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Division 4

31-28 LEVEES.

Danville Zoning Code · 2026-07 edition · updated 2026-07-09 · Danville

31-28.1 Compliance Requirements.

Adequate levees shall be provided in compliance with Section 31-25.

31-28.2 Toe and Slope Requirements.

For levees used in combination with open channels and waterways, the toe of the levee on the water side shall be placed at least two (2') feet back from the top of the bank of channel or waterway. Levee slopes shall not be steeper than two horizontal to one vertical (2:1).

31-28.3 Top Width.

Top width of outer or circumferential levees constructed for the protection of reclaimed lands shall be not less than eighteen (18') feet.

31-28.4 Earth Embankments.

Earth embankments necessary for protection of any portion of the subdivision from surface waters and not adjacent to open channels or waterways shall have minimum top widths of five (5') feet. Embankments slopes shall be the same as for levees.

31-28.5 Degree of Protection.

The degree of protection for which levees shall be designed shall be as follows:

a. For watercourses and channels, levees shall provide the degree of protection as specified in subsection 31-25.6;

b. For those areas to be protected from waters of San Francisco Bay and San Pablo Bay from the southerly and westerly boundaries of Contra Costa County to the State highway bridge at Carquinez Strait, levees shall provide protection from tides and from waves created by wind action. Tops of curbs shall be not lower than elevation 7.5 U.S.G.S. datum;

c. For those areas to be protected from the waters of Carquinez Strait and Suisun Bay from the State highway bridge at Carquinez Strait to Simmons Point on Chipps Island, levees shall provide protection from tides, flood flows in the Sacramento and San Joaquin Rivers, and waves created by wind action. The basis for flood protection shall be the U.S. Army Corps of Engineers’ standard project flood, approximately equivalent to a recurrence interval of two hundred (200) years. Tops of curbs shall be not lower than elevation 8.5 U.S.G.S. datum;

d. For those areas within the delta area from Simmons Point on Chipps Island to the easterly boundaries of Contra Costa County, levees shall provide protection from tides, flood flows in the Sacramento and San Joaquin Rivers and all waterways tributary thereto, and waves created by wind action. The basis for flood protection shall be the U.S. Army Corps of Engineers’ standard project flood, approximately equivalent to a recurrence interval of two hundred (200) years. Tops of

curbs shall be not lower than elevation 9.5 U.S.G.S. datum.

31-28.6 Approval of Design and Construction.

Approval of the design and construction of all levees within those areas described in subsection 31-28.5b., c. and d., shall be obtained from the U.S. Army Corps of Engineers, California State Reclamation Board, San Francisco Bay Conservation and Development Commission, and any active operating local reclamation district within whose boundaries levees are to be constructed.

31-28.7 Control and Maintenance.

The jurisdiction for the control and maintenance of all required levees shall be as determined by the County, except as to areas where reclamation districts or districts with similar powers have such responsibilities, in which case the district having that responsibility shall present assurances satisfactory to the County that they have the necessary means and will perform the continued necessary maintenance of those levees protecting the subdivision.

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▸ Contents — Danville Zoning Code
Danville Zoning Code
  1. Chapter I
  2. Chapter II
  3. Chapter III
  4. Chapter IV
  5. Chapter V
  6. Part 1 — GENERAL
  7. Part 2 — CARDROOM LICENSES
  8. Part 3 — CARDROOM RESTRICTIONS
  9. Part 5 — SUSPENSION, REVOCATION, CHANGE AND VARIANCE
  10. Part 1
  11. Part 2
  12. Part 3
  13. Part 4
  14. Part 1
  15. Division 1 — FORM AND CONTENTS
  16. Division 2 — SUPPLEMENTARY DOCUMENTS
  17. Division 3 — CHECKING
  18. Division 4 — APPROVAL
  19. Division 1
  20. Division 3
  21. ▸ Division 4
    Overview
    1. 31-14 PLANS.
    2. 31-15 CONSTRUCTION WORK.
    3. 31-16 STREET LIGHTING.
    4. 31-17 SIDEWALKS AND PATHS.
    5. 31-18 UNDERGROUND UTILITIES.
    6. 31-19 CURBS AND GUTTERS.
    7. 31-20 MISCELLANEOUS PROVISIONS.
    8. 31-21 RESERVED.
    9. 31-22 STREETS.
    10. 31-23 SURVEY MONUMENTS.
    11. 31-24 BRIDGE CROSSINGS AND MAJOR THOROUGHFARES.
    12. 31-25 DRAINAGE; MINIMUM REQUIREMENTS.
    13. 31-26 APPURTENANCES IN PUBLIC RIGHTS-OF-WAY.
    14. 31-27 OPEN CHANNELS AND CONDUITS.
    15. 31-28 LEVEES.
    16. 31-29 EASEMENTS.
    17. 31-30 MISCELLANEOUS PROVISIONS.
    18. 31-31 WATER AND SEWERS.
    19. 31-32 FENCES.
    20. 31-35 PLANNING COMMISSION AUTHORITY.
    21. 31-36 PROCEDURE.
    22. Chapter XXXII
  22. Division 1 — INTRODUCTION
  23. Division 2 — SPECIFIC USES AND DEFINITIONS
  24. Division 3 — DEVELOPMENT STANDARDS
  25. Division 4 — PARKING STANDARDS
  26. Division 5 — DEVELOPMENT PLAN REVIEW PROCEDURES
  27. Division 1 — GENERAL
  28. Division 2 — REQUIREMENTS AND STANDARDS
  29. Division 3 — CREDIT; EXEMPTIONS
  30. Division 4 — DISPOSITION OF FEES AND LAND
  31. Division 5 — PROCEDURES
  32. Division 1 — GENERAL
  33. Division 3 — ENFORCEMENT REGULATIONS
  34. Division 1 — NONRESIDENTIAL CONSTRUCTION
  35. Division 2 — RESIDENTIAL CONSTRUCTION
  36. Division 1 — GENERAL PROVISIONS
  37. Division 2 — APPLICATIONS
  38. Division 3 — ADMINISTRATION
  39. Division 4 — PROVISIONS FOR FLOOD HAZARD REDUCTION
  40. Division 5 — FLOOD HAZARD VARIANCE PROCEDURES
  41. Division 2
  42. Division 5
  43. Division 2 — REQUIREMENTS AND STANDARDS
  44. Division 4
  45. Division 5
  46. Division 2
  47. Division 1
  48. Division 2

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