DP2015 contained an initial indication of the costs of the Delta Programme up to and including 2050. The taskings have been estimated at approx. 20 billion euros + PM; by far the largest proportion of this sum pertains to investments in flood risk management. The PM item in the cost estimate consisted of a non-specific reserve for other projects, additional management and maintenance costs ensuing from increased acreage and risks. Based on further analyses, the risk reserve in DP2016 has been raised by 5 billion euros; the anticipated costs item has been raised by some 1 billion euros. The implementation of the Delta Programme up to and including 2050 is thus costed at 26 billion euros +/- 50%, a realistic bandwidth at this stage of the programme (see DP2016). This estimate still holds good. The cost estimate for the implementation of the Delta Programme will be revised following the adoption of the long-term ambition for the Rivers.