Modelling Rainwater Harvesting System in Ibadan Nigeria: Application to a University Campus Office block

Omolara Lade1 and David Oloke2

1 Department of Civil Engineering, University of Ibadan, Nigeria
2 Faculty of Science and Engineering, University of Wolverhampton, United Kingdom
Email: omolaralade@yahoo.com

ABSTRACT
Rainwater harvesting (RWH) is a popular supplementary water supply source for various purposes, including drinking, sanitation and irrigation. This paper presents the hydraulic and financial modelling of a RWH system using an office block. A Raincycle model was used to optimise tank size and savings. Sensitivity analysis and Monte Carlo simulation were also carried out. The analysis consists of a detailed assessment of the proposed system, considering of seven fixed and 11 variable parameters. The RWH and water savings efficiency were assessed, and payback period was estimated. Optimising tank size and savings reveal that the maximum percentage of demand that could be met was 75 % with a tank size of 10 m3 and savings of $ 2,564 over 50 years. It had a payback period of 8 years, which is typical for a commercial system. This method can be used for other offices in the Departments/Faculties on the University campus.

Key words: rainwater harvesting, water savings, payback period, office block, Ibadan, Nigeria

Cite this article:
Lade, O. & Oloke, D.(2019) Modelling Rainwater Harvesting System in Ibadan Nigeria: Application to a University Campus Office block. European International Journal of Science and Technology, 8(10), 57-71.