Common use of Accuracy of surveys Clause in Contracts

Accuracy of surveys. The accuracy of surveys in the horizontal plane, related to the relevant benchmarks for the project should be within 1.0 m. The accuracy of surveys in the vertical plane includes: - The echo sounder which should maintain a repeatable accuracy of better than 10 cm for measurements of distances between riverbed and survey vessel waterline. - The registration of water levels by means of automatic water level gauges which should be within 5 cm. wherever erection of automatic water level gauge is not found feasible, manual water level gauge shall be erected with prior approval of Engineer’s representative. The water level plane between the tide gauges and the survey location can be assumed horizontal. Survey lines on consecutive surveys should be sailed in the same direction.

Accuracy of surveys. The accuracy of surveys in the horizontal plane, related to the relevant benchmarks for the project should be within 1.0 m. The accuracy of surveys in the vertical plane includes: - The echo sounder which should maintain a repeatable accuracy of better than 10 cm for measurements of distances between riverbed and survey vessel waterline. - The registration of water levels by means of automatic water level gauges which should be within 5 cm. wherever erection of automatic water level gauge is not found feasible, manual water level gauge shall be erected with prior approval of Engineer’s Engineer‟s representative. The water level plane between the tide gauges and the survey location can be assumed horizontal. Survey lines on consecutive surveys should be sailed in the same direction.