When designing sewer mains ranging from 0.4 m to 0.9 m in diameter under peak discharge conditions, what proportional depth of flow should be assumed___________________?
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Answer: B. Half full
Explanation
Sewer mains between zero point four and zero point nine meters use half-full design. Peak discharge calculations assume this proportional depth for optimal hydraulics. Half-full flow leaves adequate ventilation space for toxic sewer gases. Gravity sewers operate as open channels under atmospheric pressure conditions. Proportional depth charts relate partial flow rates to full-flow capacities. Ventilation prevents pressure buildup and structural corrosion within sewer lines.
Municipal drainage engineers design sewer networks for future population growth. Maintaining proper flow velocity prevents sediment deposition in pipe inversions. Standard design manuals specify exact proportional flow assumptions for sizing. Full depth flow risks surcharging and basement backups during peak storms. Two-thirds full is typically reserved for larger circular trunk sewer mains. Three-fourth full depth exceeds standard design limits for medium-sized sewers.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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