DOBSON 27.02. 1881 Philadelphia PA/USA 29.12. 1945 Tulsa OK/USA Gilbert Colfax Dobson graduated as a civil engineer from the University of Missouri, Kansas MO, in 1909. He was first assistant city engineer at Manila, the Philippines until 1910, then a special agent of the US General Land Office, to continue until 1916 on Panama Canal with field work for the Gatun spillway and locks. The following year was spent with railroad works at Kansas City, and from 1917 to 1918 Dobson was a captain of the US Corps of Engineers in France. Upon return to the USA he was a professor of military sciences and tactics at Colorado School of Mines until 1920, when joining a firm on special hazard insurance reports until 1925. After having been a consultant in Tulsa OK, Dobson joined from 1929 to 1935 the staff of the US Engineering Office, Memphis TN, dealing with flood control studies of Arkansas River and its tributaries. Finally, Dobson was employed with research work in the Soil Conservation Service SCS, Washington DC, thereby advancing to Chief of the Sedimentation Division until retirement in 1943. During his last years he was a private consultant at Tulsa OK. During his stay with SCS from 1935 to 1943, Dobson served both as field engineer and specialist in mathematical investigations. His most valuable technical contribution was a review of the mathematical processes employed by Paul Du Boys (1847-1924) in his Study of the regime of the Rhone River and the action exercised by the water on an indefinitely shifting bed of gravel, published in 1879. His first position in SCS was as hydraulic engineer, supervising investigations of bed-load movements in natural streams. In 1936 he became Head of the Sedimentation Section, in charge of mainly reservoir sedimentation studies with related laboratory work. He prepared reports and papers with the US Department of Agriculture, most notably the 1940 bulletin. Anonymous (1939). Dobson, G.C. 1st Hydraulics Conference Iowa: Frontispiece. P Anonymous (1941). Dobson, Gilbert C. Who’s who in engineering 5: 467. Lewis: New York. Anonymous (1947). Gilbert Colfax Dobson. Trans. ASCE 112: 1434-1437. Dobson, G.C. (1938). Discussion of Turbid water through Lake Mead. Trans. ASCE 103: 759-763. Dobson, G.C., Johnson, J.W. (1940). Studying sediment loads in natural streams. Civil Engineering 10(2): 93-96. Dobson, G.C. (1943). Discussion of Suspended-matter concentration. Trans. ASCE 108: 958-959. Happ, S.C., Rittenhouse, G., Dobson, G.C. (1940). Some principles of accelerated stream and valley sedimentation. Bulletin 695. US Department of Agriculture: Washington DC.