Average Hourly Cost: The average hourly cost for drainage design and installation by a landscape architect in 2023 is approximately $100 - $150 per hour.

Cost Breakdown: The cost of drainage design and installation by a landscape architect typically includes the cost of materials, labor, and other associated costs. The cost of materials can vary depending on the type and quality of the accessories used. The cost of labor is also determined by the complexity of the job and the experience of the landscape architect.

Factors Affecting Cost: There are several factors that can affect the cost of drainage design and installation by a landscape architect. These include the type and quality of the accessories used, the complexity of the job, the location and service provider, and the experience of the landscape architect.