The organization of ancient water control and irrigation has been a matter of debate in particular with regard to the role of the state. More often than not a deeply centralized management is assumed, especially for large‐scale water control and irrigation systems, despite the lack of empirical evidence. Such assumptions are frequently based on the perception that irrigation and water control requires a massive (though often unquantified) amount of capital investment, labor, and a level of coordination and cooperation which could only be provided and enforced by a central authority. Given that most early civilizations, in particular of the Old World developed in river valleys, allegedly supported such notions of a close correlation between water management and socio‐political complexity. More recently, claims about heavy state involvement in ancient irrigation and water management has been called into question, often however without being able to provide evidence for alternative explanations. Reason being that for most relevant cases we lack the necessary empirical evidence to measure the level of state involvement in the management of water and irrigation. The major exception is Mesopotamia with its exceptionally rich archeological and textual record on ancient water control which allows for a more nuanced understanding of the actual role of ancient states in the organization of irrigation and water management. This article reviews this evidence from the sixth till the first millennium B.C. and shows that state involvement in the organization of irrigation and water control within the same environmental context varied considerably over the course of several millennia. I argue for a close correlation between the level of state involvement in irrigation and water management and the way arable land was exploited by state institutions. In addition, I argue that environmental changes at times warranted state interventions out of necessity but also to the ideological concept of rulership as the protector and provider of agricultural profusion. WIREs Water 2017, 4:e1230. doi: 10.1002/wat2.1230This article is categorized under: Engineering Water > Sustainable Engineering of Water Science of Water > Water and Environmental Change Human Water > Water Governance

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Recent fieldwork and archival sedimentary materials from southern Iraq have revealed new insights into the environment that shaped southern Mesopotamia from the pre-Ubaid (early Holocene) until the early Islamic period. These data have been combined with northern Iraqi speleothem, or stalagmite, data that have revealed relevant palaeoclimate information. The new results are investigated in light of textual sources and satellite remote sensing work. It is evident that areas south of Baghdad, and to the region of Uruk, were already potentially habitable between the eleventh and early eighth millennia B.C., suggesting there were settlements in southern Iraq prior to the Ubaid. Date palms, the earliest recorded for Iraq, are evident before 10,000 B.C., and oak trees are evident south of Baghdad in the early Holocene but disappeared after the mid-sixth millennium B.C. New climate results suggest increased aridity after the end of the fourth millennium B.C. For the third millennium B.C. to first millennium A.D., a negative relationship between grain and date palm cultivation in Nippur is evident, suggesting shifting cultivation emphasising one of these crops at any given time in parts of the city. The Shatt en-Nil was also likely used as a channel for most of Nippur's historical occupation from the third millennium B.C. to the first millennium A.D. In the early to mid-first millennium A.D., around the time of the Sasanian period, a major increase in irrigation is evident in plant remains, likely reflecting large-scale irrigation expansion in the Nippur region. The first millennium B.C. to first millennium A.D. reflects a relatively dry period with periodic increased rainfall. Sedimentary results suggest the Nahrawan, prior to it becoming a well-known canal, formed an ancient branch of the Tigris, while the region just south of Baghdad, around Dalmaj, was near or part of an ancient confluence of the Tigris and Euphrates.