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To ensure a smooth gravity flow, the sewer should be carried out in proper alignment and position. Proper alignment and gradient are done by boning rods and sight rails and with help of dumpy levels. On sight rails modified levels inverts are marked. It may be marked by fixing nails or modifying theRead more
To ensure a smooth gravity flow, the sewer should be carried out in proper alignment and position. Proper alignment and gradient are done by boning rods and sight rails and with help of dumpy levels. On sight rails modified levels inverts are marked. It may be marked by fixing nails or modifying the top of sight rails on the sewer line to modified levels of invert. And boning rods or travelers are used to check the invert level of a sewer line. A Boning rod is a vertical wooden post fitted with an iron shoe at the bottom and a cross-head at the top.
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