- 1). Select a level that will rest against the drain or waste pipe you are measuring without contacting fittings or other obstacles. The level must rest only against the pipe.
- 2). Set the level on the top of the pipe or hold it against the bottom. Note the position of the level's bubble -- it should not be centered. Lift the end of the level until the bubble is centered.
- 3). Measure the distance between the end of the level and the pipe. The distance is the "fall" of the pipe along the length of the level. The standard fall for most drain and waste pipes is 1/4 inch per foot of pipe. On a 4-foot level, the fall should be 1 inch and on a 2-foot level, the gap between the pipe and the end of the level is 1/2 inch.
- 4). Verify the fall is in the correct direction. The pipe must slope downward from the source of the water or waste toward the main sewer or septic pipe.
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