MICROFICHE REFERENCE LIBFUUW - Cd3wd.com

153of building and installing the devices must also be a:r:ilable. It shouldalso be noted that although the use of natural or mechanical drivers doesnot directly employ individuals as does a manually-operated water lifter,the employment needs for the light or medium industry to locally producenatural and mechanical drivers can often provide more occupationalalporturnities than would the need for individual water lieier operators.Although assistance programs often provide developing regions withnew water lifting equipment, sufficeint training and/or spare parts aresometimes not made, nor kept, available. Thus, in many instances, waterlifters fall into disuse and eventually, when left to natural elements,becomeunrepairable (Fannon and Frink, 1970).Not only must the availability of a fuel or electricity be considered,but also their quality. Fuels, particularly in developing countries, areoften of such low octane or contain too many impurities (e.g., dirt, water,etc.) to make them unusable. If natural prime movers are to be used, theirenergy potential must be evaluated at the water lifting site--e.g., meanwind or water velocity, daily solar radiation.In addition to various water lifters and drivers being available fora given installation, they must also be physically adaptable. For example,as mentioned in Chapter 3, some pumps are not well suited for pumpingabrasive water. Also, certain prime movers may not be environmentallyacceptable to a site (e.g., noise, air pollution).Likewise, the environment may not be conducive to optimum prime moveroperation. As previously mentioned, engines and motor perform poorly whenthey are too hot, become clogged with dust, rust from exposure, etc.Similar consideration must also be given to manual and animal prime movers.Poor environmental conditions, such as heat, humidity, dust, and insects,