Water Stores, Transfers and Catchments
Explaining the distribution and movement of water through atmosphere, ocean, land and cryosphere, with catchment hydrology and water budgets.
How to study A-level Geography
Frame the issue by place, space and scale, explain the operating processes, interrogate evidence, compare players and contexts, then reach a qualified judgement.
Core concepts
Concept 1
Water stores differ greatly in size and residence time across oceans, ice, groundwater, surface water, soil and atmosphere.
Exam cue: Identify the store, transfer, direction and time scale in every process explanation.
Concept 2
Transfers include evaporation, condensation, precipitation, infiltration, percolation, runoff, groundwater flow and cryospheric processes.
Exam cue: Use an input-output-change budget rather than treating discharge as an isolated value.
Concept 3
A drainage basin is an open system whose water balance responds to physical conditions and human actions.
Exam cue: Link hydrograph response to antecedent conditions, basin characteristics and land use.
Risk pitfalls and guardrails
Confusing a water store with a transfer.
Guardrail: Do not replace process explanation with case-study narration, source evaluation with description, or a valid board route with an invented mix of optional themes.
Assuming all precipitation becomes channel runoff.
Guardrail: Do not replace process explanation with case-study narration, source evaluation with description, or a valid board route with an invented mix of optional themes.
Ignoring groundwater and time lags.
Guardrail: Do not replace process explanation with case-study narration, source evaluation with description, or a valid board route with an invented mix of optional themes.
Memory anchors
Water Store
A water store holds water for a characteristic residence time.
Water Transfer
A water transfer moves water between stores or within a system.
Drainage Basin
A drainage basin is the area supplying water to a river system, bounded by a watershed.
Water Budget
A water budget accounts for inputs, outputs and change in storage.
Residence Time
Residence time is the average time water remains in a store.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Which transfer moves water from soil and vegetation to the atmosphere?
A basin receives 1,120 mm precipitation and loses 610 mm by evapotranspiration and 470 mm by runoff. What is storage change?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
What is Pass Harbor?
Completely free exam prep for 247 UK exams.
- Practice questions
- Flashcards
- Study guides
- Mock exams
- No registration
- No paywall
- Start instantly
“No more expensive exam prep. Quality study tools should be accessible to everyone.”