The Sri Lankan Chronicle, the Culavamsa which was written in the Buddhist canonical language Pali, enumerates his works both as a provincial ruler in western Sri Lanka and later as the monarch of the whole country: he either built or restored 163 major tanks (reservoirs), 2,617 minor tanks, 3,910 irrigation channels, 328 stone sluices and 168 sluice blocks, besides repairing 1,969 breaches in embankments. Among the reservoirs he built was the tank at Polonnaruwa, called on account of its size the Sea of Parakrama. With an area of 30 km² and an enclosing embankment 14 kilometers long, it irrigated nearly 100 km².
The final achievements were highlighted by Sir Henry Ward, Governor of Sri Lanka In: Collected Minutes of Brohier (1934): It is possible, that in no other part of the world are there to be found within the same space, the remains of so many works of irrigation, which are, at the same time, of such great antiquity, and of such vast magnitude as Ceylon. Probably no other country can exhibit works so numerous, and at the same time so ancient and extensive, within the same limited area, as this Island.