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Floodplain Study


WHY IS A FLOODPLAIN STUDY NECESSARY?

The purpose of a floodplain study is to establish the 100-year floodplain limits within or near a development in order to preserve the natural resources within the 100-year floodplain, to protect property and persons, and to apply a unified, comprehensive approach to floodplain management.

WHEN DO I NEED A FLOODPLAIN STUDY?

A study is required for any subdivision activity in Montgomery County that includes or is close to a drainage way having a contributing drainage area of 30 acres or greater.

HOW DO I ESTABLISH THE 100-YEAR FLOODPLAIN?

The 100-year floodplain can be established using the following:

  1. Detailed floodplain - MNCPPC floodplain maps; Federal Emergency Management Administration (FEMA)FIRM maps, or Flood Boundary and Flood way Maps; and DPS approved engineered floodplain studies.
  2. Approximate floodplain - Floodplain areas in the County where a detailed study has not been performed, but where a 100-year floodplain boundary has been approximated.
  3. Unstudied area - Areas not identified in item #1 or #2.

For developments where floodplain limits fall under items #2 and #3, an Engineered Floodplain Study will be required as part of the development plan approval.

WHAT IS THE APPLICATION APPROVAL PROCESS?

Submit a completed Floodplain District Permit Application with appropriate supporting information (a development plan, and any supporting technical information) and appropriate application fees. The owner of the property where the land-disturbing activity is to be performed, or the owner's authorized agent, must sign the application .Please refer to the second page of the FPDP Application for submittal requirements.

WHAT WILL THE FLOODPLAIN STUDY REVIEW COST?

Fees associated with the Floodplain Study are in accordance with Schedule of Fees for Permits Licenses and Inspections – Method 3  and is required for all Floodplain Study applications. An additional 5% Automation Enhancement Fee is charged on the cost(s) listed above as per Montgomery County Regulation 13-13 - Adoption of an Automation Enhancement Fee.

 

WHEN WILL I RECEIVE MY FLOODPLAIN STUDY APPROVAL?

An engineered floodplain study takes approximately six to eight weeks for review and approval. The actual processing time may vary according to workload and/or complexity of the project.

WHAT NEXT?

Upon the approval of the floodplain study, the applicant can apply for a Floodplain District Permit if the development proposes to construct within the 100-year floodplain. All approved floodplain limits must be shown on the subdivision record plat prior to recordation.

 

 

Application Package
Floodplain District Permit Application Floodplain District Permit Application
Dam Breach Analysis Information Dam Breach Analysis
Sediment Control Permit Application Sediment Control Permit Application
Sediment Control Permit Information Sediment Control Permit
Stormwater Concept Application Stormwater Concept Application
Fees and Taxes
Fees for Floodplain District Permit (See page 7) Executive Regulation 15-13
Automation Enhancement Fee Regulation (5% Automation Fee) Executive Regulation 13-13
Credit Card Authorization Form Credit Card Authorization Form
Codes, Standards, Executive Regulations
Montgomery County Code - Chapter 19 Montgomery County Code
Guidelines, Memorandum of Understandings, Interpretations
Water Resource Section Standards, Guidelines and Helpful Information DPS Water Resources Section Guidelines
Stormwater Management Concept Information Stormwater Concept
Inspection Requirements
Sediment Control and Stormwater Management Inspections Sediment Control Inspections
Frequently Asked Questions
311 Web Portal: Enter key word "Floodplain" http://www3.montgomerycountymd.gov/311
Online Permitting Status Information and Inspections
Online Permit Status Search DPS
Applicants with Contact ID Sign In Sign In
Call for More Information
In Montgomery County 311
Outside of Montgomery County 240-777-0311
Other Agencies to Contact
Other Agencies and Utilities to Contact Allegheny Power
  Baltimore Gas & Electric Co. (BG&E)
  Board of Appeals
  Maryland Department of the Environment
  Miss Utility
  Montgomery County Department of Environmental Protection (MCDEP)
  MNCPPC: MC Atlas
  MNCPPC: Zoning
  MNCPPC
  Montgomery Soil Conservation District
  Potomac Electric Power Company (PEPCO)
  Verizon
  Washington Gas Light Co.
  WSSC