Stormwater Pipe Inspection, Assessment & Rehabilitation Program

Public Works
Associate Stormwater Engineer
🌧️ Program Overview
Protecting Our Watersheds Through Proactive Maintenance
The City of Sammamish maintains a complex stormwater network that protects public safety and local waterways. In 2022, the City Council adopted the 2023–2028 Capital Improvement Plan, launching the Storm Pipe Rehabilitation Program — a data-driven effort to identify, inspect, and address aging or at-risk stormwater pipes.
📊 Stormwater System At a Glance
-
235 miles of pipe
-
64 miles of ditches
-
12,000+ catch basins
-
484 public & 144 private stormwater facilities
🎯 Program Goals
-
Evaluate the condition of stormwater pipes using CCTV inspections
-
Identify and prioritize pipes for repair, rehabilitation, or replacement
-
Support risk-based asset management using standardized scoring systems
-
Maintain the performance of the City’s stormwater system over the long term
🛠️ Key Benefits
-
Prevents pipe failures and sinkholes
-
Reduces flood risk and backups
-
Improves maintenance planning and budgeting
-
Protects Sammamish’s lakes, streams, and critical areas
-
long term
✅ Scope of Inspection
-
Included:
-
Stormwater conveyance pipes and culverts
-
Pipe segments 8 inches to 48 inches in diameter
-
Prioritized by size, age, and material
-
-
Excluded:
-
Pipes under 8 inches
-
Detention structures
-
Phantom flow/minor drain types
-