Formulating enquiry questions

“River characteristics” is a topic, but “How does channel width change with distance downstream along River Y?” is an enquiry question. It identifies a characteristic to measure, a possible pattern to investigate and a river location. River Y is an example name; in your own enquiry, use the actual river and, where appropriate, the stretch being studied.

A useful question must be answerable through the evidence you can collect. “What is everything that affects River Y?” is too broad for a short fieldwork investigation. A focused question about differences between selected sites gives you a realistic route from observations to a conclusion.

Choosing what to investigate

River questions can investigate change, differences or relationships. For example:

• Change: “Does average water velocity increase with distance downstream along River Y?” Velocity describes how fast the water moves.
• Change: “How does the channel cross-profile change downstream along River Y?” A cross-profile is a section across the channel, showing its width and depth.
• Differences: “Do river gradients differ between two locations with contrasting rock types?” Gradient describes the steepness of the river’s slope.
• Relationships: “Does discharge increase with distance downstream along River Y?” Discharge is the volume of water passing a point each second, not simply its speed.

Each question directs attention towards particular evidence. A width question needs width measurements at different downstream positions. A question comparing gradients needs gradient measurements at both locations. This connection between the question and the evidence is what makes an enquiry investigable.

Questions beginning “why” can also be useful, but explanation needs more than identifying a pattern. “How and why does the cross-profile change downstream?” requires evidence about the channel shape and relevant factors that might help explain the differences. Keep the question manageable for the task and available time.

Linking a question to geographical theory

Geographical theory helps you decide what pattern to investigate and what you might expect to find. The Bradshaw model is commonly used in river enquiries to describe expected changes downstream, including increasing channel width, depth and discharge.

This gives a reason to compare upstream and downstream sites rather than choosing unrelated measurements. It also provides a prediction against which you can compare your results. A model is an expectation to investigate, not a result you must reproduce: your fieldwork may reveal local differences or a pattern that does not match the prediction.

Distinguishing the question, aim and hypothesis

These three statements are connected, but they do different jobs. Consider this enquiry:

• Enquiry question: “How do channel width and depth change with distance downstream along River Y?”
• Aim: “To investigate changes in channel width and depth with distance downstream along River Y.”
• Hypothesis: “Channel width and depth increase with distance downstream along River Y.”

The question asks what happens. The aim states the purpose of the investigation. The hypothesis predicts an answer that measurements can support or challenge. A hypothesis should therefore contain a testable prediction, rather than just stating that you will study a river.

Adapting the question to the location and task

The best question fits the river you can actually investigate. Consider the accessible stretch, the sites available, the time allowed and whether evidence can be collected safely. Restricted access may mean that you can investigate only part of a river, so the wording should reflect that limit.

For example, if a task allows visits to three accessible sites along one stretch, “How does channel width vary between the three study sites?” is more closely matched to the investigation than a claim to study the river from source to mouth. You can still examine downstream change, but your conclusion must apply to the sampled stretch.

If the task instead compares two locations with contrasting rock types, a suitable question is “Do river gradients differ between the two locations?” This uses the comparison built into the task. It does not assume in advance that rock type is the only explanation for any difference.

To formulate your own question, start with the geographical focus, choose the characteristic or relationship to investigate, and specify the location or comparison. Then check whether the available fieldwork could genuinely answer it. That check prepares you to choose appropriate methods in the next stage of the enquiry.