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September 08, 2026 - BY Admin

Stormwater Drainage Networks: Catchment Delineation and Hydraulic Grade Lines in SSA

Preventing Urban Flooding Through Hydrological Modeling

Urban expansion replaces natural absorbent soil with impermeable asphalt and concrete, increasing storm runoff volumes. Designing functional storm drainage networks protects communities from flash flooding.

Urban Drainage Analysis Workflows

Hydrology engineers pair ground terrain data with rainfall curves to size storm sewer pipe networks.

  • Rational Method Runoff ($Q = CIA$): Calculating peak discharge based on catchment areas and surface permeability.
  • Storm & Sanitary Analysis (SSA): Simulating pipe network capacity under peak 10-year and 50-year storm events.
  • Hydraulic Grade Line (HGL) Audits: Checking manhole hydraulic water heads to prevent stormwater back-surging into roads.

Learn infrastructure drainage design in our Civil 3D Pipe Networks Course.

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