A storm drainage headwall profile features an SDDI-6 structure connected to storm drain manhole SDMH number 5. The assembly includes thirty-three linear feet of reinforced concrete pipe measuring eighteen inches in diameter at a slope of four point nine eight percent, carrying a public flow rate of one cubic foot per second. The downstream side incorporates thirty-nine point six nine linear feet of reinforced concrete pipe measuring thirty inches in diameter at a slope of four point two six percent, carrying a public flow rate of five cubic feet per second. An eighteen-inch steel casing houses a pressurized eight-inch dip line maintaining an eighteen-inch minimum clearance. A plug and cap are detailed per detail twenty-nine on sheet C6.6, with existing and finished grade centerlines and a one-hundred-year hydraulic grade line clearly mapped.
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