- Surface and groundwater
- Comparative Climatic Data (for frost heave, rain, etc.)
- Wetland Trail Design and Construction
- Wetland Plant Indicator Status Search
- Drainage Engineering: http://ecoursesonline.iasri.res.in/course/view.php?id=550
- DrainEnvelopes: To Useor Notto Use: https://archive.lib.msu.edu/tic/stnew/article/1999mar12.pdf
- Gradation Design of Sand and Gravel Filters: https://directives.sc.egov.usda.gov/OpenNonWebContent.aspx?content=18397.wba
- Drain calculators
- NDS French Drain Systems