...
Sedimentation Improvements
Tank Inlet
The early designs have water entering the sedimentation tank through a series of pipes connecting from the bottom of the inlet channel down to the bottom of the sedimentation tank. The pipes were designed to be of different lengths to allow for water to be even distributed evenly down the lenght of the tank. This was necessary to ensure an even upflow velocity.
Beginning with the Cuatro Comunidadies design water was even distributed to the bottom of the tank through two triangular manifolds extending the length of the tank. These manifolds are connected to the inlet channel by concrete chimneys with ports exiting into the manifolds.
Lamella
Lamella are set to be angled at 60 degrees. This angle was found to optimal for floc fall out. In older designs lamella were set to be about 5cm apart, but lab experimentation has shown that a minimum spacing of 2cm is still acceptable. Designs are now based on the this closer spacing.
Drain
Entrance Tank Improvements
...