Another canal, which we know was cut by Eannatum, was that separating the plain of Gu-edin from the territory of Umma, but this was undertaken, not for purposes of irrigation, but rather as a frontier-ditch to mark the limits of the territory of Lagash in that direction. There is little doubt, however, that at least a part of its stream was used for supplying water to those portions of Gu-edin which lay along its banks. Like the canal Lummadimdug, this frontier-ditch was also dedicated to Ningirsu, and in the inscription upon a small column which records this fact, the name of the canal is given as Lummagirnuntashagazaggipadda. But this exceedingly long title was only employed upon state occasions, such as the ceremony of dedication; in common parlance the name was abbreviated to Lummagirnunta, as we learn from the reference to it upon Entemena's Cone. It is of interest to note that in the title of the stone of delimitation, which occurs upon the Stele of the Vultures, reference is made to a canal named Ug-edin, the title of the stone being given as "O Ningirsu, lord of the crown ..., give life unto the canal Ug-edin!" In the following lines the monument itself is described as "the Stele of Gu-edin, the territory beloved of Ningirsu, which I, Eannatum, have restored to Ningirsu"; so that it is clear that the canal, whose name is incorporated in that of the stele, must have had some connection with the frontier-ditch. Perhaps the canal Ug-edin is to be identified with Lummagirnunta, unless one of the two was a subsidiary canal. For the supply of his principal irrigation-canal with water after the period of the spring-floods, Eannatum did not depend solely upon such water as might find its way in from the river, before the surface of the latter sank below the level of the canal-bed; nor did he confine himself to the laborious method of raising it from the river to his canal by means of irrigation-machines. Both these methods of obtaining water he doubtless employed, but he supplemented them by the construction of a reservoir, which should retain at least a portion of the surplus water during the early spring, and store it up for gradual use in the fields after the water-level in the river and canals had fallen. In the passage in his foundation-inscription, which records this fact, he says: "For Ningirsu he founded the canal Lummadimdug and dedicated it to him; Eannatum, endowed with strength by Ningirsu, constructed the reservoir of Lummadimdug, with a capacity of three thousand six hundred _gur_ of water."[42] It is true that his reservoir was not of very imposing dimensions, but its construction proves that Eannatum or his engineers had studied the problem of irrigation in a scientific spirit, and had already evolved the method of obtaining a constant water-supply which is still regarded as giving the best results.