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For calculating the index, a calculation algorithm was implemented which, on
the basis of the principle of hydraulic risk management to be applied in the building
lot, defines the maximum value allowed for the outflow extent due to the SDP
(Qsdp,max). If the outflow extent generated by the input action typologies for characterising the SDP (Qsdp) exceeds this value, the index requires a check of this
extent and imposes the Qsdp = Qsdp,max equation, envisaging the presence of a
lamination tank in the line where exceeding extents flow, then it calculates the volume of the reservoir. The tank is calculated on the basis of a return time of 50 or 100
years (depending on what is envisaged by the RUE).
If the user has chosen to prepare a rainwater collection tank, and the index has
calculated that it is necessary to also envisage a lamination tank, then the square
metres of the rainwater tank are deducted from those of the tank.
5.1 Index Output
In the calculation of the index, the extent (l/s) in the Actual State and in the Planned
State is defined. The ratio between these values and the Land Area (SF) is the index
reference parameter (l/s per m 2 of SF).
Since the hydraulic risk management principles “calibrate” the plan extent
(Qsdp) on the basis of the extent in the actual state and the maximum plan extent
acceptable (Qsdp,max), the classes defined for assessing the output have been associated to the Qsdp,max values required by the various principles. In this case, unlike
what was done for the “RATE” index, the output produced by the Planned State was
not compared with that of the Actual State, but with the maximum one in the Planned
State (determined by the principle applied).
The output value is the measure of specific “performances” of the building lot
and can be highlighted depending on various features.
• the planned scenario (SDP) class identifies the quality of the action with reference to what is already required by the principle applied (SDPmax);
• by processing different classes of energy performance output values are associated with, the number of reduced classes between the planned scenario (SDP)
and the maximum planned scenario (SDPmax) highlights the improvements
achieved;
• the total reduction of extent (l/s) in the planned scenario (SDP), in comparison
with the maximum planned scenario (SDPmax) highlights the extent of the
improvements with reference to the building lot size.
6 UHI in the Metropolitan Cluster of Bologna-Modena...
For calculating the index, a calculation algorithm was implemented which, on
the basis of the principle of hydraulic risk management to be applied in the building
lot, defines the maximum value allowed for the outflow extent due to the SDP
(Qsdp,max). If the outflow extent generated by the input action typologies for characterising the SDP (Qsdp) exceeds this value, the index requires a check of this
extent and imposes the Qsdp = Qsdp,max equation, envisaging the presence of a
lamination tank in the line where exceeding extents flow, then it calculates the volume of the reservoir. The tank is calculated on the basis of a return time of 50 or 100
years (depending on what is envisaged by the RUE).
If the user has chosen to prepare a rainwater collection tank, and the index has
calculated that it is necessary to also envisage a lamination tank, then the square
metres of the rainwater tank are deducted from those of the tank.
5.1 Index Output
In the calculation of the index, the extent (l/s) in the Actual State and in the Planned
State is defined. The ratio between these values and the Land Area (SF) is the index
reference parameter (l/s per m 2 of SF).
Since the hydraulic risk management principles “calibrate” the plan extent
(Qsdp) on the basis of the extent in the actual state and the maximum plan extent
acceptable (Qsdp,max), the classes defined for assessing the output have been associated to the Qsdp,max values required by the various principles. In this case, unlike
what was done for the “RATE” index, the output produced by the Planned State was
not compared with that of the Actual State, but with the maximum one in the Planned
State (determined by the principle applied).
The output value is the measure of specific “performances” of the building lot
and can be highlighted depending on various features.
• the planned scenario (SDP) class identifies the quality of the action with reference to what is already required by the principle applied (SDPmax);
• by processing different classes of energy performance output values are associated with, the number of reduced classes between the planned scenario (SDP)
and the maximum planned scenario (SDPmax) highlights the improvements
achieved;
• the total reduction of extent (l/s) in the planned scenario (SDP), in comparison
with the maximum planned scenario (SDPmax) highlights the extent of the
improvements with reference to the building lot size.
6 UHI in the Metropolitan Cluster of Bologna-Modena...