| Features & Capabilities |
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| Hydrology Modeling Capabilities |
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1. |
EPA SWMM v5.0 |
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2. |
Importing XPSWMM™ v10.52 and earlier models |
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3. |
Importing EPA SWMM v4.4 and earlier models
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4. |
Exporting XPSWMM models
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5. |
NRCS (SCS) TR-55
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6. |
NRCS (SCS) TR-20
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7. |
US Army Corps of Engineers HEC-1
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8. |
Rational Method
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9. |
Modified Rational Method
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10. |
DeKalb Rational Method
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11. |
Santa Barbara Unit Hydrograph Method
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12. |
Maricopa & Pima Counties (Arizona) Papadakis-Kazan Methodology |
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13. |
Harris County (Texas) Methodology
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14. |
LA County MODRAT2 and F0601
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15. |
CUHP Colorado Urban Hydrograph Procedure
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16. |
WWHM Western Washington Hydrology Model
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17. |
HEC-HMS
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18. |
Sacramento County Method
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19. |
Automatic composite SCS curve number computation based upon land use and soil groups
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20. |
Automatic composite runoff coefficient computation based upon land use and soil groups
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21. |
Automatic SCS TOC computation
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22. |
Delmarva Unit Hydrograph
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23. |
Adjust hydrograph shape factor, select from pre-defined shape factors or assign user-defined shape factor
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24. |
Long-term continuous simulation
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25. |
Dry weather flow (DWF), rainfall derived inflow and infiltration (RDII), direct inflow and/or rainfall-runoff modeling
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26. |
Water quality pollutant modeling (land-use based build-up and wash-off, including treatment)
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27. |
Snow accumulation and melting
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28. |
Rainfall interception from depression storage
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29. |
Interflow between groundwater and surface drainage
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30. |
Antecedent moisture condition accounting
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Time of Concentration Methods |
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31. |
Carter
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32. |
Eagleson
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33. |
Kirpich
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34. |
FAA
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35. |
Papadakis-Kazan
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36. |
SCS TR-55
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37. |
User-defined
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Rational Method IDF Capabilities |
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38. |
IDF table (direct entry of values for different return periods)
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39. |
BDE method
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40. |
Polynomial method
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41. |
Direct intensity entry
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42. |
Library support of IDF data
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1/2 |
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Design Storms |
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43. |
Automated Rainfall Designer
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1/2 |
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44. |
USA and Canadian Design Storms
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1/2 |
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45. |
Rainfall for entire USA at county and metro region level
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Hydraulic Modeling Capabilities |
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46. |
Subcritical, critical, and supercritical flow regimes
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47. |
Gravity and pressurized (surcharged) flow
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48. |
Flow reversals
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49. |
Dual drainage (major/minor) system modeling, including dynamic interaction (i.e., stormwater sewer network and city streets as separate but connected conveyance pathways)
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1/2 |
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50. |
Flow splits and combines
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51. |
Branched, dendritic, and looped systems
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52. |
Tailwater submergence & backwater effects
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1/2 |
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53. |
Interconnected storage structures
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54. |
Kinematic wave routing
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55. |
St. Venant hydrodynamic routing
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56. |
Open (natural) channels and sewer pipes
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57. |
Account for various head losses, including entrance losses, exit losses, friction losses, bend losses, and drop losses
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58. |
Accounts for storm sewers and sanitary sewers, open channels, streams, bridge and culverts, curb and gutter inlets, detention ponds and outlet structures, flooding overflows
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1/2 |
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59. |
Model valves, inflatable rubber dams, bendable weirs, and other complex flow control structures
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60. |
Continuous and/or single event modeling
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61. |
Irregular shaped pipes and culverts
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62. |
Transverse weir simulations
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63. |
Side flow weir simulations
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64. |
Account for minor losses
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65. |
Complex bypass and outfall analysis
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66. |
Adverse sloped pipes and channels
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Detention Ponds |
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67. |
Automatically compares pre- and post-developed hydrology conditions
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68. |
Computes storage volume required to meet peak flow reduction objectives
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69. |
Pond infiltration (exfiltration) support
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70. |
Handles single pond, multiple ponds, and interconnected ponds
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1/2 |
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71. |
Handles variable tailwater conditions, including tailwater submergence effects
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72. |
Models ponds with multiple outlets and flow diversions
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73. |
Pond defined by area or volume
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74. |
Surface evaporation
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Other Storage Structures |
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75. |
Retention facility (wet ponds & infiltration basins)
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76. |
Extended detention wet ponds
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77. |
Extended detention dry ponds
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78. |
On-site, underground stormwater retention/detention
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79. |
Shallow marshes & constructed wetlands
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80. |
Bioswales & rain gardens
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81. |
Underground large diameter interconnected storage pipes and arched pipes
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82. |
Database of standard underground storage chambers from leading manufacturers
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Highway Drainage Capabilities |
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83. |
Interconnected curb and gutter storm drain inlets
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1/2 |
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84. |
US Federal Highway Administration (FHWA) HEC-22 computations included
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85. |
Account for on sag and on grade conditions
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86. |
Compute gutter spread, depth of flow, inlet efficiency, inlet spacing, velocity of flow
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87. |
Model dual conveyance pathways (storm sewer and curb-gutter flow)
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88. |
Database of standard curb openings and grated inlets from major manufacturers and municipalities
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89. |
Agency-ready drainage reports
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Water Quality Capabilities |
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90. |
Account for rain gardens, green roofs, rain barrels, bioswales, dry detention ponds, wet ponds, retention ponds, wetlands, and more
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91. |
Model particulate settling, water cleanup, water quality best management practices (BMP), and TMDL (Total Maximum Daily Loads)
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92. |
Can incorporate best management practices (BMP) directly within the model
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1/2 |
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93. |
Dry-weather pollutant buildup over different land uses
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94. |
Direct contribution of rainfall deposition
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95. |
Pollutant washoff from specific land uses during storm events
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96. |
Reduction in dry-weather buildup due to street cleaning
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97. |
Reduction in washoff load due to BMPs
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98. |
Entry of dry weather sanitary flows and user-specified external inflows at any point in the drainage system
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