This repository contains the processed datasets, Python notebooks, figure source data, and software requirements used to reproduce the analyses presented in the manuscript "Climate Forcing and Engineering Design Controls on Household Rainwater Harvesting System Reliability in Peri urban Dar es Salaam, Tanzania". The repository includes processed CSV outputs, manuscript figures, supplementary figures, Jupyter notebooks implementing the analysis workflow, and a requirements file describing the Python environment. Raw CHIRPS observations and CORDEX Africa regional climate model datasets are not redistributed because they are subject to third party licensing restrictions. Their sources and preprocessing procedures are documented in the accompanying manuscript and repository documentation.