A water extractor for an environmental control system, comprising: a primary duct having an inlet and an outlet; a scupper with a scupper inlet extending about the inlet of the primary duct; and a supply duct in fluid communication with the primary duct having a wall thickness and an interior surface terminating at the scupper inlet, wherein the interior surface defines at least one swirl groove within the wall thickness for gathering and conveying liquid water entrained in an airflow traversing the inlet duct to the scupper inlet; and wherein: the supply duct defines a flow axis, wherein the swirl groove traces a segment of a helical path extending about the flow axis; the supply duct has a turning portion and an axial portion, and the axial portion arranged between the turning portion and the scupper inlet; the swirl groove spans the axial portion of the supply duct, and the swirl groove extends along the turning portion of the supply duct; the turning portion has an inner radius and an outer radius, the outer radius greater than the inner radius, the swirl groove intersects the outer radius of the turning portion, and the swirl groove does not intersect the inner radius; and the swirl groove is a first swirl groove and the supply duct has at least one second swirl grove; the second swirl groove is similar to the first swirl groove and additionally (a) extends in parallel with the first swirl groove, (b) starts at a location circumferentially offset from an inlet of the first swirl groove, and (c) terminates at a location circumferentially offset from the outlet of the first swirl groove. a primary duct having an inlet and an outlet; a scupper with a scupper inlet extending about the inlet of the primary duct; and a supply duct in fluid communication with the primary duct having a wall thickness and an interior surface terminating at the scupper inlet, wherein the interior surface defines at least one swirl groove within the wall thickness for gathering and conveying liquid water entrained in an airflow traversing the inlet duct to the scupper inlet; and wherein: the supply duct defines a flow axis, wherein the swirl groove traces a segment of a helical path extending about the flow axis; the supply duct has a turning portion and an axial portion, and the axial portion arranged between the turning portion and the scupper inlet; the swirl groove spans the axial portion of the supply duct, and the swirl groove extends along the turning portion of the supply duct; the turning portion has an inner radius and an outer radius, the outer radius greater than the inner radius, the swirl groove intersects the outer radius of the turning portion, and the swirl groove does not intersect the inner radius; and the swirl groove is a first swirl groove and the supply duct has at least one second swirl grove; the second swirl groove is similar to the first swirl groove and additionally (a) extends in parallel with the first swirl groove, (b) starts at a location circumferentially offset from an inlet of the first swirl groove, and (c) terminates at a location circumferentially offset from the outlet of the first swirl groove. the supply duct defines a flow axis, wherein the swirl groove traces a segment of a helical path extending about the flow axis; the supply duct has a turning portion and an axial portion, and the axial portion arranged between the turning portion and the scupper inlet; the swirl groove spans the axial portion of the supply duct, and the swirl groove extends along the turning portion of the supply duct; the turning portion has an inner radius and an outer radius, the outer radius greater than the inner radius, the swirl groove intersects the outer radius of the turning portion, and the swirl groove does not intersect the inner radius; and the swirl groove is a first swirl groove and the supply duct has at least one second swirl grove; the second swirl groove is similar to the first swirl groove and additionally (a) extends in parallel with the first swirl groove, (b) starts at a location circumferentially offset from an inlet of the first swirl groove, and (c) terminates at a location circumferentially offset from the outlet of the first swirl groove.