MICROFICHE REFERENCE LIBFUUW - Cd3wd.com

41two ropes, swing the basket back and forth. In the return motion fromthe higher elevation, the basket is dipped and filled. Then, on thereverse swing, 2 twisting of the ropes is usually done to throw the waterUP- This simple device is also referredto as:lathakatwehjhatta(Pakistan)mentalbasket scoop (India)Reported performance data appears to be rather questionable. Buckley'swork in 1905 indicates a discharge of 2000 cfh with a one foot lift, whileMolenaar in 1956 reports cnly 180 cfh with a two foot lift. Based on theperformance of a similar device, the shovel (Section 3.2.2.2), the formerdischarge seems high and the latter low.Of course, the initial cost of the basket and ropes is very littleand repairs can be made almost immediately.3.2.2.2 Shovel or ScoopBy merely using a semi-enclosed shovel, such as the Dutch scoopin Figure 3.5, a single person can throw water. However, Weishack andHerrmann (1897) report that one person can bail water at about the samedischarge he can throw it because of the high spillage losses. Therefore,the shovel is usually attached by rope to a tripod and operated as inFigure 3.5. This method reportedly (Molenaar, 1956) produces a dischargeof about 300 cfh up a 3 foot lift. Additional ropes may be attached sothat one, or usually two, person(s) can pull the shovel as the firstpushes. In this manner, roughly 30 cycles can be made in a minute,throwing about 1500 cfh against a head of 4 feet. This would require eachof the three lifters to do about 120,000 ft-lbs of work per hour.