Diffuse pollution from agriculture has become increasingly important. The construction of field wetlands provide one group of mitigation options available to farmers. The Mitigation Options for Phosphorus and Sediment Project (MOPS2) was undertaken to make recommendations regarding the design of field wetlands for diffuse pollution control in English landscapes. Ten wetlands were constructed built on four farms. Estimates of annual sediment retention suggest higher trapping rates at sandy sites, compared to silty sites and clay sites. Establishment costs depended more on site specific factors rather than on wetland size or design and would require some form of incentive payment.