Trigon is the prime engineer for study, engineering, design and construction services for $3M of Hazard Mitigation drainage work.
Consists of evaluating a 100+ acre drainage basin – multiple open canals and ditches (approximately 3,000 LF), culvert crossings of major roadways and railroads, subsurface drainage, and a temporary pump station. Included necessary surveying and data collection, a hydrologic and hydraulic (H&H) study, identification of improvements, preparation of a preliminary cost estimate, and preliminary and final engineering design services. Preliminary design was recently completed
Improvements generally include:
• Replace surface and subsurface system (inlets, catch basins, pipes) along two residential/ commercial streets.
• Construct weir/overflow structure, new concrete channel and box culvert, suction basin and 60 cfs pump station with Parish-owned submersible pumps.
• Clean numerous culverts clogged with debris.
• Clean/re-grade multiple earthen ditches and canals.
• Install new 54-inch culvert under major roadway via trenchless method.
• Replace multiple culverts from 18 to 72 inches in size.
• Replace failing steel sheet pile wall with new structure.
• Install multiple box culverts, 6’ x 6’ to 10’ x 6’ in size.
Services provided as part of this project include:
• Study & Assessment—H&H study to assess existing hydraulic capacity, identify corrective measures to handle 10-, 25-, 50- and 100-year storm events, and prepared a report summarizing results and conceptual-level cost estimates.
• Preliminary Design—refinement of remedial measures, construction contract packaging, development of a Preliminary Design Report, and refined cost estimates.
• Final Design—preparation of detailed plans, specifications and cost estimates.
• Bid Phase Services—advertisement of contract, pre-bid conference, addenda preparation, bid tabulation and award recommendation.
• Engineering Services During Construction—review of submittals/shop drawings and responding to contractor requests for information and clarifications.
