Statistical Analysis and Interpretation

Graphs and calculations to understand change along a transect line need to be made. Conversions of values collected in the field need to be made - Hydro-prop readings in seconds need to be converted into metres / second using the calibration chart.

Left - the calibration chart for recordings of velocity in metres / second.

1. Mean, modes and median values could be calculated for depth.

2. Depth and width measurements can then give you the cross-sectional area.

3. Velocity multiplied by the cross-sectional area will then give you the discharge (Q) in cumecs.

4. Cross-sectional area divided by the wetted perimeter will calculate the hydraulic radius.

5. A Spearman's Rank Correlation could then be calculated for two related data sets - for example depth and width, or width correlated with discharge.

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