Hydraulic characteristics of the plastic pipes of drainage colletors

Abstract

In Lithuania, plastic drain pipes are being used when building new land reclamation systems or recon-structing already existing. It is connected with the better constructions and technological characteristics of plastic pipes in comparison with the tile clay drainage pipes. Various factories produce a wide assortment of plastic pipes, vvhich differ not only in the sizes of their inside diameters, but in their constructional characteristics as well. It has a significant impact upon the water flow of pipes or upon their hydraulic characteristics. Applying theoretical formulas, which were received following the results of experimcntal investigations carricd out for the pipes of particular types, the errors (up to 30 per cent) of the water flow of pipcs were received. Results of the hydraulic investigations of plastic drain pipes of constructions and diameters used in Lithuania are presented in the article. Following the created water flow dependencies of smooth and corrugated plastic drainage pipcs (for the drainage collectors) with various diameters, mathematical and graphical dependencies of water flow, pipe diameters and pipe slope, vvhich are recommended to be applied when carrying out hydraulic calculations of plastic drainpipes, were made.