Hydrology basics: runoff, floods, and watersheds

What you’ll practice

Build confidence with the hydrology basics that show up in design reviews and exam prep, including runoff generation, flood estimation concepts, and watershed response.

Each question uses 4 options and there’s no timer, so you can focus on reasoning through units, assumptions, and definitions.

Difficulty and quiz setup

This quiz is mixed difficulty by design: easier items lock in vocabulary and processes, while tougher ones push interpretation and applied thinking.

You can choose how many questions to attempt and select a difficulty level to match your goal—quick revision, steady practice, or a deeper challenge.

Common pitfalls to avoid

• Mixing up discharge (m³/s) with volume (m³) or depth (mm)
• Confusing watershed boundary, drainage area, and channel network terms
• Applying runoff coefficients outside their intended land use/condition range
• Ignoring time of concentration and lag effects when thinking about peak flow
• Misreading hydrographs (baseflow vs direct runoff, peak vs duration)
• Forgetting that assumptions (uniform rainfall, steady conditions) drive method limits