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# GCSE Geography Coursework: Strand 5 - Evaluation of Data

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Introduction

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 * Gradient * Average bed-load size * Bed load roundness. 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. ...read more.

Middle

If one possibly came back at another time of the year where rainfall was more balanced (ex. winter) to compare the upper-course and lower-course attributes, then the river may fit the Bradshaw Model more accurately. The chart in the Data Presentation shows how initially, because of the storm, velocity was high, and, gradually, from site 3 onwards, increased - fitting the Bradshaw Model. (4) Gradient: Why method used was good: - Used a hand-held clinometre - a simple method which is accurate if used correctly (i.e. angle reset). Bad points on method used: - It was vital to be certain the ranging poles were mantled vertically, or else inaccuracies will incur; - We only had time for 3 readings which rendered a fairly accurate average, but would moderately affect the results if one of the results happened to be an anomaly; - It was hard to position the ranging-poles on the river bed, rather than on the rocks, especially at site 2, where water was sparse (due to the reservoirs' abstraction.). I could go back to River Calder for a more comprehensive study using smaller stretches along the course to increase precision, as the poles will be closer (thus clinometers gun's angle is more concentrated) ...read more.

Conclusion

Thus it was simplified to 3 categories: 'Angular', 'Sub-angular' and 'Rounded', - In spite of simplification, subjectivity was still dominant - it was hard to agree between a category (i.e. it was ambiguous whether a rock was really sub-angular or angular, and which category it would best fit into.) - Group members presumed that because, for example, a rock was in the upper-course that it would ALWAYS be angular; and vice-versa. - 100 stones is a small sample out of such a large population, especially in site 5, where the there were more rocks. - We had five different groups. This decreases accuracy of global results because one group's opinion on a rock's roundness differs to another group's opinion on the same rock. IF I was to measure all of the rocks' roundness at each site, on my own, the results will be more pertinent because subjectivity would not be a down factor; as everything will be through one perspective only. (However if my opinion was wrong then all the results would be wrong, making the investigation worthless.) ?? ?? ?? ?? Riyadh Abdulla Evaluation Instructor: Mr Walker GCSE Geography Spec.B Candidate Number:- 4185 Page 1 ...read more.

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