First, the irrigation system has always been a monolithic system in which a break in one part breaks everything. For example, if a greenhouse faucet breaks, then the mist bench is dry while the repair is made. If unprotected pipes burst in a freeze, again, the mist bench is dry while the repair is made. Furthermore, many sections of pipe have always been exposed to the elements necessitating that prior to a freeze the entire system be drained for the duration of the freeze. In a nutshell, this act was getting very old! So the system was compartmentalized, and the pipes were buried in the deep bosom of the warm earth.