1. By Maria Nguyen
& Elmerico Carlos
Sept. 16, 2015

2. INTRODUCTION
The Storm Water Catchment Area Project has 2 major activities:
PHASE I: Delineation of the Storm Water Catchment Areas for the MS4 Outfalls under LACFCD jurisdiction pursuant to the 2012 NPDES Permit. Phase I was completed December 2014.

3. INTRODUCTION
PHASE 2: Create GIS data by mapping and creating attribute table for the drainage areas of Design Division’s Engineering Hydrology Study Maps. The drainage areas are the basis for the delineation of the Storm Water Catchment Areas.

4. PHASE I ACTIVITIES
Data source: stream lines, sub-watershed, outlet points data from Water Resources Division (about 40% of the LACFCD).
Completed catchment areas in the following watersheds: Santa Clara River, Malibu, Ballona Creek, Arroyo Seco, La Mirada Creek, Milan Creek, Los Cerritos Channel, Wilmington.
Total catchment areas mapped: 239,160 acres
Total number of MS4 outfalls: 220 (> or = 3 feet diameter)

5. Phase I

6. Phase I

7. SANTA CLARA RIVER CATCHMENT AREAS
Phase I
SANTA CLARA RIVER CATCHMENT AREAS

9. PHASE I ACTIVITIES
The Storm Water Catchment Area data is published on the Los Angeles County GIS Data Portal:
The Storm Water Catchment Area maps are located on the DPW ftp site

10. PHASE II ACTIVITIES
Source: Scanned Hydrology study maps from Design Division
Backdrop base layer: DPW Cadastral Landbase
Completed drainage areas: Within Dominguez and Los Angeles river watersheds.
Total completed drainage areas: 107,779 acres
Total number completed projects: 126
Total number of hydrology study maps: 136
Attribute table: includes project no., drainage map name (if available) and drainage id (if available).

11. Phase II

12. Sample of Scanned Hydrology Study Map Project No. 464
Phase II

13. Phase II

14. Phase II
GIS Drainage Area Map

15. GIS Drainage Area Map Project 464
Phase II
GIS Drainage Area Map Project 464

16. PHASE II ACTIVITIES
The Drainage Area Maps and the Storm Water Catchment Area Project Report are located on the DPW ftp site

17. County of Los Angeles - Department of Public Works
Thank you
County of Los Angeles - Department of Public Works
Maria Nguyen
& Elmerico Carlos