Storm Drainage

CP&P manufactures and supplies an extensive line of storm drainage products meeting requirements of numerous governing jurisdictions.

Box Culvert

Multiple formwork allows CP&P to provide box culvert in both single cell and monolithic multiple cell sections. Precast headwall and wing-wall systems are typically supplied with the box culvert reducing the labor costs associated with field forming and placing of concrete. Culvert sections are typically manufactured according to AASHTO, state departments of transportation, and ASTM C1577 standards.

Pipe Fittings

CP&P manufactures Tees, Wyes, Bends, and Reducers in various shapes and sizes. For specific information about reinforced concrete pipe sizes and/or specifications, please contact your sales representative.

Trench Drains

Trench drains are engineered to suit each individual layout configuration. Varying lengths and depths can be provided for widths up to 24”.

Pond Risers

Pond risers are sized as necessary and engineered for site specific conditions. Care is taken to meet required safety factor for anti-flotation. In most cases, trash racks, anti-vortex devices, and/or orifice plates can be supplied with the structure.


CP&P manufactures RCP in sizes 12” through 96” in classes III, IV, and V, meeting ASTM C76. Special designs are available for deep fill or other high loading conditions. CP&P offers several joint types including single offset, o-ring and tongue and groove to handle the wide variety of storm sewer needs.


CP&P manufactures a wide variety of sizes – ranging from 48” to 144” inside diameter – to suit many applications and provide connections for various pipe sizes and configurations. Circular components, at a minimum, meet the requirements of ASTM C478 and AASHTO M 199.

Manhole Steps

Steel reinforced copolymer polypropylene steps are typically used in our precast products conforming to the following specifications:
• ASTM C478 (Manhole steps)
• AASHTO M 199 (Manhole steps)
• OSHA STD 1-1.9 (Manhole steps)
• Federal Specification RR-F-621E (Non-sparking manhole steps)


Straight wall or multiple face wall systems are available. Openings can be provided for single or multiple pipes and opening sizes are engineered to accommodate skewed pipes when necessary. Custom openings can be provided (e.g., rectangular weir openings for storm water management applications).

Drop Inlets

Precast concrete tops are cast integrally with access covers and/or drainage grates when required to suit various applications. CP&P produces and stocks an array of DOT Standard drop inlets.


A broad range of standard sizes is manufactured for typical applications. Custom sizes or multiple chamber boxes are engineered to meet site or function specific applications. Boxes can be manufactured to serve as junction chambers or vaults for use in water, sanitary, or storm systems. Box components meet or exceed the requirements of ASTM C858 and ASTM C913.

Access and Inlet Castings

CP&P supplies a diverse line of manhole and inlet frames, covers, grates, hatches, and miscellaneous hardware.

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