All FEMA effective models for Harris County are available through the M3 system. Links to download these models can be obtained by navigating to the ‘Downloads’ page. The M3 System tracks all FEMA CLOMR and LOMR submittals. These submittals must comply with the HCFCD Hydrologic and Hydraulic Modeling and Management Standards. Refer to the read-me file in each model directory for the official software version. The use of different software versions other than the official version of any model must be pre-approved by the Harris County Flood Control District. For general guidance regarding hydrologic and hydraulic methodologies utilized in Harris County please download the HCFCD Hydrology and Hydraulics Guidance Manual.
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