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Makokha, Mary, Waswa, Fuchaka, Kimani, Samuel. (1405). Quantifying Potential Roof Catchment Yields for Climate resilience and Improved Water security at Semi-arid Kitui Campus of Kenyatta University. , (), -. doi: 10.22077/jwhr.2026.10723.1196
Mary Makokha; Fuchaka Waswa; Samuel Kimani. "Quantifying Potential Roof Catchment Yields for Climate resilience and Improved Water security at Semi-arid Kitui Campus of Kenyatta University". , , , 1405, -. doi: 10.22077/jwhr.2026.10723.1196
Makokha, Mary, Waswa, Fuchaka, Kimani, Samuel. (1405). 'Quantifying Potential Roof Catchment Yields for Climate resilience and Improved Water security at Semi-arid Kitui Campus of Kenyatta University', , (), pp. -. doi: 10.22077/jwhr.2026.10723.1196
Makokha, Mary, Waswa, Fuchaka, Kimani, Samuel. Quantifying Potential Roof Catchment Yields for Climate resilience and Improved Water security at Semi-arid Kitui Campus of Kenyatta University. , 1405; (): -. doi: 10.22077/jwhr.2026.10723.1196

Quantifying Potential Roof Catchment Yields for Climate resilience and Improved Water security at Semi-arid Kitui Campus of Kenyatta University

Water Harvesting Research
مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 30 اردیبهشت 1405
نوع مقاله: Case Study
شناسه دیجیتال (DOI): 10.22077/jwhr.2026.10723.1196
نویسندگان
Mary Makokha* 1؛ Fuchaka Waswa1؛ Samuel Kimani2
1Kenyatta University
2Jomo Kenyatta University of Agriculture and Technology
چکیده
Water scarcity poses a significant challenge in semi-arid regions, with climate variability and growing demand exacerbating the strain on traditional water sources. As a contribution to sustainable water solution in a dryland region, this study reports the potential harvest from rooftop catchments in a populated built environment using Kenyatta University, Kitui Campus, in Kenya, as a case study. Roof catchment areas were computed using standard GIS procedures. Mean monthly rainfall was established using rainfall trends from 1981–2024. Estimated harvestable water was calculated standard formula for volume, but discounted for expected evaporation and seepage loses using applicable runoff coefficients. Results show that the entire campus can collect at least 11 million litres annually, with institutional buildings contributing 7.8 million litres and the staff quarters 3.4 million litres per year. With a population of about 1000 people coupled with water use efficiency, the campus can operate within a water secure scenario throughout the year. Seasonal analysis reveals that the October–December provides 361 mm of rainfall twice the volume of the March–May (MAM) which is 176 mm, necessitating strategic storage solutions to bridge dry periods. Based on the cost factor of above ground plastic tanks, this study proposes decentralized rainwater harvesting systems combining a series of large-capacity residential tanks available on the market (30,000-50,000 litres) for high-yield buildings and smaller tanks (5,000–20,000 litres) per individual residential houses. Lessons from this paper offer opportunities for improved public health and irrigation agriculture at Kitui Campus, other learning institutions, and households with ridged roof catchments.
کلیدواژه‌ها
Rainwater harvesting؛ Water security؛ Built Environment؛ Semi-arid regions
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تعداد مشاهده مقاله: 3


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