Hydraulic Radius Calculation

Published: November 30, 2018 | Last updated: July 5, 2023

What Does Hydraulic Radius Calculation Mean?

Hydraulic radius calculation is made using Manning equation to determine the hydraulic capacity and flow velocity of pipes. Sliplining, pipe bursting and cured-in-place pipe (CIPP) are some of the methods that are used for trenchless rehabilitation of pipes that have lost their hydraulic and flow capacity.

Pipes used for trenchless rehabilitation are made with materials such as high density polyethylene (HDPE), polyvinyl chloride (PVC) and glass reinforced plastic (GRP) that have hydraulic characteristics that greatly increase the service life of a pipe.

Trenchlesspedia Explains Hydraulic Radius Calculation

Many sewers pipes are past their service life but are still in use. Analysis of sewer networks using archived project data, condition assessment and video inspection should be carried out to determine which pipes need replacement and which pipes can be rehabilitated. Hydraulic calculations can also be carried out to ensure that the replaced pipeline is able to bear an estimated increase in flow from population increase.

The pipes are designed and installed such that they have a minimum flow velocity or self-cleansing velocity or a maximum flow velocity or non-scouring velocity.

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