![]() ![]() ![]() Sewers on 20 percent slopes or greater should be anchored securely with concrete anchors spaced as follows: ![]() Where velocities greater than 4.6 m/s (15 ft/s) are attained, special provision should be made to protect against pipe displacement by impact and erosion". Higher velocities should be avoided unless special precautions are taken. The velocities in sanitary sewer systems should not be more than 3 m/s (10 ft/s), especially where high grit loads are expected. Sulphide problems can be minimized by designing for sewers to flow less than full under peak flow conditions and to flow at velocities of 0.6 m/s (2.0 ft/s) or higher. "In sizing sanitary sewers and selecting sewer slopes, consideration should be given to possible sulphide generation problems. ![]()
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