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  1. Ekenny_G

    1D No-Rise analysis problems

    No interpolated XS allowed in FEMA model. However, the No-Rise you mentioned is very close. You can play around with adjusting bank stations either up or down to eliminate the small increase.
  2. Ekenny_G

    Hec-Ras- Cliping a large HEC-RAS model to a small specific area

    I'm assuming this is a 1D unsteady flow model, with cross-sections? - First, determine the nearest cross-section upstream and downstream of your area of interest. - Delete all the cross-sections and structures data outside of those areas (to clip the model) - Then use known water surface...
  3. Ekenny_G

    Good morning, I have a proposed su

    The long skinny open channel ponds are an option for such a flat area. However, for the storm sewer have you considered large elliptical pipes (double barrel) and also check that you're not overestimating the loss in the system.
  4. Ekenny_G

    Bioretention Design

    Bioretention are more for providing water quality, not quantity control. There are usually a limit to the drainage area or volume they can handle, like you said something like 6-inches. For quantity control - you would have to consider diverting to a detention pond using a weir or Riser...
  5. Ekenny_G

    Management of Stormwater at Cement Plant with Exposed Ash/Limestone Piles

    I think adding sump or forebays with baffles is a good start. Maintenance is usually an issue as you mentioned.
  6. Ekenny_G

    Scour - house in a floodplain

    Is the FIS flow based on a detail hydrology study or estimated from Regression equation? You can create 2D model with boundary condition that utilize the FIS flow data (Unsteady/steady flow hydrograph),and add breaklines around the house for more detail flow parameter.
  7. Ekenny_G

    HEC-RAS Rain-on-Grid approach vs HEC-HMS

    HEC-RAS Rain on Grid can be a good alternative to HEC-HMS. However, it does require more detail 2D mesh, including if you have any structures like bridges and culvert you want to incorporate. In general, HEC-HMS should be used for hydrology and leave the hydrualic analysis for HEC-RAS. However...
  8. Ekenny_G

    Hydraulic Area - Converting a box culvert to a series of circular culverts

    My recommendation is to use HY-8 to determine existing culvert capacity and Headwater depth. Then using the same HY-8, convert the existing rectangular culvert total opening to an equivalent circular Area. For example: -Determine the total area of the existing box culvert, lets say is a 12ft x...
  9. Ekenny_G

    Error plotting geometric schematic - HECRAS

    Can you just use the full extent?
  10. Ekenny_G

    HEC-RAS 2D DATA IMPORT

    For HEC-RAS 2D, are you asking about Projections to use for your project location (Australia).....? The link you included appears to point to EPSG, which are projection files to assign coordinate systems. For Australia, you will need to know which zone your project is located. Australia has...
  11. Ekenny_G

    HEC-RAS

    I assume you mean HEC-RAS? If so, the HEC Team has put together excellent training resources that you can complete on your own time. This include webcast, tutorial with material, online vidoecast, and many yoututbe videos to go along with it. You may want to check out it at this link from...
  12. Ekenny_G

    HEC-RAS and Dam Breach

    @ Rye1 For Dam breaches in HEC-RAS, you would normally show before breach and after breach inundation map. Then followed by map showing the increase in Depth as a result of the breach wave. Normally, terminate the model where the difference between base and breach wave is less than 1ft or...
  13. Ekenny_G

    HEC-RAS 2D Geotiff Errors

    Check your file path for the geotiff, its too long. Move files to C:// drive.
  14. Ekenny_G

    HEC RAS 2D Boundary and 2D Flow Area not appearing in Unsteady flow viewer

    Usually saving your edits in RASmapper and closing RAS would help. Or close Rasmpper and open the Geometric Editor. Open your Geometry A2_NE and check for the boundary conditions line.
  15. Ekenny_G

    Flatland Detention

    Have you considered using a Siphon system for your pond?
  16. Ekenny_G

    Hydraulic Modeling of a Resevoir into a Closed Conduit system

    Yes, StormCAD should be able to handle modeling stormdrains and inlet sizing including detention ponds. Just need to to setup your Scenarios and layout your pond and piping network. Alternatively, you can use HEC-HMS (free) or HydroCAD (no cost trial version, limited nodes).
  17. Ekenny_G

    HEC-HMS - use hydrograph instead of meteorologic model

    You need to link to that unit hydrograph table in the 'Meteorologic Models' options, select 'Precipitation' and you can select which time-series data you want to use.
  18. Ekenny_G

    Connecting storage area directly to river reach unsteady flow in HECRAS

    Make sure you are running the unsteady flow simulation. What type of Boundary Condition (BC) are you assigning to the River? Post a screenshot of your Unsteady Flow Data to better understand your situation. For Unsteady flow BC, you should have either a Flow Hydrograph, Stage Hydrograph, Normal...
  19. Ekenny_G

    HEC-HMS Modeling For Pond with Pump

    In HEC-HMS, in your "Reservoir" - detention pond, you can add a 'Pump' to your outlet option and set the intake elevation, and 'ON' 'OFF' elevations for your pump. These are the elevations that the pump will be triggered to start and then stop after pumping down. This options requires you have...
  20. Ekenny_G

    determine longest flow path for large basin using ArcGIS

    Have you tried using USGS Streamstats? You may be a able to get Streamstats to get you started, its similar to ArcHydro. Again, it all depends on your outfall location. For such a huge area, the watershed should include a tributary/stream/river....which is likely to be delineated in USGS...

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