Hydrology and Water Dynamics
Like Duolingo, but for Hydrology and Water Dynamics. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
For the part of you with thirty open tabs that never became anything.
91 levels across 8 sections, about 182 minutes end to end, roughly 36 days at five minutes a day. It moves through The Water at Your Feet, The Hidden World Underground, Rivers and the Moving Landscape, The Great Atmospheric Cycle, The Chemistry of Water, Human Engineering and Management, Measuring and Predicting Flow, and Extremes and the Global Future. It starts from scratch.
Free forever · No credit card · iPhone & Android

Key ideas in Hydrology and Water Dynamics
- Water naturally seeks the lowest point due to gravitational pull
- Porous surfaces like soil allow water to enter the ground
- Elevation differences create the energy that moves water across a landscape
- Solid, non-porous materials force water to stay on top and move sideways
- Gravity as the primary driver of water movement
- Distinguishing between thirsty and sealed surfaces
- Different soil types have different maximum speeds for absorbing water
- Puddling happens when the 'speed limit' of the soil is lower than the rainfall rate
- Water moves through soil as a distinct wave rather than dampening everything at once
- The wetting front marks the transition point between saturated and dry zones
- Understanding infiltration capacity as a speed limit
- Runoff is triggered when rainfall intensity exceeds the ground's ability to swallow it
- Saturation or high intensity prevents water from entering the soil, forcing it to move over the surface
- Recognizing the wetting front
- The cause of surface runoff
- Soil is a porous medium, not a solid block
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives Hydrology and Water Dynamics the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
What happens when rain hits a 'thirsty' surface like a forest floor?
Get it right to open this lesson and 90 more in the app.
Where Hydrology and Water Dynamics takes you
Discover how water shapes our world, from the hidden movement of underground aquifers to the powerful dynamics of river systems. Learn to read the landscape and understand the complex cycle that sustains life on Earth.
- 1
The Water at Your Feet
- The First Five Minutes of Rain
- Soil as a Storage Tank
- 2
The Hidden World Underground
- Deep Water: Aquifers
- Springs and Natural Outlets
- Karst: The Swiss Cheese Landscape
- 3
Rivers and the Moving Landscape
- The Shape of Flow
- Watersheds and Basins
- Floodplains and Buffers
- Estuaries and Deltas
- 4
The Great Atmospheric Cycle
- The Invisible Lift
- Snow: The Slow-Release Battery
- The Global Conveyor Belt
- 5
The Chemistry of Water
- The Universal Solvent
- Nature's Filters
- The Chemistry of Pollution
- 6
Human Engineering and Management
- Controlling the Flood
- Moving Water for Food
- Urban Hydrology
- 7
Measuring and Predicting Flow
- The Tools of the Trade
- Reading the Hydrograph
- 8
Extremes and the Global Future
- Drought: The Creeping Disaster
- Flash Floods and Debris Flows
- The Future of the Cycle
8 sections · 23 units · 91 levels. Built to play, not to enroll.
You pick the voice
Hydrology and Water Dynamics is taught in the The Professor style: clear, structured, thorough. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start Hydrology and Water Dynamics today.
Download Tomo, search Hydrology and Water Dynamics, and play your first lesson in under a minute.