Runoff/infiltration links carry runoff and infiltration from catchments to rivers, reservoirs, and groundwater nodes. Catchment runoff and infiltration is water from precipitation, snow melt, irrigation and soil moisture storage that is not consumed by evapotranspiration or losses to increased soil moisture. Catchment Runoff can also be designated as runoff as the headflow to a river--this option can be selected in the window that opens when the catchment runoff link is created.