
61Introduction to Sustainable Energy
© 2008 Taylor & Francis Group, LLC
turbine to match the power generation to the load on the grid at a constant rotational
speed. Sluice gates slide up or down to control the water ow from the reservoir into
the penstocks. The water intake to the penstocks can be from the top or the bottom of
the reservoir. A scroll wraps around the turbine imparting a circulation ow to the
water so that the ow angle into the turbine is optimal. Wicket gates are louvers that
can be opened and closed relatively quickly to provide partial ow control. The water
ows down through the turbine and into the outlet and surge basi ...