by Sean Furey, Skat Foundation / UPGro Knowledge Broker Team
AGUASAN Workshop: “Leveraging the data revolution Informed decision-making for better water and sanitation management” June 25th to 29th 2018, Spiez, Switzerland
AGUASAN is the Swiss Community of Practice for water and sanitation that has been running since 1984 and comprises regular meetings through the year and an annual week-long workshop focused on a specific topic, which this year was around role of data in decision-making in water and sanitation services. Around 40 participants attended at a really great training facility in Spiez, in central Switzerland. They came, not just from Swiss organisations, but from a wide range of partners (many who are active RWSN members). There were participants from Bangladesh, Tajikistan, Mozambique, Peru, Thailand, Mali, Pakistan, Benin, Egypt, Mongolia, the UK, South Africa, US and many more. I was attending on behalf of RWSN, UPGro and REACH because the network and both research programmes have a lot to share on this topic.
In a region where access to safe, affordable water is limited, manual drilling provides a cost-effective way of tapping groundwater resources. However, aquifers are complex and striking fresh water is not guaranteed.
Fussi and his team propose a model that uses analysis of borehole logs for the to characterise shallow aquifers so that areas suitable for manual drilling can be found. The model is based on available borehole-log parameters: depth to hard rock, depth to water, thickness of laterite (a iron-rich rock type common in the tropics) and hydraulic properties of the shallow aquifer. The model was applied to a study area in northwestern Senegal.
The hydraulic conductivity values – how easily water flows through rock – were estimated from geological data and partially validated by comparing them with measured values from a series of pumping tests carried out in large-diameter wells.
The results show that this method is able to produce a reliable interpretation of the shallow hydrogeological context using information generally available in the region.
The research contributes to improving the identification of areas where conditions are suitable for manual drilling, and has the potential to be used throughout Africa, and beyond, using data available in most African countries.
Ultimately, this work will support proposed international programs aimed at promoting low-cost water supply in Africa and enhancing access to safe drinking water for the population.