Basis of Design Book 2 - City of St. Petersburg

Figure 6-2e. Time Series Plot of Percent Dye Remaining Flushing Run #5
Table 6-1. Flushing Simulations Results
Simulation Date Range
(days)
Percentile Rank of Average
Tidal Energy (%)
Days to 10% Dye
Concentration (days)
October 14-17, 2010 3.7 0.32
October 15-18, 2010 0.7 0.45
October 16-19, 2010 0.5 0.31
October 17-20, 2010 3.3 0.21
October 18-21, 2010 7.4 0.17
Under all of the modeled scenarios, the marina flushes extremely well. Even the lowest energy
cases with the previously stated conservative assumptions being in effect, modeled scenario
runs 2 and 3, performed exceptionally, the marina basin as a whole, flushed in less than 12
hours. Additionally, detailed analysis of the model results show that grid cell (27,74) was the last
individual cell in the marina basin to exceed 10% concentration after 14 hours.
Given the very short flushing times in the proposed marina under conservative model
assumptions and conditions, the hydrographic study demonstrates that under the proposed
marina facility configuration, sufficient flushing will exist to avoid potential water quality issues.
GNV/2012/122381A/8/8/2012
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