I am planning to build a *water tower for garden irrigation. I live in NC and have a 45'x70' garden so this time of year I need a considerable amount of water. Given how little rain we've been getting I believe I'll have to use my pond as a reservoir to help meet my irrigation needs. All this said, I'm trying to determine how I want to support the tower. My thought is to have (2) 330 gallon IBC totes elevated to about 10'-12' and possibly add (2) 275 gallon IBC totes below those, ~6'-8' off the ground.
Given the incredible load this would create I figure the easiest thing to use as a support structure would be pallet racks. Does anyone have any thoughts on this? I plan to side the sides and roof to keep the weather off of whatever structure I use. The tower would be located on the back side of my house, where I could get approximately half of my roofs downspouts pouring into the system. Given the proximity to my house I want to make sure the tower does not topple. Would it be alright to set the pallet rack on a stone & sand bed or should I pour a re-bar reinforced cement pad? Generally speaking this side of my house is very dry as there is a sump pump on the other side of the foundation wall. The pump discharges a fair distance away, 4-5ft below the grade of where the tower would be located.