The handling of the water supply already existing was done by the building of reservoirs, large-scaled ones (e.g. the Pa Sak Jolasid Dam, the Pak Phanang Dam) as well as different-sized ones in all the regions. These dams have ensured an all-year-round water supply for crucial economic purposes --- for consumption, cultivation, irrigation, and hydro-electricity, also at critical times of unseasonal rainfalls, droughts, floods, and unexpected natural hazards, except in cases of extreme weather patterns. The reservoirs serve to harvest and store rainwater for later use, and to regulate water excess as flood-control measures as well. As for small or average pieces of land, to ensure constant and abundant water for crops and households particularly in the dry season, His Majesty’s “New theory” has been applied. A solution to water shortage, the theory provides guidelines on the effective management of farm land and water source by designating 30% of each piece of land to be a water pond. This initiative has spread happiness and done much good to the villagers because it helps increase their incomes.