Current / Recent Construction Projects

Transcription

1 Zone 1 Report to the Zone Commissioners By Jason Uhley, General Manager-Chief Engineer November 2017 Current / Recent Construction Projects Monroe MDP - Monroe Channel Stage 4 ( ) In June 2017, the District awarded a $2.5 million construction contract that will replace an end of life, Citymaintained, open channel with District-maintained underground reinforced concrete box. The project will reduce flooding along Monroe Street between California Avenue and Magnolia Avenue, and will accommodate a future City-funded/constructed recreational paseo. This project is currently under construction and is anticipated to be complete in February Construction costs are fully funded by the District. University MDP University Wash Stage 3 ( ) Cooperative project with the City of Riverside to extend the existing University Wash upstream of Spruce Street to the intersection of Massachusetts Avenue and Durahart Street. The District designed the project to contain 10-year storm capacity to reduce flooding along Massachusetts Avenue west of Durahart Street. The design also reduces flooding for businesses near the project alignment. Construction work was substantively completed in September 2017, and the Notice of Completion is being prepared. The project is fully funded by the District. 1

2 Active Design Projects Santa Ana River Stabilization ( ) The project will ensure that existing levees continue to provide protection to the City of Riverside. The USACE is expected to initiate restoration of the federally-constructed reach of the Santa Ana River Levee system downstream of the San Bernardino County line to Tequesquite; exact form of the project not set. Work will likely include repair of groins and toe protection, and be funded by the USACE. In conjunction with the USACE's proposed rehabilitation of the federally-constructed Santa Ana River Levee system, the non-federal segment, which begins at the county line and extends 6,165 feet north into San Bernardino County (shown in blue), may also require major reconstruction. This facility was originally constructed in 1938 by the County of Riverside, prior to the formation of the District. Work will include installation of approximately 6,165 lineal feet of grouted riprap revetment. In 2017, the Corps secured approximately $3 million in funding to begin environmental and design work. The District will continue working with the Corps to identify a feasible solution. 2

3 Sycamore Dam Outlet Modification ( ) The District is the lead for this project. The goal for this project is to construct several upgrades to improve the safety and operation of the Dam. The proposed improvements include the repair and reinforcement of the existing outlet channel; construction of a new debris rack structure; erosion controls on the embankment of the dam; construction of a safer access road into the facility; design for safer routing of flood waters from the emergency spillway to Central Avenue; and the installation of a control section to measure outflow from the outlet pipe of the dam. The project is located within the natural Tequesquite Arroyo Wash floodway. Design for this project is scheduled to start after the completion of the Woodcrest Dam Outlet Modification project. Woodcrest Dam Outlet Modification ( ) The goal for this project is to construct several upgrades to improve the safety and operation of the Dam, including a new grated inlet structure to reduce clogging potential at the outlet works; replacement of the gate assembly and control stem; implementation of an automated gate control system; rehabilitation of the outlet pipe; restoration of the outlet channel; and erosion controls on the embankment slope. Once completed, this project will serve as an example for performing similar upgrades to the remaining Riverside Reservoir dams. Per the recommendations provided by the State Division of Safety of Dams (DSOD), the District is performing additional geotechnical field exploration of the existing spillway and for the installation and operation of piezometers along the Dam for long-term monitoring. Design of the project will continue once the additional geotechnical work has been completed. 3

4 Monroe MDP Line E, Stages 2 and 3 ( , -03) The proposed Line E, Stages 2 and 3 have been combined into one City design-build project, funded by the District. This project will reduce flooding along Gratton Street and Hermosa Drive, as well as Dufferin Avenue within the reaches shown in the exhibit below. The proposed system will be an underground storm drain that will collect stormwater along Hermosa Road and Gratton Street and convey it in an underground storm drain heading northwest along Gratton Street where it will discharge into existing underground Monroe MDP Line E storm drain at Lincoln Avenue. It includes Line E-2 along Hermosa Drive east of Gratton Street and Line E-5 along Dufferin Avenue east of Gratton Street. The District and the City of Riverside executed the cooperative funding agreement on September 12, The City has received mapping and the hydrology report from the District to begin the design work. The City will lead the design and construct the project. Upon construction completion, the District will accept the mainline storm drain for operation and maintenance. 4

5 Jurupa-Pyrite MDP Line A-2, Stage 1 ( ) The District-led project consists of constructing an interim portion of Line A-2 to alleviate flooding hazards to the properties located at the end of Bellmore Street and surrounding the proposed project site. This interim project follows the master drainage plan alignment and collects flows at the southern end of Bellmore Street and conveys the flows westerly under Agate Street. Design mapping and the Project Charter have been completed, and the 90% Plans are currently in progress. The District is currently in negotiations to acquire the right of way required for the construction of the project. 5

6 Water Conservation & Water Quality Flood Control Basin Retrofit Study ( ) District staff continues to meet with regional water agencies in an effort to better understand local groundwater basins and to promote joint stormwater recharge and other water conservation projects. To help locate and prioritize projects, the District is investigating/tracking dozens of existing basin/dam facilities which could be retrofitted to improve stormwater capture and recharge. Box Springs Recharge/Water Quality Retention Basin Retrofit ( ) This project will retrofit an existing retention basin to recharge ground water and improve water quality. The existing basin is located in the city of Riverside at the intersection of 14 th Street and Kansas Avenue. The proposed retrofit includes a new electric outlet gate valve and the removal of soil from the basin invert to create more water storage. The electric outlet gate will help optimize the amount of infiltration by adjusting outflow and maintaining the original intent of the basin which is to reduce peak flows. The potential partners for the project are the City of Riverside and Riverside Public Utilities. 6