2006-12-14 09:08:51 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Geography
Irrigation - digging ditches and have the water flow in
2006-12-14 09:12:35 · answer #1 · answered by Cheyenne 3 · 0⤊ 0⤋
Canals, channels & dykes to tap and control the overflow of the Nile. When the water levels are low, the fellaheen (tillers of the soil) then have to raise the water from the river, the canals, or the numerous wells fed by natural infiltration, so as to water their fields.
Two machines chiefly are used for this purpose; the sâkyeh and the shâdûf. The sâkyeh consist of two cog-wheels working at right angles to each other. The perpendicular wheel carries an endless chain, to which are attached leathern, wooden, or clay buckets. As the wheel turns the buckets are dipped in the water and filled, when they are lifted and emptied into a channel which carries the water into the fields. These machines are worked by asses or buffaloes in Egypt and by camels in Nubia. The shâdûf is a roughly made pair of gigantic scales in which the trays are replaced by a bucket on one end and a stone on the other, the stone being a little more than the weight of the bucket when filled. A man stands on the bank and, pulling on the rope to which the bucket is attached, submerges the latter, then letting go, the weight of the stone pulls the bucket out, when it can be emptied into the proper channel. In the Lower Delta, where the level of the water in the canals remains nearly the same, they use a wooden wheel called tâbût, which raises the water by means of numerous compartments in the hollow felloes.
2006-12-14 19:33:15 · answer #2 · answered by Carl 3 · 0⤊ 0⤋
Yeah, Mike up there is right; it's a "screw" that looks kinda like a ship's propeller, but it's long in a way like a corkscrew.
In order to hold the water inside, it was covered by a long cylindrical sheet of metal. Turning the top part with a crank sucks up the water at the lower lake/river/pond level to be poured out at a desired higher level.
2006-12-14 17:36:59 · answer #3 · answered by McMurdo 3 · 0⤊ 0⤋
Archimedes' screw or the Archimedean screw is one of several inventions and discoveries reputed to have been made by Archimedes. A means of raising water by means of a screwing action............
2006-12-14 17:16:20 · answer #4 · answered by thomasrobinsonantonio 7 · 0⤊ 0⤋
feet and buckets
2006-12-14 17:12:22 · answer #5 · answered by answerman 4 · 0⤊ 0⤋
IRRAGATION
2006-12-14 17:16:33 · answer #6 · answered by Jim 3 · 0⤊ 0⤋