Explanation

Warsak Dam is known as the smallest dam in Pakistan.

This dam finished under the access of the Colombo Plan in two phases

Warsak Dam is a mass concrete gravity dam located on the Kabul River in the Valley of Peshawar

Warsak Dam is built on the Kabul river

Construction began 1949

Opened: 1960

Height: 76 m

Length: 140.2 m (460 ft)

Warsak Dam was completed under the Colombo Plan in two phases and financed by the Canadian Government. 

while 

Largest dam of Pakistan is the Tarbela Dam