References

http://scholar.google.com/scholar?q=elementary+education+model+of+hydraulic+conductivity&hl=en&as_sdt=0&as_vis=1&oi=scholart&sa=X&ei=zNm3VMiMBYeiyAS2pIGwBg&ved=0CB0QgQMwAA

http://www.iowadnr.gov/Environment/GeologyMapping.aspx

http://www.sws.uiuc.edu/wss/

http://www.iihr.uiowa.edu/igs/useful-links/

http://www.dnr.illinois.gov/WaterResources/Pages/ResMan.aspx

http://pubs.usgs.gov/wri/wri014210/text/07_hydraulic.htm

http://pubs.usgs.gov/wri/wri014210/text/06_data.htm

materials for an elementary class to build there own model:

http://www.sciencebuddies.org/science-fair-projects/project_ideas/Geo_p045.shtml#materials

kids experiments: http://www.juliantrubin.com/fairprojects/earthsciences/water_geology.html