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File #: 20-1050    Version: 1
Type: Agenda Item Status: Approved
File created: 8/4/2020 In control: Board of Supervisors
On agenda: 9/22/2020 Final action: 9/22/2020
Title: Department of Transportation, in cooperation with the Planning and Building Department, recommending the Board adopt and authorize the Chair to sign Resolution 140-2020 to approve updates to the El Dorado County Drainage Manual. FUNDING: Road Fund.
Attachments: 1. A - Approved CRS - Drainage Manual, 2. B - Approved CRS - Resolution, 3. C - Resolution, 4. D - 2020 EDC Drainage Manual, 5. E - REDLINE_Drainage Manual, 6. F - 1995 EDC Drainage Manual, 7. G - DM Runoff Table_2007 Revision, 8. Executed Resolution 140-2020
Title
Department of Transportation, in cooperation with the Planning and Building Department, recommending the Board adopt and authorize the Chair to sign Resolution 140-2020 to approve updates to the El Dorado County Drainage Manual.

FUNDING: Road Fund.
Body
DISCUSSION / BACKGROUND
In Fiscal Year 1989-90, the Board of Supervisors directed the Department of Transportation (Transportation) to begin the El Dorado County Master Plan of Drainage program. The goal of the program was to develop a capital improvement program with a funding mechanism to construct needed drainage infrastructure and to repair and/or replace existing inadequate drainage facilities throughout the County. The first phase of the program was to develop a County Drainage Manual. Storm events in recent years have shown us that our current drainage systems are not meeting the increasing demands of climate change and that we need to move forward with enhanced maintenance and operations upgrades. To that end, Transportation’s Maintenance Division is currently working on a county-wide drainage infrastructure inventory.

The objective of the drainage manual was and continues to be to furnish users with computational techniques and criteria required for the performance of hydraulic analysis and design of drainage facilities within the County. The Drainage Manual is intended to outline procedures necessary to provide uniform methodology in the performance of the analysis and design of these facilities.

The Drainage Manual was completed in December 1994. The document was prepared on the basis of research, development of criteria consistent with state of the art procedures, and actual design experience, and it satisfies the above objectives and intentions. Support materials for procedures in the manual are on file at the Department of Transportation. On March 14, 1995 (Item 22), the Board of Supervisors adopted the El Dorado County Drainage Manual and it has not been updated since.

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