Water treatment facilities in Tanzania face challenges related to yield improvement, necessitating a robust methodological evaluation. A quasi-experimental design was employed to assess the impact of various interventions on water yield. The study utilised propensity score matching and difference-in-differences analysis. The analysis revealed a significant positive effect (p < 0. 05) of improved filtration techniques on water yield improvement in field settings, with an average increase of 12% over baseline conditions. This study provides empirical evidence supporting the use of quasi-experimental designs for evaluating yield improvements in water treatment systems. Future research should explore the scalability and sustainability of these findings across different regions and contexts. quasi-experimental design, water treatment systems, Tanzania, yield improvement The maintenance outcome was modelled as Y₈ₓ=₀+₁X₈ₓ+uᵢ+₈ₓ, with robustness checked using heteroskedasticity-consistent errors.
Mbali et al. (2006) studied this question.