Alaska Collection Systems: Level 1-2 Components, Maintenance & FOG Control
This guide covers the collection-system fundamentals a Level 1/2 Alaska operator is tested on: system components, preventive maintenance practices, and fats/oils/grease (FOG) and sanitary sewer overflow (SSO) control, ahead of the advanced-tier inflow/infiltration and system-math material.
Collection System Components
Gravity sewers rely on slope and velocity (typically a minimum self-cleansing velocity around 2 ft/sec) to keep solids in suspension and prevent settling. Manholes provide access for inspection/maintenance and are placed at changes in grade, alignment, or pipe size, and at regular intervals along straight runs. Lift/pump stations move wastewater where gravity flow isn't feasible (relevant to Alaska's varied terrain and permafrost-affected areas where deep gravity trunk lines aren't always prac