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Rivers & Erosion

Water shapes the land.

Follow a river from the highlands to the floodplain. Small changes leave a lasting trace.

Paint land

Choose Raise or Lower, then click or drag on the land. Paint while paused, then resume to see the water respond. Lowering stops at bedrock. Restart clears your edits.

Falling streaks show rainfall. Pale streaks on the water follow the flow; cloudier water carries more sediment.

Changes apply immediately. Zero rainfall stops the upstream supply too. At 100% resistance, no new soil is eroded.

0.0soil removed
0.0soil deposited
0.0sediment in water

Volumes in model units; removed and deposited show the river’s net changes, excluding painted soil.

0:00 simulated

Try 5×, then Ground change to reveal the river’s work. Restart keeps your rainfall and soil settings. This is an accelerated, simplified landscape, not a flood forecast.

What’s happening in Rivers & Erosion?

A river changes the land as it flows. Water can pick up soil, carry it downstream and leave it somewhere new.

Try this: Choose Raise land and drag across the river to build a ridge. Run time to see where the water goes. Try Ground change to see where soil moved.