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:
- IMPERV - runoff from pervious area flows to impervious area.
- PERV - runoff from impervious flows to pervious area.
- OUTLET - runoff from both areas flows directly to outlet.
|
% 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
- Level 1 assumes that all roof gutters are disconnected from driveways, gutters and Stormwater conveyance elements.
- Level 2 is for developments that already use Level 1 and do not have any curbs and gutters, including concrete swale gutters. All runoff from streets and parking areas is directed as sheet flow across grass surfaces. Intermittent curbs with frequent opening to the grass surface qualifies as Level 2.
|
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 |