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

Abstract: 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: Deposition | Hydrographic surveys | Probe instruments | Reservoirs | Sediment | Silts | Virginia |

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