According to ECHO's guidance, the indicator's value should be calculated as the average percentage of the following indicators' value:
> % of population considering that their basic WASH needs are met
> % of population with adequate hygiene practices (according to SPHERE standards on appropriate use and regular maintenance of facilities and on hand washing)
A guidance on collecting and analysing data on the first indicator is provided here.
The second indicator's value should be calculated as the average of the following sub-indicators:
> use of sanitation facility - see guidance here
> maintenance of sanitation facility - see guidance here
> hand washing with soap/ash - see guidance here
Report to ECHO not only the proportion of target population with adequate WASH services and hygiene practices but also the value of individual sub-indicators.