The water tank HM 163.20 is necessary if the the flume HM 163 is extended to a larger experimental length to ensure that there is always sufficient water available.
The water tank is manufactured from GRP and is equipped with an aluminium cover. The cover has an anti-slip surface; it thus possible to walk on the tank.
If the experimental section is extended to 10m, one additional tank HM 163.20 is necessary, if it is extended to 12,5m, two additional tanks are needed. As the flume already includes two tanks, at the length of the experimental section of 12,5m the number of tanks is increased to four.