Hello - this may be very trivial but I have a project in construction where we need to raise the outflow pipe going into an existing 36" precast catch basin (re-routing site storm around a new structure and in order to make up the delta in slope within the system, we are reducing the "drop" within this particular existing catch basin. In order to avoid 2" of standing storm water at the bottom, I was thinking the contractors could grout the bottom up to the invert of the new outflow pipe. Will this work for this application? Is there an industry standard? This is privately-maintained storm drain on a college campus. The District has bare bones construction standards/specifications.
Any help would be appreciated! Thanks!
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