Snow affects drainage systems by:
1. Melting snow can overwhelm drains, causing flooding.
2. Snow buildup can block drains, leading to water pooling.
3. Frozen snowmelt can block pipes, causing backups.
4. Heavy snowmelt can overload combined sewer systems, leading to sewage overflows.
5. Rapid snowmelt can cause erosion, risking infrastructure stability.
In summary, snow can cause drainage problems like flooding, blockages, and infrastructure damage, requiring proper management to prevent issues.