We removed these lines and capped it off, and then extended the Retention Wall up to where the water supply line was capped off.
First we dug back to discover where the water supply line comes from. It turned out to Tee off the main irrigation water supply line. The main irrigation water supply line is a 1 1/2 inch PVC line running, in this section, parallel to the back of the house -- about 31 or 32 inches away from the foundation of the house. The Tee for zones 6 and 7 is 72 to 74 inches West of the corner of the house (next to the Iris Garden). We replaced the schedule 20 PVC with schedule 40 PVC.
We then ran the line down to the Retention Wall, dropped it down (since the ground is sloped down)
and then we ran it thru where the Retention Wall will be and reattached the valves for Zone 6 and Zone 7. We taped the electrical control wires to the bottom of the PVC pipe.
This positions them to be used for irrigation lines to service what will some day be the lawn part of the West lawn, and the Central Lawn area.
The main lines are 1 1/2 inch lines. They are stepped down to 1 inch lines for the valves. The valves have 1 inch input and 1 inch output. We will probably step that down to 3/4 inch lines with 1/2 taps for each sprinkler head.