You have a paved riverbed system to get rid of moderate rains which periodically occur. That will be insufficient for a 100-year flood (~1000 acres underwater

You have a paved riverbed system to get rid of moderate rains which periodically occur. That will be insufficient for a 100-year flood (~1000 acres underwater by current mapping), and a 200-year or 500-year flood would put significant fractions of the city underwater. https://eng2.lacity.org/projects/LARIVER_Glendale_Narrows/docs/USACE_PowerPoint_Presentation_Slides_17October2016.pdf https://eng2.lacity.org/projects/LARIVER_Glendale_Narrows/do...