Grate inlets (curved vane) 2 ft wide and 3 ft long are to be installed on a highway section for a 5-year return period storm. The width of the pavement is 30 ft and the longitudinal slope is 0.012. The allowable spread for the highway section is 7 ft. The 5- year return period IDF curve is given by i(in/hr)=146/(tc+15), where tc is the time of concentration in minutes. The runoff coefficient of 0.9 can be used for the section. The inlets will be installed in a triangular gutter with a cross slope of 0.022. Manning’s roughness coefficient of 0.016 can be used. Find the spacing between all the inlets.

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