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Erosion and Sediment Pollution Control Program Manual.pdf

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STANDARD CONSTRUCTION DETAIL # 9-2<br />

Riprap Apron at Pipe Outlet without Flared Endwall<br />

Adapted from USDOT, FHA HEC-14<br />

NOTE: This table is intentionally blank <strong>and</strong> should be filled in by the plan preparer.<br />

OUTLET<br />

NO.<br />

PIPE<br />

DIA<br />

Pd<br />

(IN)<br />

SIZE<br />

(R-__)<br />

RIPRAP APRON<br />

THICK.<br />

Rt<br />

(IN)<br />

LENGTH<br />

Al<br />

(FT)<br />

INITIAL<br />

WIDTH<br />

Aiw<br />

(FT)<br />

363-2134-008 / March 31, 2012 / Page 235<br />

TERMINAL<br />

WIDTH<br />

Atw<br />

(FT)<br />

All aprons shall be constructed to the dimensions shown. Terminal widths shall be adjusted as<br />

necessary to match receiving channels.<br />

All aprons shall be inspected at least weekly <strong>and</strong> after each runoff event. Displaced riprap<br />

within the apron shall be replaced immediately.<br />

Extend riprap on back side of apron to at least ½ depth of pipe on both sides to prevent scour<br />

around the pipe.

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