2021 Volume 27 Issue 66 Pages 871-876
This paper aims to examine the applicability of “Extra drainage systems” which can complement conventional drainage system. Firstly, the authors asked participants about the difficulty using conventional drainage system and the idea using extra drainage systems. Then, the authors classified collected cases into 19 categories of drainage problems. After that, the authors got the evaluation of applicability of extra drainage systems to solve the problems by technical experts of those systems. The result showed those systems are effective to solve 16 categories of problems. Therefore, it is confirmed that extra drainage systems are useful to solve current problems of drainage.
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