Ideally, some sediment scientists argue, high flows should be annual events.
High flows of water can also disturb sediment and make it settle out in new deposits that can clog oyster beds or require new dredging in shipping channels.
And sewage in the high flows from the hurricane can lead to higher concentrations of E. Coli in areas that use surface water for drinking, he said.
Under natural conditions the Dnieper had high flows during the spring and fall and low flows during the summer and winter; but dams have altered this regime, so that the river now has pronounced high flows in spring, diminishing flows in summer, and low flows from September to March.
Linear parks are being created along the river banks to provide space for leisure and recreation when the river is flowing normally, and to hold the extra water in times of high flows.
The resulting weathering products were flushed out during high flows.
At high flows, this proportion increases to 45%.
Results indicated that, high flows and extreme high flows (one in ten year high flows/large flood events) were poorly represented both in terms of timing, frequency and magnitude.
Large pump heads or dedicated pumps are needed for the high flows required in preparative systems.
In terms of the clarification process, the enhancement was remarkably good; especially at high flows.
At the Nakdong River, high flows are reduced by dams and the river bed is degraded.
