What are the outputs from a drainage basin system used in mass balance calculations?

Evapotranspiration, runoff, and groundwater flow are the outputs from a drainage basin system.

How is mass balance calculated for a drainage basin?

By calculating the difference between total inputs (precipitation) and total outputs (evapotranspiration, runoff, groundwater flow) over a given time period.

How would you interpret a mass balance calculation that shows inputs are greater than outputs?

The system is gaining water and storage is increasing.

What does a positive mass balance indicate for a drainage basin?

Inputs exceed outputs, resulting in an increase in storage.

AQA A-Level Geography 7037

Water and Carbon Cycles

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Water and Carbon Cycles

Mass Balance in a Drainage Basin

3 things to know
Component 1

Overview

Recall questions on the inputs and outputs of a drainage basin, how its mass balance is calculated and how the result is read.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Key term

What are the inputs to a drainage basin system when calculating mass balance in the water cycle?

Key term

How would you interpret a mass balance calculation where inputs equal outputs?

Numbers

What is the equivalence between 1 mm of rainfall and litres per square metre?

Questions from this subtopic

Each one with the model answer underneath.

1
What are the inputs to a drainage basin system when calculating mass balance in the water cycle?
Model answer
Precipitation is the primary input to a drainage basin system.
2
What are the outputs from a drainage basin system used in mass balance calculations?
Model answer
Evapotranspiration, runoff, and groundwater flow are the outputs from a drainage basin system.
3
How is mass balance calculated for a drainage basin?
Model answer
By calculating the difference between total inputs (precipitation) and total outputs (evapotranspiration, runoff, groundwater flow) over a given time period.
4
How would you interpret a mass balance calculation that shows inputs are greater than outputs?
Model answer
The system is gaining water and storage is increasing.
5
How would you interpret a mass balance calculation where inputs equal outputs?
Model answer
The system is in equilibrium, with no net change in storage.
6
What does a positive mass balance indicate for a drainage basin?
Model answer
Inputs exceed outputs, resulting in an increase in storage.

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