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HEC-RAS Modeling Series: Modeling a Steady-State Floodway in HEC-RAS

This article is the first in our blog series on HEC-RAS modeling. Be sure to check back for subsequent series articles.


The Federal Emergency Management Agency (FEMA) regulates development within the 100-year floodplain by administrating the National Flood Insurance Program (NFIP). Communities that participate in the NFIP must prevent excessive development within the floodplain that could cause increases in potential flood damage. FEMA also does not allow development to occur within the floodway, which has a maximum allowable surcharge of...

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TagsHEC-RAS, Floodway, floodplain, 100-year flood, FEMA,


While there were small pockets of improvement, generally, drought conditions across the U.S. either persisted or worsened over the past week. Much of the West and parts of the southern Appalachian region and the Northeastern U.S. are suffering from drought. The middle third of the U.S. is less impacted.

Drought conditions in Texas improved again this week. Less than five percent of the state is even considered abnormally dry, which a welcome classification in September in Texas. Less than one percent is...

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TagsCurrent Drought Conditions, Drought Index, Drought Maps, Drought Monitor, Drought Response, Drought Restrictions, Groundwater, Historical Data, reservoir levels, streamflow,


ENSO neutral conditions continued to prevail last month, causing the prediction to shift from favoring La Niña to slightly favoring the continuation of ENSO neutral conditions. The 2016-17 fall and winter in the northern hemisphere has a 55 to 60 percent chance of remaining ENSO neutral. Read more

The National Oceanic and Atmospheric Administration (NOAA) U.S. Seasonal Drought Outlook map was updated and now covers September through the end of 2016. In the...

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TagsLa Nina, Forecasts, Drought Outlook, Drought Maps, Climate,

Recent Honors and Recognitions

David Sloan, Water and Wastewater Treatment, Fort Worth, was selected by WateReuse Texas as a recipient of the 2016 Ed Archuleta Award.

The award recognizes those who have made outstanding contributions in the field of water reuse within the State of Texas through the significant advancement of reuse, and who have demonstrated leadership in the reuse field. David received the award at the...

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Imagine a Day Without Water and Discover the Value of Water

By David Jackson, Freese and Nichols Vice President/Principal and President of the Water Environment Association of Texas, and Julie Nahrgang, Executive Director of the Water Environment Association of Texas

These days, the need for safe, clean water seems to always be a news topic. At home in Texas, we have...

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Five Presentations at TFMA Fall Summit

Freese and Nichols is proud to attend and sponsor the 2016 Texas Floodplain Management Association Fall Summit in Austin! If you're attending, we hope you can catch our presentations:

Thursday, Sept. 8

2:00 p.m. | Track A - Floodplain Management
A1 - Building a Stormwater CIP at Fort Hood
Lynn Schaub, CPESC, DPW Engineering, Fort Hood, TX; Thomas Caffarel, P.E., CFM; Freese and Nichols; Katie Hogan, P.E., CFM; Freese and Nichols; Evan Burn, EIT, CFM; Freese and Nichols

2:00 p.m...

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HEC-HMS Version 4.2 Released

The USACE has released a new version of HEC-HMS that has several new capabilities including forecast baseflow automatic initialization, forecast reservoir automatic initialization, uncertainty analysis empirical distribution, annual pattern evapotranspiration and compute to a point. Additionally, several existing features were changed and problems were repaired. For a more detailed description of the changes and to download the model, check out the links below.

Release Notes: ...

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Two Projects Receive ENR Honors

Two Freese and Nichols projects have been named to ENR Texas & Louisiana's 2016 Best Projects. The Center for Excellence in Energy Technology at Tarrant County College was named the region's Top Green Project, and Moody Bridge on the University of...

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