The budget for this project can be estimated based on the scope of work and the materials required. The project involves the construction of a concrete drainage channel, excavation, and installation of bank and channel protection gabions. The total cost of the project will depend on the complexity of the work, the location, and the contractor's expertise. Assuming an average cost of $100 per cubic yard of excavation and $50 per linear foot of steel guardrail, the total cost for Site A would be approximately $26,100 for excavation and $11,875 for steel guardrail, totaling $38,000. For Site B, the cost would be approximately $8,900 for bank and channel protection gabions, $11,000 for excavation, and $3,750 for turf reinforcement mat, totaling $23,650. The total estimated cost for the project would be around $61,650. However, this is a rough estimate and the actual cost may vary depending on various factors such as labor costs, equipment rental, and other expenses. The budget range can be estimated as $50,000 to $100,000, considering the complexity of the project and the potential for additional costs.