Private or public storm drain plans are both possible. There are storm drain lines within the project boundaries that have been made public. It is common practice to use PVC pipes that are capable of discharging at a level acceptable to California city engineers. You can use the street curb, a public storm drainage system, or distribute the waste on-site in an environmentally friendly manner. Public storm drains necessitate the expansion or replacement of existing lines. Reinforced concrete pipes are commonly used for public storm drains. A hydrology analysis is undertaken for both private and public purposes to determine the flow and build the pipes to withstand a 50-year or 100-year rain event. The hydrology analysis for public storm drain schemes is often more complex in highest level engineering, as the watershed region may include numerous converging sub-areas.