it's where the brandenburg ranger association has been testing a water management system to combat drought. ranger months but new monitors and adjusts the water supply. these streams allow water to flow from one like to the next like a string of pearls. a network of sluices allows the rangers to block the water so that it can't flow out of the lakes as easily. here we have raised the water level here by 20 centimeters in other words the water level in the lake is 20 centimeters harder than it was before. because the lake water level and the groundwater levels are interconnected the groundwater level has also increased by 20 centimeters. once he said to me talk he. the lakes now supply the surrounding fields and meadows with water. that's also helping revive a marsh that had run dry. the groundwater level here is rising again. the results of this test are being used by rangers and farmers to devise ways to replenish the water table. in the future this list will be used to retain water rather than to allow it to flow that also requires cooperation from local farmers. in coles as a merino tha