Santa Clara River Management Master Plan

Los Angeles County, CA

Newhall Ranch is a ± 25,000 acre master planned community comprised of four large villages. PACE is working with Newhall Land and a large team of consultants to prepare EIRs for environmental permitting (404, 401, 1600s & others) and project level EIRs for each of the four villages.  The PACE role includes hydrologic, hydraulic, sediment, and runoff water quality modeling and analysis. The project includes a ± five miles of the Santa Clara River and ± 14 miles of tributaries to the Santa Clara River. Comprehensive analysis has been performed to quantify impact to river hydraulics and river habitat. The modeling includes use of HEC-RAS, BOSS-RMS, GIS, and ACAD to provide detailed depth and velocity distribution analysis and comparison of pre vs. post development conditions for multiple alternative development configurations. Detailed fluvial studies were completed for both the general and long term streambed response utilizing sediment routing models.