A fifteen-inch Advanced Drainage Systems storm drain line terminates at a flared end section discharging into a drainage channel. The outlet area features rock riprap for erosion protection, specified with a D50 of twelve inches and a total thickness of twenty-four inches. The riprap extends across the entire channel flowline and continues one foot up the opposite channel bank. The plan view indicates a two-foot wide apron extending one foot beyond the flowline, with a one-to-two slope transition.
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