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The USACE has released a new version of HEC-RAS that supersedes versions 5.0.1 and 5.0.2 (which was withdrawn due to major bugs). The new version fixes several bugs and includes new and improved features like culvert inlet/ outlet control, using 2D flow equations at lateral structures, flow and volume time series output for profile lines in RAS Mapper, and profile line point and tick marks. For more info on the new version and to download the model, check out the links below.

Release Notes:...

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Fort Hood has numerous drainage and erosion issues throughout the Army Installation. The Fort Hood Main Cantonment Drainage Master Plan was the third in a series of masterplanning efforts to identify drainage issues and propose alternatives in different areas of Fort Hood. The three masterplanning projects combined cover the entire army installation including North Fort Hood, West Fort Hood and the Main Cantonment.

Each study followed the same steps to develop the Stormwater Capital Improvement Program. The first step was a massive data inventory using survey grade information of...

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Tags2-D Modeling, stormwater planning,

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

Background

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,

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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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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UPDATE: The USACE posted the following update on their website, regarding HEC-RAS Version 5.0.2 - “We've temporarily taken down HEC-RAS 5.0.2 to investigate a critical bug with simplified physical breaching computations. We will be releasing a 5.0.3 soon to fix this issue. We apologize for any inconvenience that this might cause. If you need to download HEC-RAS in the meantime please use the 5.0.1 download links available in the archived versions section below.”

Original Post: The USACE has released a new version of HEC-RAS that...

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The Texas Pollutant Discharge Elimination System (TPDES) Multi-Sector General Permit (MSGP) TXR050000 regulates the discharge of stormwater runoff associated with industrial activities. The new 2016 MSGP for industrial facilities has been issued with an effective date of August 14, 2016.

Does this apply to you?

If you are a regulated industrial sector and you discharge stormwater associated with industrial activity into stormwater conveyances (e.g., gutters, streets, ditches) or into surface water in the state (e.g., streams, ponds, lakes, wetlands...

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Kim Patak and Will Huff, Stormwater, Austin, presented a brownbag to 41 TxDOT area engineering staff in June related to stormwater detention analysis. Kim presented the basics of detention analysis, different methodologies and criteria, and software packages available to assist designers. Will presented a case study for Freese and Nichols’ Bee Cave Parkway project comparing a pond design using the modified rational and unit hydrograph methodologies. Although the unit hydrograph...

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