What is a potential risk of not marking out storm drains during excavation?

Not marking out storm drains during excavation can lead to significant damage to existing pipes. When excavation occurs without proper identification of underground utilities, workers may inadvertently hit or break storm drain pipes. This can result in costly repairs, potential service disruptions, and environmental issues, such as water contamination or drainage problems. Properly marking utilities before starting excavation is crucial to prevent such damage, ensuring the integrity of public infrastructure and safety for workers.