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Hi Frank,
You could have a look to Australia' Aid Environment Management Guide
https://dfat.gov.au/about-us/publications/Pages/environment-management-guide-for-australia-s-aid-program.aspx
https://dfat.gov.au/about-us/publications/Pages/Results.aspx?ak=&acat=&at=Water%2c+sanitation+and+hygiene&ac=&ar=&adf=&adt=&ai=
Cheers,
Debora