Seasonal storage by realizing extra surface area
Realising additional surface area for storage can serve to create additional storage volume if the fluctuations in water levels remain unchanged. Part of the standard fluctuation of 30 cm, for example, is then earmarked for peak storage, while another part serves for seasonal storage.
This means that in the winter season water levels will fluctuate between the mid-level and the maximum level, while in the dry summer season they fluctuate between the minimum level and the mid-level, since the peak storage volume required must be guaranteed at all times. The advantage to this method of seasonal storage is that the fluctuations are limited, which is good for flora along the banks.