Dewatering system flow
(a) Flow measurements. The flow from individual dewatering wells will be measured by means of a pitometer installed in the discharge pipe from the well. As a check on the pitometer measurements and on the performance of the well pump, the rate of flow being pumped will also be estimated from the pump
characteristic curve, engine speed, static lift of the
water, and the pressure in the discharge pipe at the top of the well. Flow from the entire dewatering system will also be measured by means of a pitometer. All flow measurements will be made by the C. O.R. assisted by the Contractor’s “dewatering” engineer.
(b) Frequency of measurement. The total flow from the dewatering system shall be measured once or twice a week and the flow from individual wells weekly or biweekly, as appears appropriate.
(c) Records. All flow measurements will be recorded by the C. O.R. and a copy of the data furnished to the Contractor within 24 hours. The C. O.R. will be
responsible for reading the river gage and recording
the data; a copy of the river gage reading will be furnished to the Contractor each day.
(3) Sanding. The flow from each dewatering well will be monitored for sanding. The rate of sanding will be determined by taking a measured amount of water being pumped from each well and the sand content determined. The maximum rate of sanding acceptable will be 5 parts per million. The rate of sanding will be checked once a week by the C. O.R. and the data recorded. A copy of the data will be furnished to the Contractor within 24 hours.