MICROFICHE REFERENCE LIBFUUW - Cd3wd.com

156Such systematic selection is not usually possible when dealing withthe less sophisticated water lifters, such as shadoofs, mots, norias, etc.Although these devices are often built by trial and error (Schioler, 1975)to fit the given installation, a careful analysis of the head and dischargeneeds, as well as available power (e.g., animal, slow stream, fast wind,etc.) can allow selection of a good water lifter. Furthermore, as wasshown by Figure 2.3, H-Q curves can be developed for any water lifter--even one as simple as the bucket. Such performance curves can be a greatasset in improving the application of many of the less sophisticated waterliftingdevices.6.4 CostAfter the above factors have been considered in the selection process,those water lifters which appear applicable should then be evaluated foreconomic feasibility. The initial cost alone of some water lifters andpumps may be too great to be economically competitive with others. However,in some instances, a slightly higher initial cost for higher quality maybe offset by lower operating and maintenance costs. Likewise, an economicanalysis of the pumping system, i.e., pipe, valves, etc. (if one exists)should be considered in relation to the required pump.In addition to first costs of the water lifter and system (which mayinclude sinking a well) which should be evaluated as depreciation andinterest over the projected life of the equipment, other fixed costs(i.e., taxes and insurance) and operating costs (i.e., power, maintenance,and labor) must be evaluated. The following example illustrates how suchan economic analysis may be considered for a mote.