Ratnayake, N.Karunatilleke, C.2020-11-082020-11-081989Engineer, 17(4):p.63-72https://dl-iesl.nsf.gov.lk/handle/1/2359Engineering and TechnologySewage effluent disposalWastewater treatmentPublic health engineeringSeptic tank design:an evaluation of some codes of practiceArticle