Water begins to accumulate
Choose an area, rainfall intensity and duration. After assumed surface losses, part of the rainfall becomes runoff.
How does local flooding affect downstream areas?
Rainwater takes time to reach drains and rivers. When water arrives faster than it leaves, storage rises and surface flooding can develop.
Simplified model: gravity and pumps can discharge in parallel. Each area follows predefined model connections; the simulation does not automatically select a route.
Change in storage = inflow − outflow
Follow the water on the map
Runoff arrives after a delay
Water moves into local drainage storage. Blockages reduce discharge capacity and can increase surface flooding.
Water moves downstream
Gravity and pump discharge reach the receiving river after a travel delay. River levels respond to the volume arriving.
Where does water go in this simulation?
| Area | Modelled connection | Downstream route |
|---|---|---|
| Chow Kit | Drainage + example pump RP03 → S01 (Gombak upstream) | S01 → S03 → S04 |
| Kampung Baru | Drainage + example pump RP02 → S02 (Klang upstream) | S02 → S03 → S04 |
| Jalan Tun Razak | Gravity drainage → S02 | S02 → S03 → S04 |
| Masjid Jamek / Dataran Merdeka | Gravity drainage → S03 (confluence) | S03 → S04 |
| Bukit Bintang | Drainage + example pump RP01 → S04 | S04 → model outlet boundary |
Two branches converge: S01 and S02 contribute to S03, then S04. Model travel delays are 12 minutes (S01 → S03), 15 minutes (S02 → S03) and 18 minutes (S03 → S04), alongside storage effects. These are assumptions, not measured travel times.
Reading the visualisation
| Map element | What it tells you |
|---|---|
| Rainfall | Rain circles show scenario rainfall activity in the selected area. |
| Surface flooding | Coloured zones show modelled surface flooding. Their colours and extent are not verified real-world flood boundaries. |
| Flow & direction | Line direction and movement help you trace water transfers. Animation does not measure actual water velocity. |
| River sensors / S01–S04 | Read depth, inflow, outflow and trends. Colour thresholds vary between example stations. |
| Pump houses / RP01–RP03 | Check which pumps are operating, the delivered model flow and the river receiving that water. |
Try it: upstream rain, downstream response
- Open the map and select All flows to see the network.
- Select Try upstream rain, then Play below the map.
- Watch S01 and S02, followed by S03 and S04. Select a station to view its chart across the event.
- Continue after rainfall subsides. Water still in transit can sustain or increase downstream readings.
Each date is an independent event. Replay it and use the timeline to compare conditions before, during and after peak rainfall.
FROM SIMULATION TO A PILOT
Open POC guide →Planning a proof of concept?
Review the pilot scope, existing sensors, data requirements and example datasets in the POC implementation guide.