Abstract: The memorandum concerns the Seistan Water Award [Sīstān] arbitrated by Britain between Persia and Afghanistan; the award outlines the proportion of water from the River Helmond [Helmand] to be allotted to irrigation on both sides of the river. It is authored by Arthur Henry McMahon — the British commissioner appointed to draft the award — and includes his opinion on the legitimacy of these complaints.Physical description: Foliation: the foliation sequence commences at f 13, and terminates at f 20, as it is part of a larger physical volume; these numbers are written in pencil, and are located in the top right corner of the recto side of each folio. Pagination: the item also contains an original pagination sequence.