A reinforced concrete drainage box supports a curb inlet frame, grate, and curb box matching model D&L I-3517 or equivalent. The concrete walls are reinforced with number 4 bars spaced at ten inches on center typically in each wall. The base slab is eight inches thick and reinforced with number 4 bars at twelve inches on center, tied with number 4 dowels at twelve inches on center all around. The inlet box dimensions vary up to a maximum depth of five feet, with a variable throat width per inlet requirements.
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