Working Principle

Interception and Diversion (I&D) structures are integral to used water management systems, particularly in towns where used water is discharged into open drains or natural water bodies. These structures are strategically constructed to intercept dry weather flows from existing drains and divert them toward treatment facilities, thereby reducing pollution and improving environmental and public health outcomes.

Purpose and Application

• Intercept untreated used water from stormwater drains, especially during dry weather, to prevent direct discharge into water bodies.
• Divert flow towards centralized or decentralized treatment facilities using gravity or pumping, depending on site conditions.
• Bypass or overflow of excess stormwater during peak flow events.
• Improve water quality in receiving drains and downstream ecosystems by eliminating dry weather pollution loads.