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Patapsco/Back River SWMM Model

Patapsco/Back River SWMM Model. Part I - Hydrology Maryland Department of the Environment. Patapsco/Back River Watershed. Storm Water Management Model SWMM. Selection Criteria Primarily Urban Runoff Model (wet weather flow) Existing studies available

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Patapsco/Back River SWMM Model

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  1. Patapsco/Back River SWMM Model Part I - Hydrology Maryland Department of the Environment

  2. Patapsco/Back River Watershed

  3. Storm Water Management ModelSWMM Selection Criteria • Primarily Urban Runoff Model (wet weather flow) • Existing studies available • Existing parameterization information available • Multiple Buildup/Washoff Functions • Limited parameters • Stakeholder involvement • Credibility (EPA)

  4. Rainfall Hourly Runoff Urban/Non-Urban Infiltration (Horton) Buildup/Wash off USLE Transport Point Source Baseflow Postprocessing Temporal Load Event Mean Concentration SWMM Blocks

  5. Hydrology Calibration Methodology • Parameterization • Linked to topographic/physiographic information • Physically based • Flow Comparison • Daily Cumulative • Daily Frequency • Monthly • Seasonal • Annual • Analysis • Statistical Error • Correlation

  6. Land use • Maryland Office of Planning (1997) • Farm Services Agency and • Agricultural Census Data

  7. Land Use Aggregation

  8. SWMM/HSPF Model Segmentation

  9. Soils • Soil Data Sources • BCI – SSURGO • BCO - County GIS • AA – Ragan • Carroll – Ragan • Howard - Ragan

  10. Channel X-Section • Jones Falls • Overbank extracted from DEM • Main Section From Surveyed Channel Info

  11. X-Section Editing for SWMM

  12. Stations (2) Advantages Quality of Data Reduces averaging of rainfall intensity Disadvantages Minimal spatial variability of rainfall Edits for year 2001 Precipitation • Meteorological data obtained from CBP Watershed Model (Region V)

  13. 10 USGS Gauges for Analysis (1/1/92 – 9/30/01) Complete Time Series (5 Gauges) Partial Time Series (5 Gauges) 1992 – 1996 (regression) 1996 – 2001 Baseflow Separation (USGS HYDSEP) Normalize Baseflow by Area SWMM Baseflow Methodology

  14. SWMM Wet Weather Flow Comparison

  15. USGS Calibration Stations

  16. Patapsco/Back River Hydrology Calibration • Jones Falls (HSPF / SWMM) • Gwynns Falls (HSPF / SWMM) • Patapsco River (HSPF / SWMM / CBP) • Back River (SWMM)

  17. Jones Falls Hydrology Calibration

  18. Gwynns Falls Hydrology Calibration

  19. Patapsco River Hydrology Calibration

  20. Back River Hydrology Calibration

  21. Hydrology Calibration Monthly Statistical Summary * Simulation End Date 12/31/98

  22. Hydrology Calibration Annual Statistical Summary * Simulation End Date 12/31/98

  23. HSPF/SWMM Calibration Summary & Conclusions • Reasonable error and correlation with gauge data • Models support overall trends of monthly, season and annual flows

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