Geography · GCSE · Rivers & Coasts

Flood risk and hydrographs

gcse-geog-3-1-3-3eFree1:58Heddy Score 1 of 7, below the standard

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What you need to know

  • A hydrograph shows how river discharge changes after rainfall.
  • The lag time is the gap between peak rainfall and peak discharge.
  • Steep slopes, impermeable rock and urban land shorten the lag time.

In this clip

1:03–2:09Natural hazards and hazard riskgcse-geog-3-1-1-1
2:09–7:07Plate tectonics theory and where hazards happengcse-geog-3-1-1-2a
7:07–10:16Effects of and responses to earthquakes and eruptionsgcse-geog-3-1-1-2c
10:16–11:32Living with tectonic riskgcse-geog-3-1-1-2d
11:32–12:56Global atmospheric circulation: pressure belts and windsgcse-geog-3-1-1-3a
12:56–15:43Where and how tropical storms formgcse-geog-3-1-1-3b
15:43–17:16Natural and human causes of climate changegcse-geog-3-1-1-4b
17:16–17:54Extreme weather in the UKgcse-geog-3-1-1-3f
17:54–20:34A small UK ecosystemgcse-geog-3-1-2-1a
20:34–22:19Rainforest climate, soils and interdependencegcse-geog-3-1-2-2a
23:10–24:10Deforestation: rates, causes and impactsgcse-geog-3-1-2-2c
24:10–24:37Managing rainforests sustainablygcse-geog-3-1-2-2d
24:37–25:11Cold environments: climate, permafrost and interdependencegcse-geog-3-1-2-4a
25:11–26:53Waves and coastal erosion, transport and depositiongcse-geog-3-1-3-2a
26:53–28:00Coastal landforms of erosiongcse-geog-3-1-3-2c
28:00–28:38Coastal landforms of depositiongcse-geog-3-1-3-2d
28:38–29:32Managing the coastgcse-geog-3-1-3-2e
29:32–31:38River erosion, transport and depositiongcse-geog-3-1-3-3b
31:38–33:07River landforms of deposition: levees, flood plains and estuariesgcse-geog-3-1-3-3d
33:07–35:05Flood risk and hydrographsgcse-geog-3-1-3-3e
35:05–36:10Managing river floodsgcse-geog-3-1-3-3f
Also coversConstructive, destructive and conservative plate marginsgcse-geog-3-1-1-2b
Also coversStructure and features of a tropical stormgcse-geog-3-1-1-3c
Also coversEffects of and responses to tropical stormsgcse-geog-3-1-1-3d
Also coversGlobal ecosystemsgcse-geog-3-1-2-1b
Also coversWeathering and mass movement on cliffsgcse-geog-3-1-3-2b
Also coversThe long profile and cross profile of a rivergcse-geog-3-1-3-3a
Heddy Score1/7, Below the standard
  • Trusted source · failed. The creator's own upload, live and playable here.
  • On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
  • Spec-true · not judged yet. Accurate, and right for the current UK specification.
  • Focused · passed. One idea, short enough to watch in one go.
  • Accessible · not judged yet. Good captions, clear sound and pictures.
  • Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
  • Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
★ passed · ☆ pending · ✕ failed
Our students

Not enough students yet

Our own students' answers. These are what move ★7 Proven.
How the Heddy Score works

Why we picked it

Thirty-six-minute recap of AQA GCSE Paper 1 with fine chapters; good for Year 11 revision.

Miss Kelly on YouTubechecked 2026-10-16