Abstract
This study focuses the drainage performance evaluation of combined house drain. The purpose of this paper is to proposal for a estimation method of drainage capability taken into combined house drain. In Previous paper, authors discussed about the performance of drainage system with conversional fittings, calculated the air pressure fluctuation (mean, maximum and minimum) of drainage stack systems with special fitting and considered the possibility of the prediction of pressure of this or the system as the index of drainage performance evaluation in this paper.
