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E1: Vegetation Control and Sediment Removal for Flood Protection

This project supports the District’s ongoing vegetation control and sediment removal activities that reduce flood risk by maintaining design conveyance capacity of flood protection projects. These activities also provide access for maintenance personnel and equipment. The project includes: controlling in-stream vegetation growth, removing sediment at appropriate intervals, removing hazardous trees, and performing weed abatement and pruning to provide access and establish firebreaks. Before carrying out in-stream maintenance, District personnel perform biological pre-construction surveys to minimize environmental impacts. Allocations for Project E1 also helps fund future maintenance of flood protection projects completed under the Safe, Clean Water program.

This project is comprised of 4 sub-projects that support the District's ongoing vegetation control and sediment removal activities. Reference Appendix B in the 5-Year Implementation Plan for project descriptions. These sub-projects are:

E1.1 Vegetation Control for Capacity
E1.2 Sediment Removal for Capacity
E1.3 Maintenance of Newly Improved Creeks
E1.4 Vegetation Management for Access


Benefits

  • Ensures that existing flood protection projects continue to provide maximum flood protection
  • Provides safe access for maintenance of creek channels
  • Reduces fire risk along creeks and maintains compliance with fire codes
  • Improves water quality


Project Status 

(As of September 2017) 

E1.1: Vegetation Control for Capacity
Completed 265 acres of in-stream vegetation management to reduce flood risk on 61 miles of streams throughout the county using an integrated combination of mechanical, hand labor and herbicide methods during FY18 Q1 (July 1 - September 30, 2017).

E1.2: Sediment Removal for Capacity
In FY18 Q1, completed 18 sediment removal projects, 9,796 cubic yards of sediment removed to maintain design capacity. (Note: The quantities reported for this project are inclusive of work performed between June 15th and June 30th, 2017). The Safe, Clean Water Program funds 14% of this work, which equates to approximately 1,371 CY.

E1.3: Maintenance of Newly Improved Creeks
As no Safe, Clean Water flood protection capital improvement projects have yet been completed, no maintenance work was conducted on newly improved creeks in FY18 Q1, and therefore, no expenditures have been made from the $19.1 million identified in the original 15-year plan. These funds will remain set aside for this project.

E1.4: Vegetation Management for Access
Completed 1,139 acres of maintenance access work in all 5 watersheds during Q1 FY18 relative to an annual target of 2,720 acres. Of this total acreage, 15% of the completed work was funded by Safe, Clean Water fro a total of 446 acres towards the 15-year goal of 6,120 acres. 
During the first 4 years of the program, the total accomplishment for the program is 1,786 acres, compared to a 4 year target of 1,632 acres. To date, the program is on target for year 4.



Key Performance Indicator

  1. Maintain 90% of improved channels at design capacity
  2. Provide vegetation management for 6,120 acres along levee and maintenance roads. 
 

Priority E-200

FY17 Annual Report Status 

StatusOn Target
Project StartFY 2014
Project FinishFY 2028
Safe Clean Water
Program funding

$59.2 M**

(2015 Dollars)

**More financial information: 5-Year Implementation Plan, pages: 19-27
LocationCountywide


For more information:

 E1.1 Vegetation Control:
 E1.2 Sediment Removal:
 E1.3 Maintenance of Newly Improved Creeks:
 E1.4 Vegetation Management: 
 

 

Smith Creek Upstream of Granada Way

Before           

Smith Before

After

Smith After