The present study investigated the formation of upwash by the impingement of two liquid sheets on a solid wall. Here I considered the case when two liquid jets impinge on a solid wall, generating two liquid sheets, which in turn generates an upwash. The upwash greatly affects the spray characteristics and the spatial dispersion of spray droplets of a splash plate atomizer. Therefore, the upwash formation should be taken into account in the design of an atomizer. The formation of an upwash was experimentally observed under different experimental conditions, and the shape of the upwash was classified. Furthermore, the formation conditions and the shape of the upwash were theoretically analyzed, and the results of the theoretical analysis were verified experimentally. (C) 2016 Elsevier Ltd. All rights reserved.