MICROFICHE REFERENCE LIBFUUW - Cd3wd.com

animal is returning to the top, the rope is detached, the bucket loweredto the water source, and the rope hitched to the other animal which hasalready returned. Although this scheme can increase the buckets per unittime, it also increases the amount of input power, i.e., more animals, aperson to drive them, and another to return the rope hitch.Another modification to the mot eliminates the need for the personemptying the bucket. As illustrated in Figure 3.2, the self-emptyingmot or sundio kos utilizesa bag with a large opening at one end (the topwhen in the water) and a spout at the other. %JO ropes are attached, oneeach to the top and spout. Each rope passes over a separate roller, butboth are attached to the pulling animal. While in the water and beinglifted, the spout stays above the bag top, but upon reaching its lowerroller, the spout is pulled down and allows the bag to drain. These bagsare usually hides attached to an iron or wooden ring and may vary in sizefrom about 24 to 42 gallons (Roberts and Singh, 1951). Lifts usually varyfrom 10 to 50 feet for not use (Wilson, 1896). Discharges of 250 cfh havebeen reported for a 30 foot lift using one pair of bullocks and 600 cfhwith two pair at the same head (Molenaar, 1956).One other variation of the rope-bucket-pulley is shown in Figure 3.2.It is referred to as a two bucket lift, double mot, or circular mot. Thisfigure also illustrates another design for a solid bucket as it could beused in the conventional mot. This water lifter uses two buckets (withbottom flap valves), attached to two parallel guide rails running up awell or shore wall. A rope (or chain) is attached to each bucket andpassed through pulleys on poles diametrically opposite each other, witha circular sweep in between. An animal is usually used to turn this sweepand thus alternately raise and lower the two buckets. As illustrated