Virginia Tech, Extension Service2019-06-242019-06-241946-04-12http://hdl.handle.net/10919/90538Close-up of same as No. 3, showing sharp crested V notch insert in weir. G.D.E. 10.824 x 5 inchesimage/jpegIn CopyrightApplied ScienceAgricultureVirginia Extension - Project 10Soil and Water ConservationLand DrainageWatershedPhotographBiological Systems Engineering, Virginia Tech