Construction of the HDOT Highways Kawainui Watershed Storm Water Best Management Practices project was completed in the spring of 2016. The overall goal of this project is to reduce sediment erosion into the HDOT Highways storm water system. This project included the repair and remediation of five eroded slopes located within HDOT Highways rights-of-way that have the potential to contribute sediment to storm water runoff. Additionally, the project included the construction of a new storm water treatment settling basin at the inlet to a storm water pipe that was previously completely buried in sediment. This settling basin is a Permanent BMP designed to capture sediment and leaf litter so it can be removed by HDOT Highways maintenance crews before it has a chance to enter the storm water system. The successful construction of this project was managed by HDOT Highways Salt Lake field office.

Slope Repair

Click on the photos below to learn more about the slope repair process.

This eroded slope adjacent to the H-3 Freeway is being prepared for the application of hydro-mulch and grass seed.
Application of the hydro-mulch and grass seed mixture.
This completed site has newly planted grass growing through erosion control fabric where there was previously a bare slope.

Settling Basin

Click on the photos below to learn more about the settling basin.

This storm drainage pipe was completely buried by eroded sediment. In this photo the construction crew is excavating the eroded sediment to expose the pipe inlet.
Construction of the new inlet structure and settling basin.
The completed settling basin was designed to capture sediment and leaf litter so it can be removed by HDOT Highways maintenance crews before it has a chance to enter the storm water system.