A large majority of clearwells must be modified while maintaining the original baffles,
since they were built underground with materials like concrete. Therefore, it is
unreasonable to apply the previous research in clearwell modification which assumed
that distance between baffles is constant. In this study, the internal short-circuiting
estimation method (ISEM), which has the advantage of being applicable under any
conditions, is applied to evaluate modification of an A clearwell and to modify B and C
clearwells which have unusual characteristics. After analyzing the hydraulic efficiency
of the original state, modifications, where baffles, intra-basins and diffuser walls are
additionally installed, are considered and evaluated using the ISEM. The effect of intra-basin
and diffuser walls on T<sub>10</sub>/T is estimated and the application feasibility of ISEM is
evaluated. The improvement provided by intra-basins is almost the same as that of
baffles. Also, short-circuiting in the effluent zone can be reduced with the same level of
channel zone if an intra-basin is added in the effluent zone. However, the effect range is
restricted to the next channel zone. A diffuser wall can obtain a lower ISI than is
possible in cases where baffles and intra-basins are installed. Therefore, additional
improvement of the T<sub>10</sub>/T value can be expected after the T<sub>10</sub>/T value converges
maximum using only baffles Includes 13 references, tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.5 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 45 |
| Published : | 11/01/2008 |
