The developed method is applied to a relatively small-scale watershed
system where flood water needs to be diverted from a river
channel to multiple-diversion regions in a flooding season (Fig. 4).
This is a case with representative data within a relatively smallscale
watershed of the middle reaches of Yangtze River, China context.
Since it is linked to some sensitive issues critically related to
community safety that are considered confidential to the general
public, we made some simplifications and hide the name of the
site. The flood problem is often faced in China during the summer
season. These three diversion regions locate at the downstream.
The regions 1 and 3 located in one side of the river; the region 2
located in the other side (Fig. 4). The region 3 is located near a
municipality. Due to the important industry, infrastructure and
intensive human activities within this region, the region 3 cannot
have an expansion. The depths of the flood diversion regions are
different for different kinds of diversion regions; for example, for
a lake, the depth of the diversion region can be as high as 50 m,
but for a plain place of the diversion region, the depth of the diversion
region can only be as low as 2 m. In this manuscript, the regions
1 and 2 are plain place. During flood time, they are used as
flood diversion regions; during other time, they are used for agriculture
uses (such as, economic crops). The depths of these two regions
are around 4–5 m. The area for regions 1 and 2 are
[3450,4057.5] mu and [4800,6000] mu, respectively. The region 3