the included benefits cover three types of ecosystem services changes in flood protection based on avoided property damages changes of the biodiversity of the wetlands based on contingent valuation and the nutrient retention of the additional wetlands based on replacement costs the benefits from these changes of ecosystem services as a result of the program are then compared to the cost of both alternative programs the comparison shows that the dike relocation program is economically advantageous to the polder program if one includes the two additional ecosystem services