The egg-shaped sewer is placed, such that:

Explanation:

The egg-shaped sewer is designed for combined sewer systems, which carry both sanitary sewage and stormwater. It has a narrower bottom and wider top, and is placed with the smaller (narrow) end at the bottom for the following reasons:

• Self-cleansing velocity: During dry weather (low flow), the narrow bottom ensures higher velocity to prevent sediment deposition.

• High discharge capacity: During storms, the upper wider section accommodates large volumes of water.

• The smaller base (narrower section) supports the broader upper portion of the sewer.

Additional InformationEgg-shaped Sewer

Shape and Design:

• The sewer has a distinctive egg-like shape with a narrower bottom (smaller base) and a wider top (larger base).

Purpose:

• Primarily used in combined sewer systems to handle both sanitary sewage and stormwater flows.

Flow Efficiency:

• The design is intended to optimize flow conditions during varying discharge rates.

• Self-cleansing velocity is achieved by the narrow bottom section, which promotes higher velocity during low flow conditions, preventing sedimentation.

Capacity:

• The wider top section provides more capacity during high flow conditions, such as during heavy rainfall or storms, allowing the system to handle increased discharge.

Advantages:

• Minimizes sediment deposition during low flow by maintaining sufficient flow velocity.

• Increases discharge capacity in storm conditions due to the larger upper section.

• Optimized for combined sewage systems by providing efficient flow at various conditions.