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There is no consolidated cross-sector method to calculate a cluster caseload. OCHA often provide provides harmonized methodology at country level. The following approach can nevertheless be used adapted and adapted: 

• Use the WASH PIN numbers for each geographical zone as a starting point
• Use data on access to make a first minimal caseload estimation (see following section)
• Use data on capacity to make a second minimal caseload estimation (see following section)
• Consider the gaps between the minimal caseload obtained and the PIN, and estimate the final caseload considering the advocacy for improvement of access and capacity that should be carried out

Use data on access to make a first minimal caseload estimation

contextualized: 

Rationale: The WASH humanitarian caseload is the part of WASH People in Need (PIN) that can will be targeted considering operational constraints. Main constraints are access to target area (road access, security) and operational, technical and technical financial capacities of partners. If capacity was maximal and access not an issue, the whole population in need could be targeted, and the caseload would be the PIN. But as there are always capacity issuesconstraints, the PIN must be reduced accordingly .

An estimation of the planned access to target area is required to calculate the WASH caseload. If can be difficult for partners to reach the affected area because of bad road access in rainy season, risk of kidnapping or attacks on humanitarian convoys etc. In that case, only a percentage of the population in need can be reached. For example: 

• In regions where there are acute access issues, you can estimate that only half of the PIN can be reached in these regions.
• In regions where access issues are moderate, you can consider that ¾ of the PIN can be reached in these regions

Use data on capacity to make a second minimal caseload estimation

In the same way as for access, an evaluation of partners capacity is required to calculate the WASH caseload. WASH capacity mapping is a long process that can take several months, so if a complete WASH capacity mapping exercise has not been done recently, a lighter and quicker evaluation of capacities needs to be done by the WASH coordination platform before the caseload calculation. 

In each geographical zone, based on the capacity of the partners, estimate the maximum number of people that can be reached by the partners. Compare this figure with the minimal caseload defined by access, and make a second round of caseload estimation

Consider priority advocacy for capacity and access improvement and estimate the final caseload

The figure obtained previously is the minimal caseload, considering a static picture of access and capacity. But access and capacity can be improved if the right advocacy is done at the relevant level. You know need to estimate the final caseload if successful advocacy is done. to obtain the minimal caseload, that can later be increased through advocacy. Use the following steps (refer to the diagram above): 

• Use the WASH PIN numbers for each region as a starting point. 
• Gather information on access and WASH sector capacity 
• Based on the access and the capacity level, as well as the lesson learned from past emergencies, estimate how many people can be reached by WASH partners in each region: this is your minimal caseload.  
• Consider the gaps between the PIN and the minimal caseload in each region. 
• Define priority regions where advocacy for improvement of access and capacity will be focused
• Estimate how the minimal caseload can be increased in priority region through advocacy: this new figure is your final caseload

Even if this figure seem unrealistic at first, an important difference gap between people in need and the people targeted by the response is morally not acceptable as per cluster principles, and the issue must be communicated to the wider audience in advocacy messages.

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