1. Model Segmentation General Rules

2. Watershed & Water Quality Modeling Technical Support Center Considerations for Segmentation Spatial scale of the problemSpatial scale of the problem –Segment of a water body (e.g., reach, embayment) –Whole water body (e.g., main river, lake, estuary) –Whole river basin network Dimensionality and spatial discretization of segmentsDimensionality and spatial discretization of segments –Box, 1-, 2-, 3-dimensions –Horizontal: tens of meters to tens of kilometers –Vertical: whole water column to tens of centimeters Physical componentsPhysical components –Water column (epilimnion, hypolimnion) –Benthic sediments (surface, subsurface) Model limitationsModel limitations –Maximum # of Segments 3000 –Maximum # of Time Pairs 4000

3. Watershed & Water Quality Modeling Technical Support Center Considerations for Segmentation

4. Watershed & Water Quality Modeling Technical Support Center Considerations for Segmentation Spatial PrecisionSpatial Precision –Model assumption: –Network scale determines how precisely the model will be able to reproduce observed gradients. Instant mixing throughout segment

5. Watershed & Water Quality Modeling Technical Support Center Sampling Stations Point & Nonpoint Sources Sampling Station Water Intake Rivers Lakes & Reservoirs

6. Watershed & Water Quality Modeling Technical Support Center Map of Brandywine Study Area

7. Watershed & Water Quality Modeling Technical Support Center Segmentation of Brandywine River 3 1 4 2 5 8 7 6 12 10 11 9 Reaches: 1.Annuminas 2.Upper Plains 3.Hobbiton 4.Old Forest (monitoring) 5.South Downs 6.Tharbad Ferry 7.Middle Brandywine 8.The Crescent (monitoring) 9.Minhiriath 10.Lake Evendim epilimnion 11.Lake Evendim hypolimnion 12.Shirebourne Marsh

8. Watershed & Water Quality Modeling Technical Support Center Brandywine WASP Network 7.Middle Brandywine 8.The Crescent (monitoring) 9.Minhiriath 10.Lake Evendim epilimnion 11.Lake Evendim hypolimnion 12.Shirebourne Marsh 1.Annuminas 2.Upper Plains 3.Hobbiton 4.Old Forest (monitoring) 5.South Downs 6.Tharbad Ferry

9. Watershed & Water Quality Modeling Technical Support Center Brandywine Physical Geometry

10. Watershed & Water Quality Modeling Technical Support Center Brandywine Simulation Control

11. Watershed & Water Quality Modeling Technical Support Center Brandywine Time Step

12. Watershed & Water Quality Modeling Technical Support Center Brandywine Print Interval

13. Watershed & Water Quality Modeling Technical Support Center Brandywine Network (1) Open Segment tabOpen Segment tab Press Insert to create a segment rowPress Insert to create a segment row

14. Watershed & Water Quality Modeling Technical Support Center Brandywine Network (2) In the supporting spreadsheet:In the supporting spreadsheet: –Highlight river volumes –Copy to clipboard

15. Watershed & Water Quality Modeling Technical Support Center Brandywine Network (3) Highlight Volume fieldHighlight Volume field Paste clipboardPaste clipboard Nine segment rows will be opened with volumesNine segment rows will be opened with volumes

16. Watershed & Water Quality Modeling Technical Support Center Brandywine Network (4) Copy segment names from the spreadsheetCopy segment names from the spreadsheet Highlight first row.Highlight first row. Paste segment names in the Description field, and segment depths in the Depth Multiplier field.Paste segment names in the Description field, and segment depths in the Depth Multiplier field.