U.S. Geological Survey Resources USGS guidelines, publications, and statistics.

Data and Reports

Hydraulics Resources

Guidelines for Drainage Studies
Guidance in the methods, procedures, policies, and criteria for Drainage Studies and Hydraulic Design.
Highway Stormwater Program (HSP)
Highway Stormwater Program products and useful links
Hydraulic Forms and Checklists
Forms, Checklists and Resources
Hydraulic/FEMA Coordination
Meeting information, forms, submittals, requests, and other resources.
Resources for Geopak Drainage
Guidelines and instructions for Geopak Applications.

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