<P> Records at the Brak administrative complex suggest that the Akkadians appointed locals as tax collectors . </P> <P> The population of Akkad, like nearly all pre-modern states, was entirely dependent upon the agricultural systems of the region, which seem to have had two principal centres: the irrigated farmlands of southern Iraq that traditionally had a yield of 30 grains returned for each grain sown and the rain - fed agriculture of northern Iraq, known as the "Upper Country ." </P> <P> Southern Iraq during Akkadian period seems to have been approaching its modern rainfall level of less than 20 mm (1 in) per year, with the result that agriculture was totally dependent upon irrigation . Before the Akkadian period the progressive salinisation of the soils, produced by poorly drained irrigation, had been reducing yields of wheat in the southern part of the country, leading to the conversion to more salt - tolerant barley growing . Urban populations there had peaked already by 2,600 BC, and demographic pressures were high, contributing to the rise of militarism apparent immediately before the Akkadian period (as seen in the Stele of the Vultures of Eannatum). Warfare between city states had led to a population decline, from which Akkad provided a temporary respite . It was this high degree of agricultural productivity in the south that enabled the growth of the highest population densities in the world at this time, giving Akkad its military advantage . </P> <P> The water table in this region was very high and replenished regularly--by winter storms in the headwaters of the Tigris and Euphrates from October to March and from snow - melt from March to July . Flood levels, that had been stable from about 3,000 to 2,600 BC, had started falling, and by the Akkadian period were a half - meter to a meter lower than recorded previously . Even so, the flat country and weather uncertainties made flooding much more unpredictable than in the case of the Nile; serious deluges seem to have been a regular occurrence, requiring constant maintenance of irrigation ditches and drainage systems . Farmers were recruited into regiments for this work from August to October--a period of food shortage--under the control of city temple authorities, thus acting as a form of unemployment relief . Gwendolyn Leick has suggested that this was Sargon's original employment for the king of Kish, giving him experience in effectively organising large groups of men; a tablet reads, "Sargon, the king, to whom Enlil permitted no rival--5,400 warriors ate bread daily before him". </P>

What is the width of the akkadian empire