the following pairs: How many pairs given above ate not correctly matched? 

Only one pair is correctly matched. Pair 1 is incorrectly matched. The Ghataprabha Reservoir is located in the Belgavi district of the state of Karnataka. The reservoir has storage of about 659 million cubic meters, providing irrigation to a total extent of 1,396,000 hectares of land. The Ghataprabha River is a major tributary of the River Krishna. Pair 2 is correctly matched. The Gandhi Sagar Dam is one of the four major dams built on India’s Chambal River and is located in the Mandsaur & Neemuch district of Madhya Pradesh. It is a masonry gravity dam. Pair 3 is incorrectly matched. The Indira Sagar Dam on Narmada river is a multipurpose project, located at Narmada Nagar, Punasa in the Khandwa district of Madhya Pradesh. Indirasagar Polavaram, an interstate project on river Godavari has been conceived as a part of recommendations of Godavari Water Disputes Tribunal (GWDT). The project implements Godavari-Krishna link under Interlinking of rivers project. Indira Sagar (Polavaram) project is located on river Godavari near Ramayyapet village of Polavaram Mandal of West Godavari district in Andhra Pradesh. Pair 4 is incorrectly matched. Maithon, dam is located on the banks of river Barakar. The Maithon Dam is located about 48 kms from the Coal City of Dhanbad, Jharkhand . The dam with an underground power station is one of its kinds in the whole of South East Asia. The lake on which it is built is spread over 65 square kilometers. This was developed by the Damodar Valley Corporation (DVC Ltd) .