IZZARD

IZZARD 26.11. 1904 San Mateo CA/USA 08.07. 1997 Loudoun VA/USA Carl Frederick Izzard obtained the AB degree from Stanford University, Stanford CA, in 1930, and the MS degree in mechanics and hydraulics from Iowa State University, Iowa City IA, in 1940. He joined the Bureau of Public Roads in 1930, first for time and cost studies in highway construction, from 1933 to 1939 as federal aid inspector in Texas, and later until 1949 as drainage engineer. He was then until retirement chief of the Hydraulic Research Division, Bureau of Public Roads, Department of Commerce, Washington DC. From 1970 he was director, Office of development, Federal Highway Administration. He was a Fellow of the American Society of Civil Engineers ASCE, and a member of the American Geophysical Union AGU, and the Highway Research Board. Izzard supervised hydraulic research of culverts, bridges and storm drains. He conducted research on peak discharge and frequency of runoff, developing methods of hydraulic designs for highway drainage structures. He was the recognized authority on the application of hydraulics on highway engineering, publishing reports and papers in professional journals. His 1954 paper is based on the use of stream flow records for determining the size of highway drainage structures. By developing regional flood curves, the peak discharge was estimated for a given frequency, whether or not stream gaging records are available for that particular site. His work also contributed to the improvement of hydraulic designs during construction of the interstate highway system, especially in reducing erosion and flood risks. Izzard realized that water was a concern for government agencies, such that he organized a Surface Drainage Committee for Highways under the aegis of the Transportation Research Board. Under his leadership, the group proved influential in collecting flood data to develop design procedures. Anonymous (1964). Izzard, C.F. Who’s who in engineering 9: 910. Lewis: New York. Anonymous (1997). Carl F. Izzard. Eos 78(39): 419. Anonymous (1998). Carl Izzard had major impact on hydraulics in highway design. Civil Engineering 68(1): 8. P Izzard, C.F. (1946). Hydraulics of runoff from developed surfaces. Proc. Highway Research Board National Research Council, Washington DC 26: 129-150. Izzard, C.F. (1953). Discussion of Importance of inlet design on culvert capacity. Research Report 15-B. Highway Research Board: Washington DC. Izzard, C.F. (1954). Peak discharge for highway drainage design. Trans. ASCE 119: 1005-1015.

JABARA 27.06. 1910 Streator IL/USA 02.09. 1992 Denver CO/USA Melvin (Mel) Andrew Jabara obtained the BS degree in civil engineering in 1931 from Oklahoma State University, Stillwater OK. He then made graduate work in hydraulics at the University of Colorado, Denver CO, in 1937, and further at the Graduate School of Business, Harvard University, Cambridge MA, in 1944. He became in the early 1930s a staff member of the US Bureau of Reclamation USBR, Denver CO, and there was from assistant to chief, Division of Design, head of the Earth Dam Section, and chief of the Hydraulic Structures Branch. He was thereby involved in almost 200 multi-purpose schemes, including the San Luis Pumped Storage Project as the USBR’s largest earth dam. He was a member and later a Fellow of the American Society of Civil Engineers. Jabara had experience in the layout, hydraulic and structural design of spillways, outlet works and other structures of earth dams. A number of factors influence the selection of spillway type, namely topography, geology, hydrology, and the purpose of the dam. The 1973 paper is based on USBR dam designs including both plunge pool stilling basins or flip bucket dissipators. Cavitation damage is reported and repairs and modification of spillway tunnels are described. Flow aeration was reported to be an effective means in the control of cavitation damage. The 1976 paper deals with the design and construction of Scoggins Dam in Oregon State. Aspects including climate, groundwater conditions, and marginal embankment material are considered. Pore-water pressure of almost the height of the completed embankment was observed, but no excessive pressures were recorded in the embankment during construction. Jabara, M. (2014). Melvin Andrew Jabara. Personal communication. P Jabara, M.A., Wagner, W.E. (1961). Design and operating problems on the Glendo Dam high-head outlet works stilling basin. US Bureau of Reclamation: Denver CO. Jabara, M.A. (1969). Tiber Dam auxiliary outlet works. US Bureau of Reclamation: Denver. Jabara, M.A., Legas, J. (1973). Selection of spillways, plunge pools and stilling basins for earth and concrete dams. 11th ICOLD Congress Madrid Q41(R17): 269-287. Jabara, M.A., Harber, W.G. (1976). Problems associated with the construction of Scoggins Dam. 12th ICOLD Congress Mexico Q44(R28): 565-580. Whinnerah, R.W., Jabara, M.A. (1961). Whiskeytown Dam Spillway and outlet works. US Bureau of Reclamation: Denver CO. www.usbr.gov/history/.../HOFFMAN,CARLJ.pdf