MARGAM, SOUTH WALES
Today the class went to the source of the River Ogmore near the town of Nant-y-moel in the Welsh valleys. The source, found on top of a hill, leads into a waterfall before flowing down the hillside and into the town, although due to a lack of rain very little water was flowing,
We took measurements at 3 upper course sites of the river, investigating aspects such as channel width, velocity, and bedload. After the final measurements were taken the class had a water fight before returning to the centre to begin the write-up of the results.
The first student to fall in was Amandeep, although Junaid H. was caught washing his face in the river by doing what looked like a press-up in the middle of the channel (key term).
Mr Pope's Gallery
Day 3 Tasks
Today's tasks were described by Matthew W in Year 10
- Width of river channel - we used a tape measure to measure from the right bank of the river to the left and then we used our results to help us with our depth results. Also it helped towards our cross section measurements and it helped with our velocity measurements accuracy.
- Depth of river channel - we measured using a stratified sampling method according to our width measurement by dividing it by 6 and measuring every (n/6) metres. Our depth measurements helped towards our cross section measurement.
- Velocity of river - we used a hydro prop impeller to measure the rate at which the water flowed, this helped towards our converted flow measurement.
We also tested things like bed-load size which we did somewhat systematically however a bit randomly with slight method to it. We also used our measurements to collect more data, such as cross sectional area, the river discharge and the hydraulic radius.
Mathematical Calculations and Statistics
(3.8255/velocity) + 0.227 = converted flow.