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Ayman98

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About Ayman98

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  1. Export/Import HEC-HMS elements

    Hello Is it possible to Export/Import HEC-HMS elements from one project to another? Best regards
  2. Lag time for HEC elements

    Hello, When modeling a number of diversions (or other elements) with the same geometry at different locations in the watershed, the HEC-HMS generates the same number of basins with zero values such as the Area, Curve number, Impervious %, .... and Lag time (min). What about the Lag time computation for each Diversion, is it right to set it the same for each diversion? Do I have to calculate it manually using the known Lag time equations? If the diversions have the same geometry, the Lag time will be the same, is this correct? Any clarification will be appreciated on setting the Lag time and its importance and effect on the model calculations. Best regards
  3. Thank you so much Chris for your kind help. Yes, the Add sink is the best option for the case I mentioned in the figure (or injection wells), I need to use a number of sinks at outlet points inside the watershed, but when use Add sink, it gives an error as "Must select the last outlet" which is not what I need. I would like if the Add sink work at any outlet point. Best regards
  4. Lakes and HEC-HMS

    Hello, I mapped lakes polygons over the Drainage coverage, and set the polygon attributes to Lakes, and saved the project as HEC-HMS. The lakes didn't appear on the HEC-HMS project, how to fix that to? Best regards
  5. Hello Is it possible to model injection wells using HEC-HMS (or open pits to direct the runoff water into the groundwater aquifer as illustrated in the figure or any similar structure for artificial recharge that direct the runoff water into the aquifer)? If possible, how to edit that within WMS? Thank you so much
  6. Hello, I am running HEC-HMS model, in the Define precipitation step, when I use the option of: Frequency storm (to edit the values of rainfall during the storm), the model gives the following error on cleaning the mode: No precipitation time series is defined for basin 1B Why it gives that error? where the precipitation is entered in the Define precipitation step. Best regards
  7. Direct and total flow

    Hello When running HEC-HMS, the difference is so big between the direct flow and the total flow; for example direct flow (1000 M3/s) and total flow (30 M3/s), see attached file, is there any explanation for that big difference? Best regards
  8. Hello, Is there tutorials or tips on installing/creating artificial structure in the GSSHA model such as the following: - Artificial ponds/pans - Injection/recharge wells - Storage dams/ boulder dams Best regards
  9. Exporting graphs in HEC-HMS

    Hello, Is there a way of exporting the graphs (results) of HE-HMS? Best regards
  10. Over estimated hydrograph

    Hello I am trying to calibrate a GSSHA model, the hydrograph is over estimated, I calibrated the sensitive parameters even at the minimum or maximum to decrease the discharge and the hydrograph to the observed value or close to it but still over estimated, what else I have to look for? Thanks a lot.
  11. Hello, I am trying to include the evaporation/evapotranspiration in GSSHA, the modeled area only includes about 10% vegetation and the rest of the landuse is dry areas (roads, gravel, open spaces, commercial, urban). My question is what about the paramere values in case of no vegetation, can I put zero (0) or I have to use certain values for vegitation radiation coefficient, canopy stomatal resistance. Is there a standard values/tables for these parameters to have an idea and obtain approximates appropriate for my stuy area (Sinai, Egypt). Also, if I used the evapotranspiration table as shown above, does th model will calculate the evaporation from the soil/land uses during the rain storms? Best regards
  12. GSSHA error message

    Hello, I am trying to run GSSHA but it gives this error and can't run: A non-real overland flow water depth has been detected in cell 411 after applying overland boundary conditions and overland pumping. Why that error and how to fix it? Best regards
  13. The adverse slopes in GSSHA

    Hello, Is there any way to check the adverse slopes instead of the visual inspection as there may be a very small tributary that can't be seen. Best regards
  14. Hello, I am trying to run the GSSHA model, it is initialized and didn't go through, but with the infiltration option off it is working well, what is the problem and how to make it running with the infiltration option on. Best regards
  15. The hydrograph plot

    Hello The hydrograph in the HMS model result is shown as bars not as the known shape of the hydrograph (bell shape or a curve), why is that and how to modify to show the hydrograph? Best regards
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