
		Capital Improvement Program

		Major Projects

		Major Studies

		FloodWise

		Geographic Information Systems

		Greens Bayou Wetlands Mitigation Bank

		Home Buyout

		Model and Map Management System Home M3 Register M3 Tracked Project Information Only

		Property Management

		Stormwater Quality

		Trails and Our Bayous

		Tree Planting Program

		TS-Allison Recovery Project

		Vegetation Management

		Watershed Environmental Baseline Program

Model and Map Management (M3) System

The Harris County Flood Control District’s Model and Map Management (M3) System is an interactive tool designed to manage changes to the Federal Emergency Management Agency’s (FEMA) effective floodplain models for Harris County. The goal of the M3 System is to distribute FEMA effective models to the general public, track ongoing changes to the models resulting from development projects, and facilitate communication between FEMA, Harris County Flood Control District, Local Floodplain Administrators, and the community. For more information regarding the M3 System please contact M3 Customer Service.

Floodplain Model and Supporting Data Request

To check out FEMA effective models, please select from the following options below.

Informational Model Request

Request models for research purposes or analysis of development projects located entirely outside of the FEMA regulatory floodplain.

M3 Model Request

Request models for analysis of development projects located in the FEMA regulatory floodplain and/or preparation of FEMA Letter of Map Change Submittals.

Notice

1.		The hydrologic (HEC-HMS) and hydraulic (HEC-RAS) models on the DVD titled "FEMA Revised Preliminary Flood Insurance Rate Maps" are no longer valid, and all FEMA effective models for Harris County are available through the M3 system.
2.		All FEMA submittals for development projects tracked by the M3 System must comply with the HCFCD Hydrologic and Hydraulic Modeling and Management Standards.
3.		The official model software versions are HEC-HMS 3.3.0 and HEC-RAS 3.0.1. The use of different software versions must be pre-approved by the Harris County Flood Control District.
4.		For general guidance regarding hydrologic and hydraulic methodologies utilized in Harris County please download the HCFCD Hydrology and Hydraulics Guidance Manual.

Downloads

FEMA Modeled Streams (PDF, 985 KB, 06/18/2007)

HCFCD H&H Modeling Standards (PDF, 448 KB, 12/08/2009)

HCFCD Hydrologic & Hydraulic Guidance Manual (PDF, 36.9 MB, 12/21/2009)

HEC-HMS 3.3.0 (ZIP, 46.5 MB, 10/09/2008)

HEC-RAS 3.0.1 (ZIP, 19.8MB, 07/06/2007)

To download and save a file to disk:

PC:Right-click the link and choose the option, "Save Target As..."
Mac:Control-click the link and choose the option, "Download Link to Disk"