Final answer:
To line the bottom of the trench when installing a perforated pipe with the feed holes facing up, use a layer of gravel or aggregate for efficient drainage.
Step-by-step explanation:
When placing a perforated pipe with the feed holes facing up in a trench, it is essential to ensure proper drainage and filtration. To line the bottom of the trench, you should use a layer of gravel or aggregate.
This material allows for efficient drainage by preventing soil from clogging the perforations and helps in the collection and flow of water into the pipe. As part of the pipe installation process, you would first put one end of the pipe on the table top. Ensure that it is parallel to the top of the table and secure it with masking tape. Next, lift the other end of the pipe upwards and hold it at a steady, not too high above the table while you prepare the trench for the pipe to be laid.