Water Wells need to be placed on top of Water Veins that can be found throughout the Scorched Earth map. Doing so will slowly fill up the well with water. The well can hold up to 1000 water units and will automatically refill if water is consumed from it.
It is possible to snap stone and metal Irrigation Pipes to the well to create an Irrigation system and water your plants. Both straight and vertical pipes can snap to the well. On official servers however, no structures - including pipes - may be built on or surrounding a Water Vein except the Water Well.
It is not possible to snap a pipe intake to the Water Well. To start an irrigation system from the well, you must use an irrigation pipe - straight, an irrigation pipe - vertical, or an irrigation pipe - inclined.