The current guidelines benefitted significantly from a quality enhancement review. We want to thank all those that made this possible: Fatima Arroyo Arroyo, Chris Bennett, John Bryant Collier, Josep de Trincheria Gomez, Xavier Espinet, Brendan Halleman, Kanta Kumari Rigaud, Andrew Losos, Nicolas Peltier, Kulwinder Singh Rao and Joop Stoutjesdijk.
We want to thank many people in many countries for ideas, insights, images and inspiration. With great gratitude: Abraham Abhishek, Khalid A. M. Ahmed, Mohammed Al-Abyad, Khondaker Alinoor, Madiha Kamal Al-Junaid, Michael Anyala, Alemgena Araya, Janeiro Avelino, Alemayehu Ayele, Heinz Bender, Judith de Bruyne, Marlies Batterink, Jelle Beekma, Cecilia Borgia, Robert Bogere, Luwieke Bosma, Annabel Bradbury, Roelof Buffinga, Karen Campbell, Eugenio Cha-verde, Simon Chevalking, Joseph Chibwe, Fiona Collin, Rudolph Cleveringa, Petter Claesson, Flavia S. Cosoveanu, Fernando Dabo, Messay Daniel Tulu, Fabricio del Rio Valdivia, Jonathan Demenge, Lakew Desta, Ivan G. Ebong, Getachew Engdayehu, Letty Fajardo Vera, David R. Fay, Sean Furey, Timmo Gaasbeek, Diego Garcia-Landarte Puertas, Hilary Galiwango, Maheshwor Ghimire, Russell Gilbert, Jorge Giovanhica, Peter Gitonga, Dr. Berhane Grum, A. M. Aminul Haque, Ibnul Hasan, Nicholas Hawkins, David Hirsch, Jesper Hornberg, Imran Hossain Newton, Nagaraja Rao Harshadeep, Motaher Hossain, Sk. Nurul Islam, Jahidul Islam, Nancy Kadenyi, Bizuneh Kebede, Theophilus M. Kioko, Haftu Kiros, Lenneke Knoop, Julia Komagaeva, Matthijs Kool, Ashok Kumar, Raquel Lauge, James Leather, Cleophas N. Makau, Rowshan Mamtaz, Kebede Manjur, Eng. Benson Masila, Nathaniel Matthews, Abraham Mehari, Shomik Raj Mehndiratta, Derbachew Mezgeb, Bakhodir Mirzaev, Nicholas Mulenga, Charles Mutemo, Jackson W. Muthini, Charles M. Mutuku, Leonard Mutuku, Fred Mwango, Mauricio Navarro, Linda Navis, Erik Nissen-Petersen, Rubina Normahomed, MacPherson Nthara, Lewis W. Nzuki, Godfrey Obura, Elcidio Paruque, Sanmugam A. Prathapar, Framl Radstake, Sadmina Razzaque, Belmiro Rodolfo, Karin Roelofs, Marco Antonio Rodriguez, Deruo Roia, Mark Henry Rubarenzya, Abul Fazal M. Saleh, Sharafaddin A. A. Saleh, Francesco Sambalino, Sundie Silwimba, Irene Simoes, Anika Tahsin, Eulio Tebe, Simon Thuo, Stephen Twomlow, Aksakolov Ukumatsho, Gulkhumor Ukumatshoeva, Marco Vaz dos Anjos, Simone Verkaart, Rodrigo Villegas, Amdom Weldu, Daniel Wiegant, Geoffrey Wilson, Saroj Yakami, Karma Yangzom.
Dedication to Ian Neal, who is no longer with us in person, yet in spirit is. Ian catalysed much of the early thinking on ‘roads for water’.