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Alright. Quick storm hydrograph recap. Two to three minutes. Let’s lock it in. First: what a storm hydrograph actually shows. It’s a graph of river discharge over time. Discharge is flow. Not a store. Keep that in your head. Now, where do stores, flows, and outputs show up? Stores are the “holding areas” in the drainage basin. Think: interception on leaves. Water in the soil. Water in rock and groundwater. Stores don’t appear as a separate line on the hydrograph. But they control the shape. Big stores soak up water. That usually means a lower peak and a longer lag time. Small or already-full stores mean water reaches the river fast. Higher peak. Short lag. Flows are the pathways to the channel. Overland flow is fast. That pushes the rising limb up steeply. Throughflow is slower. That helps keep discharge going after the peak. Groundwater flow is slowest. That supports baseflow and makes the falling limb gentler. Outputs are water leaving the drainage basin system. The big output shown on the hydrograph is river discharge itself. Other outputs like evapotranspiration matter, but they don’t spike during the storm the way discharge does. So, hydrograph shape in one simple picture: Rising limb = quick water arriving. Peak discharge = maximum output through the channel. Falling limb = slower stores draining back out. Next: feedback. Positive vs negative. Use these sentence formulas. Positive feedback: “A change causes effects that increase the original change.” Example idea: soil gets saturated, so more overland flow happens, so discharge rises faster, which can lead to even more flooding. Negative feedback: “A change causes effects that reduce the original change.” Example idea: vegetation intercepts rainfall, so less water reaches the ground quickly, so the peak discharge is smaller. Finally: two exam pitfalls to dodge. Pitfall one: confusing discharge as a store. Discharge is not water being held. It’s water moving past a point per second. If you write “discharge store,” your examiner quietly sighs. Pitfall two: mixing infiltration with throughflow. Infiltration is water going from the surface into the soil. Throughflow is water moving sideways through the soil toward the river. Infiltration is the entry. Throughflow is the journey. That’s it. If you can link each part of the hydrograph to fast flow, slow flow, and storage size… you’re in control.

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