# GCSE Geography Coursework: Strand 5 - Evaluation of Data

Riyadh Abdulla        Evaluation _                        Instructor: Mr Walker

This is the Evaluation section of the coursework folder on the geographical investigation conducted around the River Calder, Garstang; based on the following hypothesis - ‘Does the River Calder fit the Bradshaw Model.’ The Bradshaw model is in figure 1.

• #1– approximately 4km from source. Grid reference 548 487.

• #2- approximately 5.2km from source. On Grid reference 539 482.

• #3 – On Calder Vale; approximately 8.3km from source. Grid Reference 533 482.

• #4 – Sandholme Mill; approximately 11.4km from source, grid reference 517 434.

• #5- Catterall playing fields; approximately 14.3km form source, grid reference 494 433.

These are the factors which were measured and are going to be evaluated:

• Channel Width
• Channel Depth
• Water velocity
• Discharge

Refer to the ‘Methodology’ section of the coursework folder for information about the methods used to measure each of these attributes.

1.       Channel Width:

Why the method used was good:

• The only skill required is a tight grip on the tape;
• Method is pretty straightforward to follow.

Bad points on the method used:

• Precision in result was very important. Sometimes we struggled to maintain the grip on the tape tight due to the flow of the water; therefore it was time consuming constantly readjusting the tape,
• It was hard for some in our group to practically accustom to the method’s rules.

We managed, after some time, to accumulate data; although at times we were dubious whether we held the tape tight/away from the current of water – as this may have lead to anomalies/inaccuracies in our results.

However, our conclusion states otherwise as the trend of results follow that of the Bradshaw Model’s, thus inaccuracies must be minimal.

We may used a more precise method such as the ‘tape mantling’ (keeping the tape tight using a tool so one does not need to hold the tape tight at each end) – this may have lead to greater accuracy in our results for surface-area (hence Discharge).

Weather was stormy prior to our arrival; this increased velocity, making it less probable/harder to maintain a tight grip.

If I was to go back to River Calder, I would do so on a ‘calmer’ day in winter, where the velocity in the upper and lower-course is constant (i.e. no rain) as, then, there is a better chance of obtaining more accurate results.

I will also try to compare my results with that of a similar river which does not have any sources of abstraction, such as reservoirs, to see how precise my results were in comparison; and the effects the reservoirs had on the channel’s width.

1.        Channel Width:

Why method used was good:

• Novice level; person from group has to ‘simply’ prod ruler into the river – other group members simply read off/check the depth’s result.
• There is not a high volume of water; easier to avoid ...