Applicable design basis
Record the exact agency, donor, national and local criteria used for water and sanitation planning.
RHELGAN · WASH Capacity Planner
Make population, entered design criteria and service demand visible before system selection.
This tool performs arithmetic using criteria entered by the project team. It deliberately does not set humanitarian, public-health or statutory standards. Applicable agency, donor, national and programme requirements must be entered and verified by the responsible project professionals.
Entered project criteria
Replace the example values with the project’s actual design basis.
The pre-filled values are arithmetic examples only and must not be interpreted as WHO, UNHCR, donor, national or local minimums. Enter the criteria applicable to the actual programme before using the outputs.
Close the real WASH brief
Arithmetic is only the start of WASH infrastructure design.
Water source, quality, treatment, storage, distribution, sanitation technology, wastewater, gender/accessibility, cleaning, power, climate and operator capability all change the final system.
Source + quality
Define source reliability, raw-water quality, treatment duty, drinking-water pathway and monitoring responsibility.
Wastewater pathway
Confirm sewer, septic, holding, treatment or off-site disposal strategy plus desludging/service access.
Hot water + power
Showers and cleaning may require heating, pumps and controls that materially change power and storage.
Accessibility + safeguarding
Facility layout, privacy, lighting, gender/age needs and accessible routes must be designed for the actual users.
Operations
Consumables, cleaning, water testing, desludging, spares and operator responsibilities should be planned before handover.
From arithmetic to programme infrastructure