The degradation of rhodamine-B in the simulated wastewater has been experimentally investigated on a 220 L hydrodynamic cavitation set-up with multiple hole orifice plates to verify the effect of degradation with cavitation as well as investigate the influence of geometric parameters on degradation rate constant.

In paper,writer analyses change regularities of LCB,sets up maths model of bending section ,compiles CASIO fx-4500P calculate program and discusses a new way of setting out in gradual change bending sections using electronic total station instrument on the basis of practice work in Xiaolangdi orifice tunnel project.

In order to demonstrate the reliability of the water filling and pressure balance pipeline of flood-releasing tunnel in Xiaolangdi Multi-purpose Project,a prototype observation about the vibration characteristics of the pipeline was done at the upper water level of 252.