Recording River and Reservoir Water Depth

by Mont Gilmore, Dir.; Corporate Surveys, Moore Gardner & Assocs., Asheboro, N.C.,

Serial Information: Civil Engineering—ASCE, 1977, Vol. 47, Issue 4, Pg. 64-66

Document Type: Feature article


At the Kerr Reservoir on the Roanoke River in Virginia and North Carolina, reservoir bottom was surveyed before reservoir filling and twice thereafter, to determine rate of siltation. The post-filling surveys, in 1959-60 and in 1976, offer an interesting illustration of the progress being made in hydrographic surveying. In both cases, sound-type (sonar) water depth sensors were used. But improvements were made in the latest resurvey: a narrower-beam signal gave accurate measurements at greater depth of water. Hardware for simultaneously printing location and water depth eliminated inaccuracies in the 1959 resurvey, when a cable was used for location. Computer programs enabled automatically calculating increase in siltation.

Subject Headings: Cables | Hydrographic surveys | Rivers and streams | Reservoirs | Water management | Silt | Soil surveys | River and stream beds | Virginia | United States | North Carolina

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