Derwent

Derwent (dûr`wənt), river, c.60 mi (100 km) long, rising in the Pennines, Derbyshire, central England, and flowing SE past Derby to the River Trent. Reservoirs on its headwaters supply water to the cities of the Midlands.

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Derwent

1. a river in S Australia, in S Tasmania, flowing southeast to the Tasman Sea. Length: 172 km (107 miles)

2. a river in N central England, in N Derbyshire, flowing southeast to the River Trent. Length: 96 km (60 miles)

3. a river in N England, in Yorkshire, rising on the North York Moors and flowing south to the River Ouse. Length: 92 km (57 miles)

4. a river in NW England, in Cumbria, rising on the Borrowdale Fells and flowing north and west to the Irish Sea. Length: 54 km (34 miles)

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Derwent 

a river in the southern part of the island of Tasmania. It is 209 km long and drains an area of 9,600 sq km. The Derwent rises in central Tasmania in Lake St. Clair and empties into Storm Bay of the Tasman Sea at the city of Hobart. It is fed by rain. Its mean annual flow rate is 137 cu m per sec. The river’s regime is characterized by freshets. Having many rapids in its upper course, the Derwent is navigable in its lower course. The river is used for irrigation, and it has hydroelectric power stations. The large reservoir Lake King William is located in the upper reaches.