Jhelum is a few miles upstream from the site of the ancient Battle of the Hydaspes between the armies of Alexander and King Porus. A city called Bucephala was founded nearby to commemorate the death of Alexander's horse, Bucephalus. Other notable sites nearby include the 16th-century Rohtas Fort, the Tilla Jogian complex of ancient temples, and the 16th-century Grand Trunk Road which passes through the city. According to the 1998 census of Pakistan, the population of Jhelum was 145,647 and in 2012 its population is 188,803. The name of the city is derived from the words Jal (pure water) and Ham (snow), as the water that flows through the river originates in the Himalayas. There are a number of industries in and around Jhelum city, including a tobacco factory, wood, marble, glass and flour mills.
The Mangla Dam is located on the Jhelum River about 30 km from Jhelum City, it is the twelfth largest dam in the world. It was constructed in 1967 across the Jhelum River. The main structures of the dam include 4 embankment dams, 2 spillways, 5 power-cum-irrigation tunnels and a 1,000 MWpower station.The main dam is 10,300 feet (3140 m) long and 454 feet (138 m) high (above core trench) with a reservoir of 97.7 square miles (253 km²). Since its first impounding in 1967, sedimentation has occurred to the extent of 1,130,000 acre feet (1.39 km3), and the present gross storage capacity has declined to 4,750,000 acre feet (5.86 km3) from the actual design of 5,880,000 acre feet (7.25 km3). The live capacity has declined to 4,580,000 acre feet (5.65 km3) from 5,340,000 acre feet (6.59 km3). This implies a reduction of 19.22% in the capacity of the dam.
The power station of mangla dam consists of 10 units each having capacity of 100 MW. (More...)