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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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Abstract | Saltwater Intrusion | Land Use and Land Use Cover | Surface Water Conveyance System | Municipal Water Use | Agricultural Water Use | Ground-Water Flow System | Canal Stage and Discharge | Impact on Ecosystem

Temporal Variation In Canal Stage And The Canal Discharge

site location mapstage discharge map87654321

Note: Click on the blue numbers above to view corresponding numbered graph sets below. Click on the above map to view a larger version of it.

Stage

Flow

West Palm Beach Canal
1 At S5AE
graph of mean stage at station S-5A

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graph of mean discharge at site S-5A

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2 At S155
graph of mean stage at S155

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graph of mean discharge at site S155

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Hillsboro Canal
3 At S39
graph of mean stage at S39-H

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graph of mean discharge at site 39

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4 At G56
graph of mean stage at G56

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graph of mean discharge at site S56

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North New River Canal
5 At S34
graph of mean stage at S34_H

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graph of mean discharge at S34

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6 At G54
graph of mean stage at G54_H

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graph of mean discharge at site G54

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Miami River Canal
7 At C6.NW36
graph of mean stage at C6.NW36

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graph of mean discarge at C6.NW36

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8 At C6.L30
graph of mean stage at C6.L33

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graph of mean discarge at C6.L30

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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.


Next: Changes to Flow System and Its Impact on the Marine Ecosystem in Biscayne Bay

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For more information contact:

Bob Renken
U.S. Geological Survey
9100 N.W. 36th Street Suite 107,
Miami, FL, 33178
Phone: (305) 717-5822
Fax: (305) 717-5801
EMAIL: rarenken@usgs.gov

Related information:

SOFIA Project: Synthesis on the impact of 20th Century water-management and land-use practices on the coastal hydrology of southeast Florida

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Last updated: 04 September, 2013 @ 02:07 PM (KP)