Environmental Engineering Reference
In-Depth Information
Figure 6.1
Sample screen layout of NodeXL
6.3
GEOMETRIC PROPERTIES AS INDICATORS OF NETWORK RELIABILITY
Hydraulic performance of water distribution networks results from combination of factors
emerging from their geometric properties on one side, and supplying heads and distribution
of demands, on the other side. The required level of service defined by the minimum pressure
that can guarantee 100 % of the design demand determines the room for loss of energy
inflicted by the network resistance. This resistance will mostly be controlled by appropriate
selection of pipe diameters; the lengths and routes of pipes will in reality be predefined by the
greed of streets and roads. Nevertheless, the connectivity of network nodes will play a role,
especially in irregular supply scenarios. More pipes connected to the discharge points will
cause the reduction of flow rates increasing in that way the buffer in the system.
6.3.1 Network Configuration Assessment
Water distribution network is configured by selected number of nodes and links. In branched
configurations, the number of branches is equal to the number of nodes in which three or
more links are connected. In case of loops made of
n
nodes and
m
links, the total number of
loops
l
will be calculated as:
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