Sutter butte flood control agency supplemental presentation on variances and encroachments
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SUTTER BUTTE FLOOD CONTROL AGENCY Supplemental Presentation on Variances and Encroachments PowerPoint PPT Presentation


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SUTTER BUTTE FLOOD CONTROL AGENCY Supplemental Presentation on Variances and Encroachments. Feather River West Levee Project Project Area C May 24, 2013. Permit 18793-1. Greatly reduces flood risk by remediating through and under-seepage deficiencies

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SUTTER BUTTE FLOOD CONTROL AGENCY Supplemental Presentation on Variances and Encroachments

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Sutter butte flood control agency supplemental presentation on variances and encroachments

SUTTER BUTTE FLOOD CONTROL AGENCYSupplemental Presentation on Variances andEncroachments

Feather River West Levee Project Project Area C

May 24, 2013


Permit 18793 1

Permit 18793-1

Greatly reducesflood risk by remediating through and under-seepage deficiencies

Requires removal of all encroachments which present a public safety risk

Requires removal of all encroachments which negatively impactconstructability

Prioritizes expenditures on highest-risk issues first


Variances

Variances

A lot of Variances? Yes, but...

Variances are for features that already exist in the ground today, not new facilities

Variances are proposed only for features which do not pose a safety of levee integrity issue – those that do are being removed

All variances proposed are related to construction (trench slopes w/ CLSM backfill, positive closure device location), materials, and time variances. – everything that we touch gets better!

Under proposed Title 23 Revisions, many of the Variances would not be Variances at all, but would be in full compliance


Encroachments

Encroachments


Uldc requirements for encroachments

ULDC Requirements for Encroachments

ULDC 7.12.1 - “Recognizing that establishing permits for existing encroachments and/or removing unpermitted encroachments can be a lengthy process, often requiring administrative and/or legal actions by state or federal entities, the following is acceptable for meeting the urban level of flood protection:…”

  • Assess and prioritize risk associated with encroachments

  • Immediately remediate high hazard encroachments

  • Develop a plan to permit or remove low hazard encroachments over time

Under SBFCA’s FRWLP, approximately 90% of encroachments will comply with ULDC and Title 23 by the end of construction.

The remaining are being assessed and SBFCA will adopt a plan for remediation with target dates by December 31, 2013.


Frwlp approach

FRWLP Approach

  • Greatly reduce flood risk by remediating through and under-seepage deficiencies

  • Acquire property rights per ULDC

  • Move farming operations away from levee

  • Cure ALL non-compliant encroachments to meet Title 23 and ULDC requirements


Frwlp approach cont

FRWLP Approach (cont.)

Encroachment Remedial Design Process:

Inventoried & inspected all encroachments

Assessed encroachments for levee safety

Assessed encroachments for levee constructability

Prepared remedial designs to meet Title 23 and ULDC

All findings and remedial designs were presented to the Independent Panel of Experts (IPE), DWR, USACE, and Board staff

All comments and recommendations were resolved and back-checked


Summary of 428 actual frwl encroachments

Summary of 428 ActualFRWL Encroachments

  • 102 – No-issue items: e.g., bike-paths, spur levees, Star Bend Levee, 115KV lines, bridges, items outside levee zone (e.g. orchards in floodway), etc.

  • 3 – Relief Well Systems/Trench Drains (84 wells @ Shanghai Bend, 25 wells @ Star Bend, associated ditches)

  • 10 - Roadways

  • 85 - Dry Utilities (primarily overhead lines within levee zone) electrical & communication

  • 51 – Pressurized up and over pipes (gas, water, sewer)

  • 31 – Gravity pipes (water)

  • 8 – Pressure pipes at grade

  • 1 – Railroad crossing

  • 28 – Unneeded/unused pressure and gravity pipes

  • 17 - CVFPB violations for excavations in the levee

  • 3 – Canals and ditches (Sutter Butte Main Canal (project C), private irrigation ditch (project A), private drainage ditch (project A2)

  • 21 – Supply wells (within 30 feet of landward toe)

  • 68 – Misc. structures (many are ‘after the fact’ permits issued by CVFPB)


Addressing 428 actual frwl encroachments

Addressing 428 ActualFRWL Encroachments

  • 102 – No-Issue Items: e.g., bike-paths, spur levees, Star Bend Levee, 115KV lines, bridges, items outside levee zone (e.g. orchards in floodway), etc.

    • No action required; complies with ULDC and Title 23

  • 3 – Relief Well Systems/Trench Drains (84 wells @ Shanghai Bend; 25 wells @ Star Bend; associated ditches)

    • Repairing; replacing with slurry wall; no further action required

  • 10 – Roadways

    • No action required; complies with ULDC and Title 23

  • 85 - Dry Utilities (primarily overhead lines within levee zone) electrical & communication

    • All will meet Title 23 and ULDC by end of constr.


Summary of 428 actual frwl encroachments1

Summary of 428 ActualFRWL Encroachments

  • 51 – Pressurized up and over pipes (gas, water, sewer)

    • All will meet Title 23 and ULDC by end of Constr.

  • 31 – Gravity pipes (water)

    • All will meet Title 23 and ULDC by end of Constr,

  • 8 – Pressure pipes at grade; all to be upgraded

    • All will meet Title 23 and ULDC by end of Constr.

  • 1 – Railroad crossing

    • Meets Title 23 and ULDC/installing closure structure

  • 28 – Unneeded or unused pressure and gravity pipes – to be removed or abandoned

    • All will meet Title 23 and ULDC by end of Constr.


Summary of 428 actual frwl encroachments2

Summary of 428 ActualFRWL Encroachments

  • 17 - CVFPB violations for excavations in the levee

    • We will fix all excavations by end of constr.

  • 3 – Canals and ditches (Sutter Butte Main Canal (project C), private irrigation ditch (project A), private drainage ditch (project A2)

    • In addition to seepage remediation, SBFCA negotiating maintenance MOU for Canal; ditches to be moved.

  • 21 – Supply wells (within 30 feet of landward toe)

    • 18 wells to be abandoned; 3 small domestic wells TBD

  • 68 – Misc. structures (many are ‘after the fact’ permits issued by CVFPB)

    • All reviewed for compliance with ULDC and Title 23; many to be removed during construction; remainder to be addressed by the plan


Conclusions

Conclusions

  • SBFCA has adopted a strategic, risk-based approach in collaboration with USACE, DWR, and CVFPB staff:

    • 100% of encroachments adversely affecting levee integrity are addressed by construction;

    • approximately 90% of all encroachments will be ULDC and Title 23 compliant via FRWLP construction;

    • the remaining 10% will be assessed, and by December 31, 2013 SBFCA will adopt a compliance plan.


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