Estimation of Storage Tank Capacities for Different Roof Catchment Areas for Rainwater Harvesting in Dodoma Urban, Tanzania

Authors

  • Ombeni J. Mdee University of Dodoma
  • Malugu M. Tembo University of Dodoma
  • William J. S. Mwegoha University of Dodoma

Abstract

This study uses a mass balance model and economic analysis technique to present an estimation of roofing areas and storage tank capacity for Rainwater Harvesting (RWH) system. The water-saved benefits were estimated using the monthly rainfall of over 39 years from 1981 to 2020 and five roofing areas. The proposed roof-storage-ratio method presents the minimum requirement of roof area and storage tank size when the ratio value is closer to 1. The benefit-cost ratio and percentage of reliability indicated the optimal roofing areas ranging between 200 and 300 m2 for storage tank capacity between 20 and 25 m3, with a minimum discount rate of 5%. The increased capacity of storage tank and roofing area would also be a potential factor to increase the investment cost for installing the RWH system.

 Keywords: Rainwater harvesting, roofing areas, storage tank, economic analysis

Author Biographies

Ombeni J. Mdee, University of Dodoma

College of Earth Sciences and Engineering  

Malugu M. Tembo, University of Dodoma

College of Earth Sciences and Engineering

William J. S. Mwegoha, University of Dodoma

College of Earth Sciences and Engineering,

 

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Published

2022-08-05

How to Cite

Mdee, O. J., Tembo, M. M., & Mwegoha, W. J. S. (2022). Estimation of Storage Tank Capacities for Different Roof Catchment Areas for Rainwater Harvesting in Dodoma Urban, Tanzania. Tanzania Journal of Engineering and Technology, 41(2). Retrieved from https://journals.udsm.ac.tz/index.php/tjet/article/view/5019

Issue

Vol. 41 No. 2 (2022): Tanzania Journal of Engineering and Technology (TJET)

Section

Articles