Subcatchment Hydrological (Modeling) – Data Table
This table contains all subwatershed data that is used to estimate the amount of runoff and pollutant yielding from Subwatersheds. For more information on each of the input (data fields) in this table, Subcatchment editor may be referred. The following table is in invert colors and shows the whole first row of the DB Table on separate rows in the image.
| Field | Description |
| Subcatchment ID | User determined ID. It can only be changed with the Change ID command. |
| Raingage ID | Specify Raingage ID used to input rainfall data to Subcatchment. |
| Receiving Node ID | Node ID for node receiving rainfall hydrograph from Subcatchment. |
| Subcatchment Area | Area of Subcatchment |
| Subcatchment Impervious (%) | Percentage of the Subcatchment covered by impervious surfaces. |
| Subcatchment Width | Characteristic width of the Subcatchment (feet or meters). |
| Subcatchment Slope | (%) Slope of the Subcatchment. |
| Subcatchment Curb Length | Total length of curbs in the Subcatchment (any length units). Used only when pollutant buildup is normalized to curb length. |
| Snow Pack ID | Name of snow pack parameter set (if any) assigned to the Subcatchment. |
| Manning’s N for Imperv. Portion | Manning’s N for overland flow over the impervious portion of the Subcatchment. |
| Manning’s N for Pervious Portion | Manning’s N for overland flow over the pervious portion of the Subcatchment. |
| Depression Stor. for Imp. Portion | Depth of depression storage on the impervious portion of the Subcatchment (inches or millimeters) |
| Depression Stor. for Perv. Portion | Depth of depression storage on the pervious portion of the Subcatchment (inches or millimeters). |
| % of Imperv. Part w/o Dep. Stor. | Percent of the impervious area with no depression storage. |
| Runoff Routing Destination | Choice of internal routing of runoff between pervious and impervious areas:
|
| % of Runoff Routed to Destination | Percent of runoff routed between subareas. |
| LENGTH | Characteristic length of the Subcatchment (feet or meters). |
| CNTRD_DIST | Distance from centroid of Subcatchment to outlet (feet or meters). |
| NRCS_CN | NRCS Curve Number |
| DCIA_LEVEL | Directly Connected Impervious Area Level for CUHP method
|
| CIA_RATIO | Fraction of the impervious area that is directly connected to the drainage system. |
| RPA_RATIO | Fraction of the pervious area that receives runoff from pervious area and unconnected impervious area. |
| TC | Time of concentration (minutes). |
| WQCV | Water Quality Capture Volume (watershed inches or millimeters). |
| WQCV_TIME | The time it takes to fully drain the brim-full WQCV |
| Runoff Coefficient | SDMRH only. (Note – There is a different Runoff Coefficient reported in HYDQUA.RPT. It is the total runoff from the Subcatchment divided by the total rainfall over the Subcatchment. It should always be between 0 and 1.) |
| Storage Coefficient | Snyder UH and Clark UH. Represents storage effects of the watershed. |
| Empirical Coefficient | Snyder UH only. |
| Conveyance Factor | Espey UH only |
| Infiltration Model | Use this to use a different infiltration model than the default model set in Simulation Options. |
| Depression Storage | Average depth of depression storage across the Subcatchment. Can be used in NRCS methods to indicate Initial Abstraction (Ia). |
| Storage Coefficient | Storage Coefficient for German Runoff |
| Reservoir Count | Reservoir Count for German Runoff |
Rules and Ranges the for Hydrology Options
| Innovyze Hydrology Type Data Ranges and Default | |||||
| Hydrology Type | Data Type | User Unit | Internal Unit | Valid Internal Range | Default Internal Values |
| rain-depth | |||||
| Colorado UH | in or mm | ||||
| DCIA level | enumerator | 1, 2, 3 | 1 | ||
| hydraulic length | double | ft or m | ft | >= 1 | 50 |
| centroid distance | double | ft or m | ft | >= 0 | 0 |
| DCIA fraction | double | 0 <= & <= 1 | 0.2 | ||
| RPA fraction | double | 0 <= & <= 1 | 0.75 | ||
| time of concentration | double | minutes | seconds | >= 1 | 60 |
| captured volume | double | rain-depth | ft | >= 0 | 0 |
| Drainage time | double | hours | seconds | >= 0 | 12 |
| NRCS/Delmarva | |||||
| Curve Number | double | 40 <= & <= 100 | 75 | ||
| hydraulic length | double | ft or m | ft | >= 1 | 50 |
| time of concentration | double | minutes | seconds | >= 1 | 60 |
| depression storage | double | rain-depth | ft | >= 0 | 0 |
| Snyder UH | |||||
| storage coefficient | double | 0.1 <= & <= 8 | 2 | ||
| empirical coefficient | double | 0.1 <= & <= 1.0 | 0.5 | ||
| hydraulic length | double | ft or m | ft | >= 1 | 50 |
| centroid distance | double | ft or m | ft | >= 0 | 0 |
| depression storage | double | rain-depth | ft | >= 0 | 0 |
| Clark UH | |||||
| storage coefficient | double | 0.1 <= & <= 10 | 1 | ||
| time of concentration | double | minutes | seconds | >= 1 | 60 |
| depression storage | double | rain-depth | ft | >= 0 | 0 |
| Santa Barbara | |||||
| time of concentration | double | minutes | seconds | >= 1 | 60 |
| depression storage | double | rain-depth | ft | >= 0 | 0 |
| Espey UH | |||||
| hydraulic length | double | ft or m | ft | >= 1 | 50 |
| conveyance factor | double | 0.6 <= & <= 1.3 | 1 | ||
| depression storage | double | rain-depth | ft | >= 0 | 0 |
| Modified Rational | |||||
| time of concentration | double | minutes | minutes | >= 1 | 5 |
| runoff coefficient | double | 0 <= & <= 1 | 0.5 | ||
| storm duration | double | factor | factor | TC: > 0 | 1 |
| hours | hours | Dur: >= 0 | |||
| San Diego Rational | |||||
| runoff coefficient | double | 0 <= & <= 1 | 0.5 | ||
| time of concentration | double | minutes | minutes | >= 1 | 0.75 |
| German Runoff | |||||
| Storage constant | double | minutes | minutes | > 0 | 5 |
| Reservoir count | integer | > 0 | 1 | ||
Categories: #INFOSWMM, InfoSWMM, InfoSWMM_SA