The Chiang Mai Provincial Irrigation Office released water from Mae Chok Luang reservoir to increase water volume in the moat.
The Provincial Waterworks Authority installed 12 tap water vending machines near the Nawarat Bridge and along Tha Phae Road in the downtown area.
Governor Suriya Prasatbandit yesterday brought almost 1,000 volunteers to clean the areas around the moat and nearby Tha Phae Gate.
The roads adjacent to the moat are expected to be crowded with people turning up for the Songkran celebration over the long weekend.
Another pollution problem, haze, is sitting slightly above safety standards at one microgramme above the 120 microgrammes per cubic metre limit, according to measurements by the Yupparaj Wittayalai School in Muang district.
The pollution problem persists despite efforts to curb it, such as water spraying to dispel dust, because farmers persist in field burning and lighting forest fires, said Mr Suriya.
Officials have installed water sprinklers on the Nawarat Bridge to curb the dust levels and provide relief to revellers.