The slope of a sewer pipe is of critical importance to any construction project. Sewer pipes contain materials that are hazardous to human health. An incorrect slope can result in a sewer pipe backing up, both costly and unhealthy. A sewer pipe must be approved by local building officials. It must also be laid by a licensed plumber. Click here for a how-to guide on sewer placement:
. http://www.inspect-ny.com/septic/SewerLineReplace.htm