Grading, Flood, & Storm Water

Instructions and Forms related to Grading, Drainage, Flood, & Storm Water for Permit Sonoma.

Additional instructions and forms related to:

• Grading Plan Check

• Grading Permit Application Requirements

More information about Grading & Storm Water

Instructions and Forms

• CNI-026 Flood Damage Electrical Circuit Megohmmeter Testing Form (PDF)

  To check the condition of conductor insulation using a minimum 500v DC megohmmeter. This test must be performed by a licensed electrician on all inundated, and not yet replaced power and control circuits. (PDF: 256 kB) (Revised 10/10/2018)

• CSS-019 Minimum Standard Site Plan Requirements

  Minimum standard site plan requirements for most applications at Permit Sonoma. (Planning applications have different site plan requirements.) (Revised 12/09/2020)

• CSS-020 Building Permit Application - Revised Information  (PDF)

  This form must be completed when there has been a change in owner or contractor on an issued building or grading permit (PDF: 310 kB) (Version 05/29/2020)

• DRN-003 Roiling Permit Application (PDF)

  The instructions and form are required to apply for a roiling permit. A roiling permit is required prior to performing the types of work described on the application form.  (PDF: 223 kB) (Version 02/24/2022)

• DRN-005 Waterway Setback Requirements

  This document summarizes waterway setback information from assorted sections of the Sonoma County Code (SCC). When multiple setbacks apply to a waterway, the most protective setback shall generally govern land use and development. (Revised 01/31/2019)

• DRN-006 Drainage Report Required Contents

  Drainage reports shall be prepared with sufficient clarity to indicate the nature and extent of proposed drainage improvements. (Version: 03/08/2024)

• GRD-002 Grading Permit Questionnaire (PDF)

  Use this Questionnaire to assist in determining when a grading permit is required. (PDF: 304 kB) (Version 05/27/2020)
  Use with Flood Prone Urban Area (FPUA) Map.

• GRD-004 Grading Permit Required Application Contents

  Lists submittal requirements for grading permit applications and a checklist for grading plans. (Version 03/08/2024)

• GRD-005 Grading Permit Supplemental Information (PDF)

  Supplemental information about the proposed grading work to Permit Sonoma staff in order to assess appropriate fees, determine grading designation, establish a contact person for a grading permit application, and perform the site evaluation.  (PDF: 319 kB) (Revised 05/27/2020)
  
  Use with Flood Prone Urban Area (FPUA) Map.

• GRD-008 Grading Permit Required Inspections (PDF)

  Identifies grading permit inspections required to be performed by Permit Sonoma inspection staff and, when applicable, by the project civil engineer and soils engineer.  (PDF: 332 kB) (Version 04/10/2020)

• GRD-009 Grading & Drainage Inspection Notes

  These notes provide information on the County’s requirements for inspections related to grading and drainage work. (12/16/2020)

• GRD-010 Grading & Drainage Notes

  These notes provide information on the County’s requirements for performance of work related to grading and drainage activities. (12/16/2020)

• GRD-011 Erosion Prevention & Sediment Control Notes

  These notes provide information on the County’s requirements for erosion prevention and sediment control during building and construction activities. (12/16/2020)

• NPD-002 Protection of Stormwater Quality on Construction Sites

  Information for owners and contractors regarding their responsibility to protect stormwater quality during construction and recommendations for protecting stormwater quality. Responsible and proper construction management at the job site is essential for the protection of stormwater quality. (Version 03/16/2023)

• NPD-003 State Water Resources Control Board General Permit Requirements

  The purpose of this document is to provide information to the development community on their responsibility to protect stormwater quality during construction and to inform them of the State Water Resources Control Board’s General Construction Permit requirements for construction projects disturbing one (1) or more total acres of soil. (Version 03/16/2023)

• NPD-007 Best Management Practices for Construction Sites

  The purpose of this document is to provide information about Best Management Practices that construction site managers shall implement to keep pollutants from entering the storm drain system or nearby waterways. (Version 03/16/2023)