Drop manholes in supercritical pipelines

Christodoulou George, C

dc.contributor.author	Christodoulou George, C	en
dc.date.accessioned	2014-03-01T01:08:19Z
dc.date.available	2014-03-01T01:08:19Z
dc.date.issued	1991	en
dc.identifier.issn	0733-9437	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10415
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0026001817&partnerID=40&md5=a6a0c9848e66a14c4834212029cda90a	en
dc.subject.classification	Agricultural Engineering	en
dc.subject.classification	Engineering, Civil	en
dc.subject.classification	Water Resources	en
dc.subject.other	Drainage	en
dc.subject.other	Energy Dissipation	en
dc.subject.other	Flow of Water--Pipes	en
dc.subject.other	Hydraulic Jump	en
dc.subject.other	Hydraulic Structures--Energy Dissipators	en
dc.subject.other	Drop Manholes	en
dc.subject.other	Head Loss	en
dc.subject.other	Supercritical Pipelines	en
dc.subject.other	Urban Drainage Networks	en
dc.subject.other	Sewers	en
dc.subject.other	Drains	en
dc.subject.other	Supercritical Flow	en
dc.title	Drop manholes in supercritical pipelines	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1991	en
heal.abstract	In urban drainage networks on steep terrain, drop manholes are often employed for energy dissipation and reduction of flow velocities. The hydraulic behavior of such circular manholes located between supercritical pipe segments is studied by means of laboratory experiments. It is found that the local head-loss coefficient is governed solely by a dimensionless drop parameter, terms of the drop height and the inflow velocity. An analytical expression based on the experimental results is proposed for pratical applications. on the experimental results is proposed for practical applications. The water level inside the manhole depends also on the angle between the inflow and outflow pipes, being higher when they are normal as compared to parallel. Optimum ranges of the drop parameter, in order to avoid impediment to the flow by formation of a hydraulic jump or surcharging of the pipe, may be determined and used in engineering practice.	en
heal.publisher	ASCE-AMER SOC CIVIL ENG	en
heal.journalName	Journal of Irrigation and Drainage Engineering	en
dc.identifier.isi	ISI:A1991EV22300003	en
dc.identifier.volume	117	en
dc.identifier.issue	1	en
dc.identifier.spage	37	en
dc.identifier.epage	47	en