The coastal wetlands of Louisiana are troubled enough with salt water intrusion, diversion of water for flood control and a rise in the sea level due to global warming _ all of which contributes to land loss.
22.
They prevent salt water intrusion, thus ensuring freshwater supply, and soil erosion ( mangroves protect the shorelines from erosion ) and is a natural gene bank ( the high diversity of flora and fauna provides many genetic possibilities ).
23.
Those who favor building the tunnels state that pumping water through the tunnels to the pumping plants would mitigate the problem of salt water intrusion into the delta, as the pumps would no longer pump directly from the delta.
24.
In addition to subsidence is the presence of canals which were dug through the marshes and swamps to service oil and gas wells to facilitate oil and gas exploration, which have enabled salt water intrusion from the Gulf of Mexico.
25.
For anglers the small marinas a couple of km up from Voer in, Uggelhuse, are also interesting, as fresh water fish, not least, " perch ", can gather in the marinas to avoid salt water intrusion from the sea in combination with incoming tides.
26.
In 1948, Congress passed the Flood Control Act creating the Central and Southern Florida Control Project, a multi-faceted project providing flood control; water supply for municipal, industrial, and agricultural uses; prevention of salt water intrusion; water supply for Everglades National Park; and the protection of wildlife.
27.
The structure is operated in conjunction with Calcasieu and Leland Bowman Locks on the Gulf Intracoastal Waterway ( GIWW ), Catfish Point Control Structure on the Mermentau River, and Freshwater Bayou Lock on the south side of the basin, all of which help prevent salt water intrusion into the Mermentau River Basin.
28.
They are used to divert water for irrigation, temporarily raising existing dams, flood control, water retention for aquifer recharge, reducing or preventing salt water intrusion into fresh water areas, protect low-lying coastal areas from tidal flooding, enabling fish passage past diversion works, by deflation, and for sewage retention / separation during flood events.
29.
An undesirable result can mean any of the following conditions in the groundwater basin : persistent lowering of groundwater levels, significant and unreasonable reductions in groundwater storage, significant and unreasonable salt water intrusion, significant and unreasonable degradation of water quality, significant and unreasonable land subsidence, and surface water depletion having significant and unreasonable effects on beneficial uses.
