Plauvial drainage project – boca de lobo

Manhole with grid for storm drainage element. Wolf's mouth are devices in the form of collector boxes in masonry or concrete; to be executed next to media-wires or sidewalks; in built-up areas; with the aim of capturing rainwater and directing it to the collecting network. depending on the flow of arrival at the water collection point; simple or compound pitchforks can be made; both with preformed concrete or cast iron grid. So how do you do the sizing of the wolf's mouth for urban drainage? autocad-dwg.