The Surface Water Management System in Public Works is more commonly known as the Storm Sewer System. This system is actively in place throughout The City of Hillsboro and includes: 250 miles of storm sewer pipeline, culverts, open ditches, streams, creeks, water quality facilities and wetlands. The Storm Sewer System program is also comprised of three components that make it up which include: compliance, conveyance and treatment.
Preventative measures established to protect surface water include grading and erosion control plan review and site measures. These measures are required to minimize sediment runoff from active construction sites with 500 square feet or more of soil disturbance. The City has adopted standards which require the placement of preventative measures throughout these active sites in order to meet compliance with state (DEQ) and federal (EPA) requirements. By minimizing runoff from active or inactive construction sites the City is ensuring that sediment is not displaced throughout the storm system and transported to our local streams and wetlands.
The storm sewer system was designed to aid in moving surface water off of public and private streets and property in order to prevent localized flooding from rainfall events. As mentioned above, the City has 250 miles of storm pipe, ditches, creeks and water quality facilities that are included in this system and must be maintained. The City manages and ensures that each conveyance component is functioning correctly through quarterly inspections of each public water quality facility and 25% of all private facilities annually. City crews also inspect and rate the condition of each public storm sewer pipe with specialized camera inspection equipment at least once every 8-years and will clean these same pipes once every four years. Additionally, crews actively remove debris from culverts, ditches, and streams to ensure the system is able to flow and function properly. Performing routine and scheduled maintenance throughout the Storm Sewer System is essential in order to prioritize line repairs and/or replacements.
To help treat surface water before it enters our streams and rivers, the City has adopted standards which require the construction of water quality facilities. These facilities are designed to assist in the removal of pollutants from the surface water prior to entering the tributaries feeding our rivers. They are also required when additional amounts of new impervious surface (which aid in surface water run-off) are added due to new development. City inspectors routinely visit each public water quality facility quarterly throughout the City to ensure that each facility is able to function properly, remove invasive species and ensure that native plants survive.
The City's storm sewer system consists of 250 miles of storm sewer public main lines distributed throughout the City that are actively being reviewed for repairs and cleaning to ensure functionality. Laterals extending from homes and private businesses connecting to the public storm sewer main lines are considered private utilities and are the homeowners responsibility to maintain.
Any storm lateral that crosses over more than one property line and has more than one connection to it is considered a public line that the City is required to maintain. These unique combinations do occur throughout the City and also requires the City to have an easement recorded for access with each affected property. These easements can be found on residential and commercial private properties, however they have been established to allow the City to have access to the public storm sewer lines for maintenance purposes. If you have an easement on your private property, please understand that at some point in time the City might need access to this utility to possibly inspect, clean or replace the underground storm line.