MCG Flood Decision Support System

Key Statistics

Rainfall Partition

Water Accounting

Scenario comparison review

Rows use the same rainfall and report selected condition minus the current approved baseline. Storage, 15 cm area and persistence are the decision metrics; unusual maximum-depth spikes are retained only to flag drainage-exchange locations needing review.

Data Sources

Visual Conventions

Reviewer Notes

This review package is organised for drainage-readiness review. The primary baseline is current baseline condition; the other D-scenarios change drainage capacity, choking, dense-area debris blockage, or tailwater while keeping terrain, rainfall definition, and model workflow consistent for the selected rainfall.

Decision Use

• Use Overview to confirm the active rainfall, scenario, terrain, drainage, ward boundaries, pumps, hotspots, and overflow/backflow watch points.
• Use Key Statistics to check rainfall partition, outfall export, drain capture, drain return to surface, and water-balance closure.
• Use Interactive Map or Ward Focus to inspect exact locations, lat/lon, depth, velocity, persistence, nearby MCG hotspots, drainage watch points, pump locations, and candidate receptor or recharge areas.
• Use Flood Progression to review rainfall timing, depth growth, velocity context, and active overflow/backflow nodes.
• Use Methods and Caveats before presenting conclusions. Outputs are screening-grade and depend on the quality of drainage attributes, invert levels, tailwater assumptions, terrain conditioning, and rainfall priors.

Minimum City Data Contract

• Boundary and administration: city boundary, wards/zones, coordinate reference system, and official naming.
• Terrain and urban form: DEM/DTM/DSM, buildings, roads, LULC, open spaces, parks, and critical facilities.
• Drainage system: drains, sewers if storm-connected, manholes/inlets, outfalls, dimensions, material, desilting status, invert or slope evidence, and missing-data flags.
• Hydrometeorology: historical events, design hyetographs, IDF assumptions, boundary inflows, receiving-water/tailwater assumptions, and antecedent wetness.
• Operations and observations: pumps, sump capacities, reported nuisance points, past flood marks, road closures, monitoring points, and stakeholder priority locations.

Decision Outputs

• Scenario comparison maps for depth, velocity, persistence, and selected-scenario minus baseline difference.
• Drain performance tables showing initial fill, capture, overflow/backflow, and outfall export.
• Hotspot agreement diagnostics comparing modelled hotspots with reported nuisance points.
• Ward-level action packs with monitoring points, drainage watch nodes, pump/receptor options, recharge cautions, and caveats.
• Audit-ready metadata covering source provenance, assumptions, units, CRS, scenario names, and validation checks.