This document is the Minimum and Maximum Cover Heights for SaniTite HP Pipe - Storm/Sanitary Applications. Cover Heights and mechanical properties explained.

The information in this document is designed to provide answers to general cover height questions; the data provided is not intended to be used for project design. The design procedure described in the Structures section of the Drainage Handbook provides detailed information for analyzing most common installation conditions. This procedure should be utilized for project specific designs.

The two common cover height concerns are minimum cover in areas exposed to vehicular traffic and maximum cover heights. Either may be considered "worst case" scenario from a loading perspective, depending on the project conditions. Fill heights presented in this technical note are applicable to open profile 300 mm through 750 mm (12”-30”) ADS SaniTite HP pipe manufactured in accordance with CSA B182.13.

For minimum cover in traffic areas, pipe diameters from 300- through 1200 mm (12”-48”) installed in traffic areas must have at least 0.3 m (12 in.) of cover over the pipe crown. The backfill envelope must be constructed in accordance with the Installation section of the Drainage Handbook and the requirements of ASTM D2321 and CSA B182.11. Table 1 shows the minimum cover requirements for the ADS SaniTite HP for traffic loading cases.

The maximum burial depth is highly influenced by the type of backfill and level of compaction around the pipe. General maximum cover limits for ADS SaniTite HP pipe used in storm drainage and sanitary sewer applications are for a variety of backfill conditions.

A figure shows the ADS SaniTite HP pipe Trench Detail under pavement. Table 2 shows the ADS SaniTite HP mechanical properties, Table 3 lists values for maximum cover.