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geer > 2000 > poster > synthesis on the impact of 20th century water-management and land-use practices on the coastal hydrology of southeastern florida > temporal variation in canal stage and the canal discharge
Synthesis On The Impact of 20th Century Water-Management And Land-Use Practices On The Coastal Hydrology Of Southeastern Florida
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Decreasing average seasonal discharge at coastal structures along the Miami River, North New River, Hillsboro, and West Palm Beach canals compare with a temporal increase in seasonal canal stage. Observed variability in canal flow prior to the 1960's can be partly explained by a drainage system that was under construction or in planning stages. Historic Everglades Agricultural Area canals, which drain to the major canals, were shallow and had limited capacity. They were not yet regulated by control structures. Accordingly, upstream areas tended to be overdrained during wet season months (June to October) and lacked storage capacity during dry season months (November to May). Operational changes were put in place by the 1960's and helped to dampen or reduce high flow rates and increase low flow rates during extreme hydrologic events. The seasonal dampening of discharge is strongly evident in the coastal structure hydrographs shown here. The decreasing trend in surface water discharge suggests a net loss occurs within the hydrologic system of Palm Beach, Broward, and Miami-Dade Counties. This is attributed to increased seepage losses from canals to the aquifer caused by increased well withdrawals. An increase in coastal canal stage may reflect operational changes in the surface-water conveyance system, possibly in response to the need to inhibit salt-water intrusion.
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Last updated: 04 September, 2013 @ 02:07 PM (KP)
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