• The webinar draws from the September 2021 Hydrology and Water Resources Symposium paper “Advancing Australian Riprap Sizing Approaches“:

• Here are Krey’s presentation slides:

• View Stanford Gibson’s slides under resources here. Subscribe to Stanford’s YouTube channel and view the demonstration of the new Riprap Calculator in HEC-RAS V6.1 here:

Following are some additional resources highlighted in the webinar:

• FHWA toolbox: https://www.fhwa.dot.gov/engineering/hydraulics/software/toolbox404.cfm

• “Scour Protection Design Criteria for Mine Site Infrastructure” from International Mine Water Association 2020 Proceedings (Page 199)

• Austroads 2013 Part 5 Drainage: General and Hydrology Considerations (login required for free download)
• Austroads 2013 Part 5B Drainage: Open Channels, Culverts, and Floodways  (login required for free download)

• Australian rainfall and runoff guidelines

Our 2021 webinar builds on the Australian Water School’s 100th webinar, “Rocking It!” which was held in 2020 and covered using hydraulic modelling results for rock sizing, presenting a range of riprap sizing methods, including the application of the FHWA toolbox.

Here are some additional resources covered in the presentations and Q&A session:

• pdf version of the PowerPoint presentation: Rocking It Slides
• RAS Solution video tutorial showing how to graphically display indicative rip rap size in HEC-RAS using the raster calculator

• Background to rock sizing equations and other rock sizing documents compiled by Grant Witheridge, Catchments and Creeks

• List and links to FHWA HDS and HEC publications (Hydraulic Engineering Circulars) and HEC software documentation (Hydrologic Engineering Center)

• Free online normal depth calculator with rock sizing: http://hawsedc.com/engcalcs/Manning-Trap.php

• Exciting new feature in HEC-RAS V6.1: The RipRap and Scour Calculator

• Main Roads Western Australia: 2006 Floodway Design Guide

• HEC 14 Hydraulic Design of Energy Dissipators for Culverts and Channels (July 2006)

• HEC 23 Bridge Scour and Stream Instability Countermeasures (Vol. 1, September 2009)
• HEC 23 Bridge Scour and Stream Instability Countermeasures (Vol. 2, September 2009)

• Hydraulic Design of Flood Control Channels: USACE EM 110-2-1601

• USDA Forest Service: Stream Simulation

• NCHRP Report 568: Riprap design criteria, recommended specifications, and quality control

• USACE HEC: 1D vs 2D vs 3D

• FHWA report: Two-dimensional hydraulic modelling for highways in the river environment

• USBR Bank Stabilization Design Guidelines

• U.S. Forest Service: Gravel bed bedload assessment tool (BAGS), flow resistance comparison tool, and other design tools

• Caltrans Highway Design Manual Chapter 870 Bank Protection and Erosion Control

• Bank and Shore Protection in California Highway Practice 1960 [revised 1970, superseded, for historical reference only]

• California Bank and Shore (CABS) 2000 [superseded, for historical reference only]

• At long last, here is the derivation of the Isbash formula that serves as the background for the 1960 California method and the Austroads guidelines

• WSDOT: Standard Specifications (See 9.13 Riprap material and placement specifications)

• The Albert Shields Story by John F. Kennedy (not that JFK!)

• The Legend of A.F. Shields by Marcelo Garcia

Thanks to everyone who filled out the poll questions during the webinar. Here are the results:

Great to see that squashed cars (or “Detroit Riprap“) got a big fat goose-egg…perhaps we have made some improvements in environmental consciousness after all!

Finally, here’s an all-important poll question that we left out. Take the live poll and check the results to see the consensus…or lack thereof:

Thanks for your interest and for your feedback – you rock!

Please subscribe to the Australian Water School mailing list and to the Surface Water Solutions mailing list if you’d like to be kept informed of upcoming webinars and online courses that will cover rock sizing and other water modelling and engineering subjects.

Contact Casey Kramer
[LinkedIn Profile]

Contact Krey Price
[LinkedIn Profile]

View previous webinars here, including “Bridge Scour” and “Roughing It” in which we cover roughness coefficients in hydraulic modelling: