Estimating faecal sludge quantity on a city wide scale with the help of a volaser

  • burton
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Estimating faecal sludge quantity on a city wide scale with the help of a volaser

Estimating faecal sludge quantity can be hectic. Onsite sanitation containments have varying shapes and sizes around the world because they are constructed by different people according to what they want, and because they are under ground, it makes it difficult (if not impossible) to estimate the total amount of accumulated faecal sludge on a neighborhood or city-wide scale. A volaser is an instrument that was developed to measure volumes of faecal sludge inside latrines for the ultimate goal of aiding planning for improved sanitation services worldwide. It consists of a measuring head with a distance-laser module, a tripod-stand, and a telescopic rod to measure depth. To know more about the volaser visit sirop.org/app/be5277af-2ae5-48c9-92d5-e6f4a3f593c6

My question is on estimating the total quantity of faecal sludge from all containment facilities e.g pit latrines, after measuring the volumes with a volaser. With an existing number of over 1000 latrines,what could be the best and most accurate method of estimating the FQ given a sample size of 150 latrines. I thought averaging the obtained 150 latrine sludge volumes and multiplying by the total number of containments would misrepresent the actual total quantity because volumes of sludge differ significantly due to age of latrine, number of users and other factors. what do you think can be the best way to approach this?
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