Common use of Water Level Gauges Clause in Contracts

Water Level Gauges. The Contractor shall install and maintain suitable automatic water level gauge at an approved location close to the Works. This gauge shall be placed and calibrated at least 30 days before commencement of the construction of the Works. The water level gauge should be connected to an established bench mark (30 cm x 30 cm RCC pillar with 30 cm height above ground level) to be erected in the vicinity (within 5 km of the dredging site) by the Contractor, which should be having Reduced Level (RL) with respect to Mean Sea Level (MSL) and Geo Co-ordinates. The RL should be established by transfer of level from a known GTS bench mark by proper levelling. The Chart Datum values ▇.▇.▇▇ MSL for some locations are available in the DPR. The contractor has to connect the Water level gauge with the Bench mark and establish the Chart datum value on the gauge by proper levelling. Cost of construction of Bench mark, Levelling, Erection of Automatic Water Level gauge and collection of Gauge Readings are to be borne by the Contractor. During Echo sounding, water levels shall be recorded continuously.