Along much of the Snake River is a system of levees to protect against flooding. Source: Internet
Artificial levees block spring flood water that would bring fresh water and sediment to marshes. Source: Internet
Although the spill was slowed by levees and diverted by way of the Guadalquivir to the sea, the vulnerability of Doñana's ecosystems to such environmental catastrophes was evident. Source: Internet
Deposition of levees is a natural consequence of the flooding of meandering rivers which carry high proportions of suspended sediment in the form of fine sands, silts, and muds. Source: Internet
Because the levees are some distance from the river, at high tide the Lower Rhine has more room for widening than the Upper Rhine. Source: Internet
Additionally, rain is a big factor here," said DHS chief Michael Chertoff about water pouring over the tops of the levees. Source: Internet