The wireless backbone of the WMN poses several constraints on the amount of traffic that can be transferred through the network. In this paper we present an investigation of the WMNs topology effect on the capacity of these networks. Three different topology types were considered: square, triangle, and hexagon. These topology configurations can be used as a starting point in the initial design of a new WMN. The study shows that a triangle-based topology leads to higher capacity of the network. We also provide guidelines on when a new gateway should be introduced to increase the capacity of the network.