Download presentation
Presentation is loading. Please wait.
Published bySilvester Perry Modified over 9 years ago
1
Patapsco and Back River HSPF Watershed Model Part II – Water Quality Maryland Department of the Environment
2
Introduction Water Quality Data Model Inputs Calibration Procedure Model Comparisons Summary
3
Water Quality Data Data Sources Department of Natural Resources Monthly values for NH3, NO3, TN, PO4, TP, TOC, DO, TSS, Temperature Baltimore City* Storm event and base flow values for TSS, TOC, TN and TP * City of Baltimore Comprehensive Wastewater Facilities Master Planning Project
5
Model Inputs Atmospheric Deposition Septic Loads Point Sources Manure and Application
6
Atmospheric Deposition Deposition is input as NO3 (wet and dry) and NH3 Used CBP time series Avg. Annual NO3 7.05 lb/acre Avg. Annual NH3 2.08 lb/acre
7
Septic Loads Number of septic users were calculated on County basis using Census data compiled by EPA. Used GIS to allocate to watershed segmentation Assume NO3 loading coefficient of 0.0256 lb/person/day. Assume 60% reduction in NO3 Assume 100% retention of Phosphorus
8
Manure and Application Animal Counts – Used to calculate Manure Acres which is simulated as an impervious land use Manure acres is a derived land use which represents what is susceptible to runoff from confined animals within a model segment.
9
Manure/Mineral Fertilizer Application Manure Calculations (based on MDA and U of MD recommendations)
10
Calibration Procedure Focus on predominant land uses Calibrate EOS loads to literature values Calibrate urban loads to Event Mean Concentrations (EMCs) Time series overlay
11
Unit Loading Rates (Literature Values) Literature Sources: Jones Falls Water Quality Management Plan, Loch Raven Water Quality Management Plan, Baltimore County NPDES 2000, Harford County NPDES 1999 and 2000, City of Baltimore NPDES 1999, Center for Watershed Protection and Ken Staver (University of MD).
12
Patapsco/Back Estimated Average Annual Loads and Percent Contributions Load = Loading Rate x Area
13
Estimated and Final Model EOS Loads
14
Urban EMCs
17
Jones Falls Water Quality Calibration Calibration at Station JON0184 Parameters calibrated: DO, Temperature, TOC, TSS, PO4, TP, NH3, NO3, ChlA and TN
25
Patapsco (Hollofield) Branch Water Quality Calibration Calibration at Station PAT0285 Parameters calibrated: DO, Temperature, TOC, TSS, PO4, TP, NH3, NO3, ChlA and TN
33
Summary/Comparisons Unit loads, EOS and Delivered loads compared to existing studies Discussion of model loads and comparison
34
Comparison of Unit Loading Rates
35
Total Average Annual EOS Loads Summary
36
Total Delivered Loads Summary
37
Back River Comparisons
38
Comparison of CBP and MDE Model Model Scale Hydrology Calibration Water Quality Calibration Urban Calibration
39
CBP Segmentation
40
MDE Segmentation
41
Hydrology Calibration
42
Water Quality Calibration
43
Urban Calibration NPDES Storm Water Data vs. National Urban Runoff Program (NURP) Data CBP reductions to Urban Loads - Reductions to Urban Loads of 15% TN and 30% TP* * Based on numbers from Urban Watershed Group
44
Summary MDE hydrology calibrated to 3 gages. CBP model hydrology calibrated to 1 gage. MDE water quality calibrated to 4 gages. CBP model water quality calibrated to 1 gage. MDE urban land use calibrated to local NPDES data. CBP calibrated to NURP data. It can be concluded that the final load differences between the MDE and CBP models are due to these factors.
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.