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Table 1

Summary of results from GIS analysis of historical Landsat imagery, 1973–2013 (see Figure 1 for locations, Table S1 for detailed measurements within each study grid). DOI: https://doi.org/10.1525/elementa.263.t1

Poldered AreasNatural Areas

 
Year 1973* 2003 2013 1973* 2003 2013 
Length of tidal channels outside of polders (km) 1891 783 782 1964 1987 1981 
Length of tidal channels obstructed by polders [1° creeks] (km) 1108 1108 
Length of tidal channels outside of polders with >50% obstruction [khas land] (km) 355 420 
% change in drainage network   –59%   1% 
% of conduit channels converted to khas land  45% 54%   0% 
Poldered AreasNatural Areas

 
Year 1973* 2003 2013 1973* 2003 2013 
Length of tidal channels outside of polders (km) 1891 783 782 1964 1987 1981 
Length of tidal channels obstructed by polders [1° creeks] (km) 1108 1108 
Length of tidal channels outside of polders with >50% obstruction [khas land] (km) 355 420 
% change in drainage network   –59%   1% 
% of conduit channels converted to khas land  45% 54%   0% 
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