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Discover Some of the Many Advantages and Benefits of H2OMAP SWMM for ArcGIS:

General Capabilities
Ability to use background layers

(BMP, DXF, DGN, DWG, SHP, MI, AI Coverages, Tiffs, Geodatabases, etc.)
Zoom and pan
Named views
Network overview
Coordinate scaling
Support different element sizes and line widths
Support copy and paste to and from the clipboard
Search for specific nodes and links
Data-entry error checking
Record keeping and tracking model changes
Multiple database queries
Variable time step
Real-time controls
Calibration
Dynamic display
Error detection and consistency checks
Simulation progress bar
Evaluate loop systems
Multiple/batch runs
Compare multiple scenario results
Pre-steady state run
Interface to external runoff and routing files
Save results in the EPA standard binary data format
User defined attributes for any modeling object
Block-edit ALL modeling data
Support for Radar Rainfall formats from OneRain, Vieux, and NOAA NEXRAD
Scenario Management - All in the same Model
      Model unique facilities (Existing, 2015, 2025, etc.)
      Change any parameter or data
      Data changes may be applied to all scenarios
      Compare multiple scenario results on one graph
Model street overland flows
Model dual drainage
Catch Basin Multiplier
Hydraulics
Irregular pipe sections
Simulate transverse weir
Simulate side flow weir
Simulate V-notch weir
Simulate trapezoidal weir
Simulate any type of weir
Simulate constant and variable speed pumps
Simulate manifold pump system
Simulate orifices
Simulate gates
Simulate the filling and draining of a storage facility
Size a storage facility
Simulate a leaping weir
Simulate a hydrobrake
Flow routing equations
H2OMAP SWMM is a discrete time simulation model that uses the powerful semi-implicit dynamic solution scheme (more accurate than implicit schemes and more stable/robust than explicit schemes) of the full St. Venant equations enhanced with the method of successive approximation with under-relaxation, and a variable time step based on Courant stability criterion. This rigorous and very accurate hybrid method is now the USEPA standard and FEMA certified.
Steady state routing
Kinematic wave routing
Dynamic wave routing
Use individual or global hydraulic parameters
Simulate surcharging
Model backwater effects
Model flow reversal
Model pressurized flow
Account for minor losses
Analyze complex bypasses and outfalls
Model advserse pipes
Evaluate changes in flow conditions (supercritical to subcritical) within consecutive pipe segments (e.g., a slope change from 0.5% to 8%)
Evaluate conditions with drop manholes, junctions, pumps, orifices, etc. showing an accurate representation of the HGL
Simulate tidal gates
Capability of a ‘hot start’ to begin a simulation at a specific point in the analysis
Evaluate siphons, low flow-diversions, reverse flows, pressure flow, and outfalls
Flow reversal correctly computed for any object including culverts
Flap gate available in any conduit/weir/orifice/outlet
Split network by routing type
Identify cause of flooding as backwater or capacity
Solutions with SWMM supercede HEC culvert equations
Analyze sediment impacts
Load system (flow and/or water quality) with:
     subcatchment hydrology,
     groundwater,
     external timeseries,
     dry-weather flow, or
     rainfall-derived inflow and infiltration (RDII as RTK unit hydrograph)
Variable Time Step simulations optimize simulation runtime for accuracy and speed
Efficient long-term wet-weather flow simulation
Modulated controls for pumps, weirs, orifices
Hydrology/Flow Generation
Use the Soil Conservation Service (SCS) method of generating runoff
Use the Tri-triangular unit hydrograph
Use Colorado Urban Hydrograph Procedure (CUHP)
Use NRCS Dimensionless Unit Hydrograph
Use NRCS Triangular Unit Hydrograph
Multiple diurnal flow patterns for sanitary flows
Model Infiltration/Inflow
Model snow accumulation and snowmelt
Model time-varying rainfall
Model evaporation of standing surface water
Account for wind speed and temperature
Model rainfall interception from depression storage
Model infiltration of rainfall into unsaturated soil layers
Model percolation of infiltrated water into groundwater layers
Model interflow between groundwater and the drainage
Model nonlinear reservoir routing of overland flow
Consider antecedent moisture conditions
Allows irregular interval rainfall timeseries
Import weather timeseries in NCDC TD-3200 format
Model snowplowing and street sweeping hydraulics and water quality impacts