Project Overview
JLC Engineering & Consulting was contracted to design and analyze the storm drain system for Line 16 as part of the Beaumont Master Drainage Plan (MDP). The purpose of the project was to create a stormwater drainage solution that would intercept and convey stormwater flows from a 570-acre watershed area, ultimately directing runoff to the Noble Creek Recharge Basin Facility (NCRF-Ph II). The project aimed to manage runoff from both existing and future (ultimate) conditions, ensuring compliance with Riverside County Ordinance 460, which requires that:
- The 100-year storm event remains within the road right-of-way.
- The 10-year storm event remains within the street curb section.
The storm drain system was designed to handle the 10-year storm event, ensuring that flooding in residential streets is minimized while allowing for future upstream storm drain extensions.
Study Area & Drainage Conditions
The Line 16 Storm Drain System intercepts flows from an area primarily composed of rural residential lots and undeveloped land. The existing watershed lacked storm drain infrastructure, and runoff previously traveled as sheet flow, collecting in streets such as Jonathan Avenue, Winesap Avenue, Cherry Avenue, and Noble Street before discharging into Marshall Creek. The project would significantly improve drainage by capturing stormwater at key intersections and routing it through an underground storm drain system.
Analysis & Methodology
JLC Engineering conducted hydrologic and hydraulic analyses to evaluate the storm drain system’s design and performance.
- Hydrology Analysis:
- A local hydrology study was performed to determine how much runoff the proposed laterals and connector pipes needed to intercept.
- The Rational Method was used to estimate flow rates for both proposed and ultimate conditions.
- Hydraulic Analysis:
- Street flow capacities were calculated for several key roads, using topographic data and field observations.
- Catch basin analyses were performed to determine the optimal placement and sizing of storm drain inlets.
- Water Surface Profile Gradient (WSPG) modeling was used to analyze the performance of the storm drain pipes, ensuring they could handle the required flow rates.
Key Findings & Results
- Improved Flood Management: The storm drain system was designed to effectively capture and convey stormwater, reducing the risk of flooding in key intersections and residential streets.
- Future-Proof Design: The system accounts for future development and planned infrastructure, ensuring that it can integrate seamlessly with future storm drain expansions.
- Efficient Stormwater Capture: Strategic placement of storm drain inlets and pipes ensures that runoff is intercepted at critical locations, maximizing drainage efficiency.
- Enhanced Water Management: The project supports groundwater recharge efforts by directing excess stormwater to the Noble Creek Recharge Basin Facility, contributing to sustainable water management.
- Compliance with Local Standards: The design adheres to Riverside County’s regulatory requirements, ensuring that stormwater is managed effectively and safely within public rights-of-way.
Conclusion
JLC Engineering successfully completed a comprehensive hydrologic and hydraulic analysis for the Line 16 Storm Drain System in Beaumont, CA. The study ensured that:
- The storm drain system was adequately sized to handle peak flows.
- Future expansion was accounted for, ensuring long-term functionality.
- The design maximizes stormwater interception, reducing flood risk in the watershed area.
The Line 16 system represents a critical drainage improvement, mitigating flooding while enhancing groundwater recharge through the existing Noble Creek Recharge Basin Facility.