The impact of application of FOSS4G on Non Revenue Water
2021-10-01, 09:30–10:00, Humahuaca

Nanyuki water and sewerage company (NAWASCO) is located in Nanyuki town Laikipia county operates as a county water service provider mandated to serve Nanyuki town and its environs. For a long time, NAWASCO’s field officers used old maps to monitor water connections. Having inherited customers from the Nanyuki Municipal council, they had to do an intense ground work to mark their territory. They walked around with the old maps following water pipelines between intake and the consumption points in order to identify the number of customers served under their jurisdiction.
That was cumbersome! With advancement in technology, a decision was made to digitize the system to ease the identification burden.
Journey to Digitization.
To kick-off the digitization journey, QGIS a Free and Open Source Geographic Information software was used to convert old maps into computer readable documents that were used to develop the Geographic Information System. A GIS database was developed using POSTGIS where all the digitized data were stored. For analysis purposes and building a strong GIS system field data was collected using hand held GPS .These included pressure data, new connections, newly installed appurtenances and fittings.
The amount of water lost between production and billing points has been one of the major challenges faced at NAWASCO. FOSS4G applications has assisted the team to have a better understanding of network and prompt leaks and bursts repairs hence reducing non- revenue water. Nanyuki water success story of Non-Revenue water reduction from 55% to 30% is largely due to adoption of GIS technology (Free and Open Source Geographic Information software. The water utility has also improved its billing efficiency through GIS. Meter readers, billing officers, repairs and maintenance team and non-revenue water team are now able to locate customers using shared vector tiles from the link.

This is a presentation proposal on the impact of FOSS4G in Nanyuki water and Sewerage company.
- Roles OF GIS in Nawasco
- Planning support
- Design support
- Maintenance support
- Performance analysis support

FOSS4G are used in NAWASCO to determine the location of customer meters, water pipes, sewerage pipes and other Appurtenances using mobile phones, tablets or laptop.

This talk is related to another talk - "FOSS4G software developments for Water Utilities Management in Eastern Africa by using Vector Tiles".

Authors and Affiliations


Jin IGARASHI - Open source GIS software developer, also former JICA volunteer at Narok Water and Sewerage Services Company, Kenya. Developing vector tiles based Web-GIS system for Nanyuki Water and Sewerage Company.

Requirements for the Attendees Track

Use cases & applications


FOSS4G for Sustainable Development Goals (SDG)


2 - Basic. General basic knowledge is required.

Language of the Presentation


Senior software developer specializing in GIS field with more than 10 years of work experience in Japan and Eastern Africa. Main interest is how GIS can collaborate with water supply management efficiently. I am also main contributor to translate some QGIS documents, QField and Input to Japanese language.

This speaker also appears in:

JAMES KIRUMBA NJENGA is an effective and ambitious individual with a compelling interest and knowledge in comprehensive response to meeting consumers’ needs .He is a GIS officer in Nanyuki water and Sewerage Company in Laikipia County.