Measuring the Spring in Lag Wood

We took a series of measurements yesterday to try and get a more accurate idea of how the spring in Lag Wood contributes to the volume of water flowing in the Herring Stream when our spring is at its height. We found that 0.29 cubic meters of water per second was flowing from the tunnel that runs below the railway line. There has been no significant rain for 48 hours and thus the contribution of surface water runoff would be negligible.

We also think that the 1st of January was fractionally below peak in a usual winter thus a figure of 0.3 m3/sec would be a useful working number. And a happy new year by the way!

Finding the diameter of the tunnel and height of water. Pic by Sue Milnthorpe.