Committee of the Whole/Documents/Conceptual Servicing Brief Appendix C: PCSWMM Storm Water Model Output Results
Appendix
Conceptual Servicing Brief Appendix C: PCSWMM Storm Water Model Output Results
December 14, 2021Pages 249–2512 sections
Simulation output charts and tables comparing pre- and post-development storm water runoff and identifying required onsite storage volumes.
2-year storm event required storage: 20.5 m3Post-development runoff without flow control: 10.4 L/s (2-year event)
APPENDIX C
PCSWMM STORM WATER MODEL OUTPUT RESULTS
Page 249–251
2-Year Storm:
Objective Functions for Runoff (m³/s)
From Jun 07, 2021 10:49 PM to Jun 09, 2021 1:11 AM (26.38 hours)
| Statistics | S1 171 Island Highway Post-Development Model | S1 171 Island Highway Pre-Development Model |
|---|---|---|
| Maximum Runoff (m³/s) | 0.01038 | 0.005746 |
| Minimum Runoff (m³/s) | 0 | 0 |
| Mean Runoff (m³/s) | 0.00179 | 0.0012 |
| Duration of Exceedances (h) | 23.98 | 23.98 |
| Duration of Deficits (h) | 0.08333 | 6.017 |
| Number of Exceedances | 1 | 1 |
| Number of Deficits | 1 | 1 |
| Volume of Exceedances (m³) | 154.5 | 103.6 |
| Volume of Deficits (m³) | 0 | 0 |
| Total Runoff (m³) | 154.5 | 103.6 |
Storage Analysis
From Jun 07, 2021 10:49 PM to Jun 09, 2021 1:11 AM (26.38 hours)
- Storage required for: S1 171 Island Highway Post-Development Mode...
- Available storage before outflow: 0 m³
- Maximum design outflow: 0.005746 m³/s
Storage volume required to obtain a peak flow of 0.005746 m³/s at location S1 171 Island Highway Post-Development Model is 20.5 m³.
Subcatchment: S1 Attributes and Results
| Attribute / Parameter | Value |
|---|---|
| Infiltration | |
| Infiltration Method | CURVE_NUMBER |
| Curve Number | 90 |
| Conductivity (mm/h) | 0 |
| Drying Time (days) | 7 |
| Attributes | |
| Name | S1 |
| X-Coordinate | 721.393 |
| Y-Coordinate | 1106.339 |
| Area (ha) | 0.3804 |
| Width (m) | 29.262 |
| Flow Length (m) | 130 |
| Slope (%) | 3.65 |
| Imperv. (%) | 28.76 |
| N Imperv | 0.012 |
| N Perv | 0.15 |
| Dstore Imperv (mm) | 2.5 |
| Dstore Perv (mm) | 5 |
| Zero Imperv (%) | 25 |
| Subarea Routing | PERVIOUS |
| Percent Routed (%) | 100 |
| Curb Length | 0 |
| Results | |
| Precipitation (mm) | 44.9 |
| Runon (mm) | 0 |
| Rain Gage | [RainGage] |
Page 249–251
Extracted from: 2021 12 14 Committee of the Whole Agenda - Agenda - Pdf