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Table 4 List of SWAT input parameters and values used for each management practice

From: The impact of future climate and land use/cover change on water resources in the Ndembera watershed and their mitigation and adaptation strategies

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**
  1. * User defined value based on knowledge from the field. ** Adopted from Table 20-1 of runoff curve numbers for cultivated agricultural lands (Arnold et al. 2013). *** Values from the calibrated SWAT model. Other values without the asterisk (*) were default values from the SWAT database