Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
A Drainage System for Road Construction on Flat Terrain in New Owerri Nigeria
Conventional road drainage system commonly adopted in the city of New Owerri Nigeria is grossly ineffective and unsustainable, and this gives rise to prolonged pools of water after cessation of rainfall. The water pools often cause road pavement failure, disruption of free flow of traffic, submergence of residential apartments, disruption of commercial activities and exponential rise in mosquito population due to the occurrence of fertile breeding grounds. Research has shown that the use of a trenchless drainage system in road construction, whereby an engineered open trench is backfilled with relatively permeable material, can be a suitable alternative on the flat terrain. It was observed that a 50 cm depth of water completely drains off in such a system within 30 min of cessation of rainfall, instead of the usual two to three weeks duration. Five conditions were examined in the course of the research. The rate of drawdown recorded for the various conditions are 3.7 cm/min for open trench i.e. without a backfill; 3.3 cm/min for trench backfilled with gravelly sand; 2.8 cm/min with fine sand; 2.0 cm/min with mixed sand and 3.5 × 10−4 cm/min for the open concrete drain. It was observed that materials with higher values of both the diameter at 30% passing and coefficient of uniformity are more effective in the drain ability. The unit construction cost of standard concrete drain was found to be about two (2) to three (3) times higher than that of an equivalent sized trenchless drain filled with gravel.
A Drainage System for Road Construction on Flat Terrain in New Owerri Nigeria
Conventional road drainage system commonly adopted in the city of New Owerri Nigeria is grossly ineffective and unsustainable, and this gives rise to prolonged pools of water after cessation of rainfall. The water pools often cause road pavement failure, disruption of free flow of traffic, submergence of residential apartments, disruption of commercial activities and exponential rise in mosquito population due to the occurrence of fertile breeding grounds. Research has shown that the use of a trenchless drainage system in road construction, whereby an engineered open trench is backfilled with relatively permeable material, can be a suitable alternative on the flat terrain. It was observed that a 50 cm depth of water completely drains off in such a system within 30 min of cessation of rainfall, instead of the usual two to three weeks duration. Five conditions were examined in the course of the research. The rate of drawdown recorded for the various conditions are 3.7 cm/min for open trench i.e. without a backfill; 3.3 cm/min for trench backfilled with gravelly sand; 2.8 cm/min with fine sand; 2.0 cm/min with mixed sand and 3.5 × 10−4 cm/min for the open concrete drain. It was observed that materials with higher values of both the diameter at 30% passing and coefficient of uniformity are more effective in the drain ability. The unit construction cost of standard concrete drain was found to be about two (2) to three (3) times higher than that of an equivalent sized trenchless drain filled with gravel.
A Drainage System for Road Construction on Flat Terrain in New Owerri Nigeria
Lecture Notes in Civil Engineering
Reddy, Krishna R. (Herausgeber:in) / Agnihotri, Arvind K. (Herausgeber:in) / Yukselen-Aksoy, Yeliz (Herausgeber:in) / Dubey, Brajesh K. (Herausgeber:in) / Bansal, Ajay (Herausgeber:in) / Owuama, Ozioma C. (Autor:in) / Owuama, Kennedy C. (Autor:in)
17.09.2020
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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