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  1. pinkpig

    Rational Method and Time of Concentration

    drainage area bigger, the ToC will be greater and the Intensity will be smaller. The assumption here is a larger area is hard to get a uniformly distributed rainfall at a higher intensity.
  2. pinkpig

    Hi everyone, Please,I have a que

    water is kind of incompressible and the volume change (increase here) from 200kpa to 100kpa is small. So you can calculate the volume increased according to water phase diagram which is a very very small number I would assume.
  3. pinkpig

    Existing roadway sheet flow and profile (HGL) calculation

    Without using 2D modeling, what’s the best way to calculate an existing roadway sheet flow profile (HGL along roadway) under different return period storms? Suppose the roadway has subsurface storm sewer as well as roadside drainage ditches. Thanks.
  4. pinkpig

    dual drainage model in swmm

    Your question is too broad. What kind of dual drainage system you want to mode – for example, do you really want to model each inlet opening as a weir/orifice or just a simply manhole without flow restriction? Your budget and time? Modeling a dual drainage system in EPA SWMM is very time...
  5. pinkpig

    WIN TR-55 and HEC-HMS

    They will generate small difference suppose you use same CN, TC, rainfall,... but I don't see why they did not use HEC-HMS for pre if the purpose is to compare the two conditions.
  6. pinkpig

    Best stormwater modeling software for small-medium size project

    HydroCAD is good and able to handle a lot of situation. also consider HEC-HMS and SWMM and HEC-RAS.
  7. pinkpig

    Sand filter sand

    sand filter/fabric filter or the combination is to retain underlying soil from being washed out and at the same time to allow water release to ground. The filter needs to be designed to meet the grading requirements (FHWA, USACE, or NRCS has such criteria) and sometimes you need multiple layers...
  8. pinkpig

    How to model depressional area in HEC-HMS

    Method 2 seems kind of double dipping the impact and that's why you got a lower discharge. I would go with method 1,and also make sure since you are modeling the depression as reservoir, when you calculate your basin hydrological parameters, don't include any factors from the reservoir.
  9. pinkpig

    does water lose from HEC-RAS 5.0x 2D flow area?

    In HEC-RAS 2D modeling,will water get lost from 2D flow areas? or water will build up against an imaginary wall at 2D area boundaries (similar behavior happen at HEC-RAS 1D cross section limits)?
  10. pinkpig

    HEC-RAS modeling excessively long culverts

    is the model under steady state or unsteady?
  11. pinkpig

    unsteady HEC-RAS using flow hydrograph from HMS as B.C.

    How do we set up flows from HMS (via HEC-DSS) for use in HEC-RAS? I am talking internal boundary conditions - there are two options in HEC-RAS, namely uniform flow and lateral flow. If I have subbasin say "A" and the river in HEC-RAS runs through its center. Should I introduce A flow by HMS...
  12. pinkpig

    Need recommendations on ArcGIS (ArcMAP) training courses for H&H engineers

    Need recommendations for good ArcGIS training courses for H&H engineers, but beginner for GIS. Thanks.
  13. pinkpig

    INFLOW hydrograph?

    at least you need to learn HEC-HMS first. read the manual it is not that difficult.
  14. pinkpig

    EPASWMM

    You need to figure out how to model hydrology in SWMM 1. use SWMM hydrology to general hydrograph (It is basically a non linear reservoir routing method); 2. develop hydrograph outside of SWMM and introduce them at nodes as external flows; Also, you need to understand that SWMM is a dynamic...
  15. pinkpig

    difference among engineering fill, select fill, structural fill, and general fill?

    thanks for clarifications. So, to me, all these terms are not strictly defined, one person's select fill could be another one's engineering fill, or structural fill.
  16. pinkpig

    HEC-HMS time series data manager

    try version 4.1, the newest one.thanks.
  17. pinkpig

    difference among engineering fill, select fill, structural fill, and general fill?

    1. can anyone explain to me the difference among engineering fill, select fill, structural fill, and general fill? 2. And for a berm of a dry detention pond, what type of fill is appropriate and material type - sand, clay, silt, or in terms of PI? 3. For backfill of a storm sewer pipe under...
  18. pinkpig

    HEC-HMS time series data manager

    which version of HMS? I am using the newest version and do not have such an issue.
  19. pinkpig

    Storm sewer system draining into a detention basin

    if local government review agency allows, it seems it is just easier to model the whole thing in a dynamic model which consists of storm sewer, pond, street (as major a drainage system for spread analysis), inlets (model it as weir and/or orifice).
  20. pinkpig

    hydraulics design on relief bridge

    Any hydraulic design criteria on a relief bridge? like low chord setting, or relief bridge low chord EL. relationship with main channel bridge? Thanks.

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