The papers included in this volume were part of the 38th IAHR World Congress cited on the cover and title page. Papers were selected and subjected to review by the Editor and the International Scientific Committee and followed a revision process with the following steps: First, several of the committees involved in the organization of the congress established a set of technical criteria for the Committee in charge of the revision. Submitted papers were sent to one or two experts in the field. Authors were then asked to include the necessary amendments and follow the reviewers' comments, and their work was reviewed until the final version was approved by the Editor. In addition to the technical criteria, IAHR publications follow the Ethical Guidelines and Code of Conduct provided by the Committee of Publication Ethics (COPE). A Publication Ethics and a Publication Malpractice statement are publicly available throughout the entire review process.