Last advice

On October 18th, 1955, the fourth and last piece of advice was given. This advice included an extensive specification of the Deltaplan, detailing the advantages and disadvantages and an overview of the costs. The Deltacommission believed that the Deltaplan could be carried out in 25 years and cost approximately 1.5 to 2 billion guilders (today about 680 to 900 million euros).
The plan was commuted into a bill and on November 16th, 1955, the bill was sent to the Dutch Lower House. More than two years later, the law was enacted and, on May 8th, 1958, the Delta-law was signed by the Queen herself.