Table 4 List of SWAT input parameters and values used for each management practice
Management practice | SWAT input table | Parameters | Parameter description | Value |
|---|---|---|---|---|
Filter strips | Management (.Mgt) | FILTERW | Width of the edge of field filter strips (m) | 30* |
Operations (.Ops) | FILTER_RATIO | Ratio of field area to filter strip area (unitless) | 40 | |
Operations (.Ops) | FILTER_CON | Fraction of the HRU which drains to the most concentrated ten percent of the filters strip area | 0.5 | |
Operations (.Ops) | FILTER_CH | Fraction of the flow within the most concentrated ten percent of the filter strip which is fully channelized (dimensionless) | 0 | |
Grassed waterways | Operations (.Ops) | GWATN | Manning’s “n” value for overland flow | 0.35 |
Operations (.Ops) | GWATL | Grass waterway length (km) | 1000 | |
Operations (.Ops) | GWATW | Average width of grassed waterway (m) | 10* | |
Operations (.Ops) | GWATD | Depth of grassed waterway channel from top of bank to bottom (m) | 1 | |
Operations (.Ops) | GWATS | Average slope of grassed waterway channel | HRU slope × 0.75 | |
Terraces and contour | Operations (.Ops) | TERR_CN | Curve number | 62** |
Operations (.Ops) | TERR_SL | Average slope length (m) | 61*** | |
Operations (.Ops) | CONT_CN | Initial SCS curve number II value | 62** | |
Deep ripper subsoiler | Management (.Mgt) | CNOP | SCS runoff curve number for moisture conditions II | 62** |