For some applications you may wish to use more than one irrigation zone. For example, different crops may require separate zones. On sloping ground it is preferable to have a number of irrigation zones where each zone is at a different level. For each additional zone (maximum of six) you will need an evaporator, a control dripper, a solenoid valve, and a float switch. To install measured irrigation in additional zones you will need the MI Six Zone Adaptor in conjunction with the DIY Solar Drip Irrigation Kit.