Sewer network stability and reliability factor

AMP6 Performance commitments

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Source - Page 214 Annual Performance Report 2018/19	Measure	Assessment	Reference marker (i.e. expected number of instances)	Upper Reference threshold (if 'Reported value' is above this number it is assessed as Deteriorating)	Reported value	Trend observation
Table 3B / Row 15 - Sewer Collapses	Sewer collapses	Stable	255	369	255	The total number of sewer collapses on the legacy network assets has increased 14% from 218 in 17/18 to 355 in 18/19. However, it is in line with performance in this AMP with the average performance for the 4 years being 242
Table 3B / Row 16 - Pollution incidents (CSO, RM, FS and SPS)	Pollution Incidents	Stable	203	251	172	There has remained static from 17/18 at 172 Performance is in line with performance in previous years of AMP6.
Table 3B / Row 17 - Properties flooded due to other causes	Flooding due to other causes	Deteriorating	302	379	393	There has been an increase in the number of properties flooded from 387 to 393, an increase of 1.4%.This is the second year above the Upper Limit of 379. The rate of increase is significantly less than in previous years.
Table 3B / Row 18 - Properties flooded due to overloaded sewers, excluding severe weather	Internal Flooding Net of Severe Weather	Stable	72	110	8	The number of properties flooded has reduced from 12 to 8. 18/19 has seen the trend of reduction in AMP6 continue. This is well below the reference level for overloaded sewer Stability and Reliability sub-measure reference of 72

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