How do storage reservoirs support the Oder River during low-water periods?

During low-water periods in summer and autumn, the Oder River is supported by the gradual release of water from storage reservoirs constructed in its upper tributaries.1

These reservoirs function by impounding water during times of higher flow and releasing it as needed to regulate the river's flow volume. This process is essential for maintaining the river's utility, as the Oder has a limited flow volume and its discharge can vary significantly depending on precipitation levels.21