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      "context_excerpt": "wet pond is 90%; to achieve this TSS removal rate, the system must be designed with 24-hours of extended detention and a 3:1 ratio of permanent pool volume to the volume of stormwater generated by the WQDS.\n\n[OCR image]\n\nThe following example illustrates how to use the chart to determine the TSS removal rate provided.",
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      "context_excerpt": "ides. Design #1 provides no extended detention; therefore, the lowest curve is used to determine the TSS removal rate. Designs #2 and 3 provide extended detention and therefore, use the upper set of curves.\n\n[OCR image]",
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      "context_excerpt": "Step 3: For each of the designs, at the intersection of the vertical line from Step 2 with the respective curve, draw a horizontal line from right to left over to the y-axis to get the TSS removal rate.\n\n[OCR image]\n\nThe resulting percent TSS Removal Rates appear in the last column of the table below.\n\n|  Design Number | Permanent Pool Volume (ac-ft) | WQ Runoff Volume | Extended Detention Period |   |   | Ratio of Permanent Pool to WQ Runoff | % TSS Removal  |\n| --- | --- | --- | --- | --- | --- | --- | --- |\n|   |   |   |  12 Hr | 18 Hr | 24 Hr  |   |   |\n|  1 | 1.246 | 1.246 | - | - | - | 1.0 | 50%  |\n|  2 | 2.7",
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