HM 165 Basic Hydrology System

The illustration shows the flow of water during a short shower of rain on unsaturated soil. Here time in minutes is plotted on the x-axis, the drainage of the water in litres per hour is read off on the y-axis. The grey area symbolises a shower of rain with a yield of 720litres per hour. The curve represents the flow of the water over time as it drains away Measured result