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Inlet type and Grating

Hello,

  1. What would be the difference between a catch basin set to "In Sag" "Inlet Location" with
    1. "Inlet Type" set to Percent Capture & set to 100 for "Capture Efficiency" 
    2. "Inlet Type" set to "Full Capture"
  2. If using one of the catch basins defined above what grating information is used for a "Structure Type" set to "Circular Structure"?

thanks

KP

Parents
  • Hello Kanwarpreet,

    An "In Sag" inlet captures 100% of the flow since "In Sag" inlets are generally located at depressions in the topography (Slope < 0 or negative gradient).

    For both the conditions that you have specified i.e. percent capture 100% and full capture the inlet will capture the entire runoff from the catchment or the flow directed to it. See the below article for more details on inlets "In Sag";

    Depth and spread calculations for grate inlet in sag

    The grating information depends on how you want your inlet to function. For a catch-basin, the "width" and "length" fields inside the inlet catalog affect the structure losses hydraulically, when using the HEC-22 2nd edition headloss method. However, the structure "width" and "length" represent the dimensions of the vault where the inlet is housed. These values are only for reference and are not used in calculations. See the article below for more clarity on this;

    What do the different "width" and "length" fields represent, for a catalog inlet?

    Hope this helps.


    Regards,

    Yashodhan Joshi

Reply
  • Hello Kanwarpreet,

    An "In Sag" inlet captures 100% of the flow since "In Sag" inlets are generally located at depressions in the topography (Slope < 0 or negative gradient).

    For both the conditions that you have specified i.e. percent capture 100% and full capture the inlet will capture the entire runoff from the catchment or the flow directed to it. See the below article for more details on inlets "In Sag";

    Depth and spread calculations for grate inlet in sag

    The grating information depends on how you want your inlet to function. For a catch-basin, the "width" and "length" fields inside the inlet catalog affect the structure losses hydraulically, when using the HEC-22 2nd edition headloss method. However, the structure "width" and "length" represent the dimensions of the vault where the inlet is housed. These values are only for reference and are not used in calculations. See the article below for more clarity on this;

    What do the different "width" and "length" fields represent, for a catalog inlet?

    Hope this helps.


    Regards,

    Yashodhan Joshi

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