Coastal Reservoir

A coastal reservoir is a freshwater reservoir in the sea at the mouth of a river with sustainable annual flow. It is much like a natural coastal lake which, over time is closed to the sea from siltation and converted into a freshwater lake as a result of continual flushing from river flow. For a coastal reservoir all that is needed is an impermeable barrier between salt and fresh water, which need not be as strong as an inland reservoir dam wall as the water pressures on either side are almost equal. This represents great savings in construction.