The improvement in resilience of water supply
systems by increasing their redundancy, either in energy
or in connectivity, is a common priority when doing rehabilitation and expansion. This however can come at the
cost of other aspects of network performance, such as
leakage management. In this work, we consider the designfor-control problem of adding new connections (from a predefined set of candidate pipes) to water supply systems to
improve their resilience to failure events while minimizing
the impact on leakage management under normal operating
conditions. We present a mixed-integer non-linear programming formulation of the problem of optimal link addition
for the minimization of average zone pressure, a surrogate
measure of pressure dependent leakage. We implement a
method based on spatial branch-and-bound to solve the
problem on a case study network from the literature and
an operational network part of an urban water system in
the UK. Finally, we validate the improvement in network
resilience resulting from the addition of new connections
by performing an a posteriori critical link analysis, using
the hydraulic resilience measure of reserve capacity.