Mike,Irritation costs can be hidden,as you know,resovior liners,3 phase power for pumps,wells,retaining walls for drawdowns,pumps themselves,central controls(computers)water costs,bunker misting zones preventing wash-out and erosion,etc and we always take the heat re costs(30% total project?)but generally speaking our technology is designed for longer lifetimes than 15-20 years ago.The slower the water moves(pipe sizes,VFDS,single head computer controlled flowzones) the longer the system lasts saving capital costs and repair labour,as does half heads saving water and pumping costs.Unlike shapers and gcas, all our work is buried and rarely any credit,only if we *$*& up,or when can we give water so walk a mile in a ditch diggers shoes........Greg