Hydrographs are an important tool for the representation of hydrological data.
HM 141 is used to irrigate a sand bed with precipitation of varying duration and intensity. Using different drainage methods, the temporal relationship between precipitation and drainage is demonstrated.
The trainer includes a tank with a sand filling, which is flowed through by water. The water is supplied to the tank via a precipitation device with two nozzles that can be adjusted separately via valves. To study different drainages, the water is drained either via a drainage pipe or a drain chamber, which is separated from the experimental section by a screen.
The draining water is distributed over 17 transparent chambers. This creates a profile over time of the water drain. The water levels are measured and plotted in a hydrograph.
Drip pans can be used to demonstrate the lag of the drainage through rainwater retention basins.
The water supply is controlled by a valve and read on a flow meter. The timed discharges are adjusted via electronic timers.
