Resource agencies in the Pacific NW discourage full span structures for grade control. The problem has been that over time the downstream reach erodes/downcuts leaving a jump height over the full spaning log weir that exceeds fish passage requirements. Agencies prefer a roughened channel reach...
Does anyone test cast-in-place concrete stormwater retention/detention vaults for leakage?
Per our state department of transportation standard specifications, catch basins are to be "water tight". Placement of concrete for structures (e.g. large underground stormwater vault)"...shall leave a...
