On Thursday September 29, 2011 Dr. Stephen Silliman from the University of Notre Dame's Department of Civil Engineering and Geological Sciences will present the seminar, Darcy Lecture: Development of Reliable Hydrologic Data Sets in Difficult Environments: Case Studies from Benin, West Africa. Refreshments will be served at 3:30 and the seminar will follow promptly from 4:00 P.M. - 5:00 P.M.