Installing a Fixed Irrigation System

1). Mark out and stake the area of the garden you want irrigated, then dig a trench 20cm deep. Line the bottom of the trench with sand or sieved soil, keeping it as level as possible. Remove stones and any pieces of root.

2). Lay the main pipe at the bottom of the trench, then fit the anti-siphon or non-return valve at the point where you are taking the water supply off the main. It is important to ensure that the join is watertight.

3). Attach the spray heads to the main pipe wherever they will be needed. Attach elbows and Ts for the branch pipes. Allow the welded joints to dry out for at least six hours, but for safety preferably longer.

4). Once all the joints have set hard, turn on the water supply to check the anti-siphon device, to flush out any debris that may have got into the pipes, and to check for any leaks that may exist in the system.

5). Once you are satisfied that everything is working well, and there are no leaks, back-fill all the trenches with soil above ground level, taking care not to clog spray heads with loose earth or the system will not work.

6). With a timber beam or some similar object, tamp and firm down the soil around the spray heads, leaving them about 2.5cm above the surface. Take great care not to hit the heads as you do so.

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