The data were compiled from records from 1986 to 1999 in the USGS Ft. Lauderdale, FL office of the Water Resources Discipline in 2000. Each station has numerous individual flow measurements at gages that were used in the calculation of the mean flow for each station. The data were collected by USGS personnel and the gages are maintained and operated by USGS Ft. Lauderdale office personnel.
These data from the individual gages were transferred to electronic form to provide a better understanding of the distribution of flow from north to south under the Tamiami Trail to aid in decisions about future changes to flow along the Trail.
For Station 02289060 Roadway opening #52 was not measured prior to Water Year 2000 except on 7/24/1998.
Current meter measurements with Price AA meters and 10-foot expandable wading rods were made at those bridges having a measurable velocity. Estimates of flow through the outlets having low velocity were made by timing the movement of submerged fine sand particles in the stream. Measuring sections were on the downstream side of all bridges, unless heavy weeds were present. In 1997, a field site inspection revealed that driveway fills across the Tamiami Canal between Bridges 77 and 83 may prevent hydraulic connection along the Canal. This produced weak or inconsistent stage/discharge relationships for this station.
Station 02288900 discharge measurements: Current meter measurements with Price AA meters and 10-foot expandable wading rods were made at those bridges having a measurable velocity. Estimates of flow through the outlets having low velocity were made by timing the movement of submerged fine sand particles in the stream. Measuring sections were on the downstream side of all bridges, unless heavy weeds were present.
Station 02289040 discharge measurements: The position of the gate and/or the head differential determined the discharge measuring technique. If the gates were in the water, measurements were performed using a specially designed rod and Price current meter. If gates were open less that 0.60 ft measured at any one end of one gate, then no measurement was attempted at that gate because of the possibility of wedging the rod and meter between the gate and sill. If a gate was completely free of the water, then an inspecition of the head between upstream and downstream stages determined whether a float stick or meter was used. If the head differential was 0.02 ft or less, a float stick could be used in the gate chamber of the upstream side of the gate under the catwalk. A time of travel measurement utilizing the north and south sides of the concrete catwalk with the float stick lengths covering at least 80% of the depths could be used when mean velocities were less than 0.4 ft/sec. If the heads were greater than 0.02 ft, the a Price current meter with a bridge board was used on the downstream side of the catwalk due to a sloping gate chamber floor. When the gates were in the water, measurements of gate openings were made form the "grated gate motor platform" above gates. An average gate opening was obtained by measuring from a horizontal steel plate up to a USGS-maintained reference mark on vertical gate rods at each gate.
Station 02289060 discharge measurements: Current meter measurements with Price AA meters and 10-foot expandable wading rods were made at those bridges having a measurable velocity. Estimates of flow through the outlets having low velocity were made by timing the movement of submerged fine sand particles in the stream. Measuring sections were on the downstream side of all bridges, unless heavy weeds were present.
For the S-12 structures included in Station 02289040 the following data are available: measurement date, upsteam mean gage height (feet), area (square feet), discharge (cubic feet per second), and remarks.
U.S. Department of the Interior, U.S. Geological Survey
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