Receive a Presentation from the Public Works Director regarding the City’s Storm Drain Master Plan

Receive a Presentation from the Public Works Director regarding the City’s Storm Drain Master Plan.

At the September 2019 meeting, the City Council adopted Resolution 2019-064, awarding a Professional Services Agreement to Schaaf & Wheeler Consulting Civil Engineers for the Storm Drain Master Plan (SDMP) for a not-to-exceed fee of $174,910. This Capital Improvement Project was successfully completed on budget last fall.

The purpose of the SDMP was to provide an examination of flooding and drainage risks within the City limits and recommend actions necessary to accomplish appropriate level-of-service and reliability for the City’s storm drain system.

The presentation will review the following:

·         Unknowns and concerns prior to development of the SDMP

·         Physical deficiencies found in the system during the field survey

·         Overview of hydrology and hydraulic models performed to evaluate the drainage system

·         High priority repairs and capacity improvements

·        Anticipated flooding due to 10- and 50-year storms strengthened by climate change by the year 2045

·        Conclusions

Attachment #1 provides the Executive Summary from the SDMP, followed by a map showing the City’s existing drainage infrastructure. The attachment also includes a map showing the locations of recommended repairs and increased capacity projects as well as a table listing the recommended future capital improvement projects totaling $9.9 million that are needed to have a fully functioning system for 10-year storm events.

The SDMP is available on the City's website under the Public Works main page at: complete_final_sdmp_report_september_2020_small.pdf (carmel.ca.us)

There is no fiscal impact to receiving this report. 

The SDMP recommends investing $9.9 million to make repairs to the structural integrity of the drainage system and improve system capacity to appropriately convey a 10-year storm event. These projects have been prioritized in the SDMP and will be included in future year Capital Improvement Programs as funding permits.

At the September 2019 meeting, the City Council adopted Resolution 2019-064, awarding a Professional Services Agreement to Schaaf & Wheeler Consulting Civil Engineers for the Storm Drain Master Plan Projector for a not-to-exceed fee of $174,910.

This presentation was also given to the Climate Committee at their December 2020 meeting.