control unit dcu 70 will pick up the irrigation cycle where it left off thereby always uniformly irrigating the landscaping if the system happened to be in the middle of the irrigation cycle when the level in the storage tank 92 falls to its low level sensor 100 the digital control unit dcu 70 halts the irrigation cycle and switches to storage tank fill mode once the storage tank fill cycle is completed the digital control unit dcu 70 switches back to irrigation mode and resumes the irrigation cycle one way check valve 139 ensures that no water from the irrigation sub system 28 can siphon back to the automatically controlled multi port distribution valve assembly dva 26 optional booster pump 142 can be added to the system when additional water pressure is needed for irrigation for example a sloped or hilly yard in order to protect the house 39 s yard from under watering an end user configurable timer is provided if the system goes without irrigating the landscaping for longer than allowed by the timer the digital control unit dcu 70 will open the high flow fresh water valve 74 and flow enough water to finish running one complete irrigation cycle in order to protect the house 39 s yard from over watering the digital control unit dcu 70 has an end user configurable sub routine that limits the number of irrigation cycles in a set time period once the final irrigation cycle has been completed for the set time period the digital control unit dcu 70 stops the sump.