Construction of the intake weir should be carried out during a period of low to moderate flow
between 1st June and 30th September and will require the temporary diversion of water. This
will involve the construction of a temporary cofferdam across one half of the riverbed using
sand bags or material available on site. Part of the weir is built downstream of the
cofferdam. The temporary cofferdam is then moved over to the other half of the river. The
river then passes through the scour valve that is capable of passing a flow equivalent to Q20
and cast into the first half of the weir while the remaining part of the weir is built. This work
may last for about three to four weeks.
The weir at the Intake will be approximately 12m long. Concrete will be placed by direct
placement, the first pour being for the base slab. The weir wall and the intake part of the
structure will then be placed in two lifts to simplify the shuttering requirements.