Welland Water Treatment Plant - 2018 Summary Report

Prepared under Ontario Regulation 170/03

The Welland Water Treatment Plant was operated in such a way that it met or exceeded the requirements of the Act, the regulation, the system’s approval or any order that may have been issued for this reporting period with the following exception:

During the inspection of the Welland Water Treatment Plant, an inappropriate approval method for construction was used. Niagara Region was found to be in non-compliance with item (b) of Subsection 31 (1) of the Safe Drinking Water Act, 2002, which requires an application for a Schedule C amendment prior to constructing linear work which crosses a waterbody using an open-cut construction method.

Internal operating procedures were updated and staff training was conducted to ensure appropriate approvals are obtained prior to construction.

Summary of Flows

Date Total Flow Raw (ML) Total Flow Treated (ML) Average Day Raw (ML) Average Day Treated (ML) Maximum Day Treated (ML) Minimum Day Treated (ML) Maximum Flow Rate Treated (ML/d) Minimum Flow Rate Treated (ML/d) Waste Sludge (ML)
Jan 680.560 672.057 21.954 21.679 27.748 13.615 39.888 22.351 21.345
Feb 602.360 592.912 21.513 21.175 27.500 13.820 40.231 21.922 18.804
Mar 658.630 633.278 21.246 20.428 27.525 11.700 39.138 24.423 36.653
Apr 629.840 615.674 20.995 20.522 23.059 17.271 40.856 23.979 27.165
May 710.340 699.436 22.914 22.562 30.190 19.706 48.668 18.194 24.268
Jun 769.740 750.298 25.658 25.010 30.629 20.419 40.494 25.038 37.607
Jul 908.740 891.671 29.314 28.764 35.789 22.909 51.112 10.296 37.011
Aug 791.350 777.488 25.527 25.080 35.394 20.290 40.594 24.675 31.908
Sep 701.540 687.628 23.385 22.921 28.598 20.415 39.931 16.104 29.936
Oct 661.080 654.130 21.325 21.101 24.296 18.869 39.350 19.719 27.409
Nov 624.320 615.690 20.811 20.523 22.614 18.634 42.487 14.799 24.586
Dec 659.360 641.388 21.270 20.690 22.788 18.364 41.237 11.331 31.229
Total 8397.860 8231.650             347.921
Minimum           11.700   10.296 18.804
Maximum         35.789   51.112   347.921
Average     22.993 22.538         28.993

The flow rates are moments in time, and can be affected by various circumstances, such as pump changes or valve position and therefore not unusual to have higher or lower than normal flows.

Comparison of Actual to System Approved Flow

Flow rates as set in the Municipal Drinking Water Licence # 007-104 and Drinking Water Works Permit # 007-204.

Maximum daily flow: 65.000 ML
Maximum flow rate: 65.000 ML/day
Maximum daily flow - during construction 81.800 ML
Maximum flow rate - during construction 81.800 ML/day

The percentage of rated capacity has been calculated based on the maximum daily flow during construction for January 1, 2017 – December 31, 2017

Date Average Day Treated (ML) % of Rated Capacity Maximum Day Treated (ML) % of Rated Capacity Maximum Flow Rate Treated (ML/d) % of Rated Capacity
Jan 23.882 36.7% 26.249 40.4% 40.525 62.3%
Feb 21.208 32.6% 27.834 42.8% 49.103 75.5%
Mar 20.465 31.5% 23.241 35.8% 40.131 61.7%
Apr 19.951 30.7% 21.716 33.4% 47.356 72.9%
May 20.000 30.8% 23.398 36.0% 40.544 62.4%
Jun 23.756 36.5% 30.982 47.7% 52.500 80.8%
Jul 24.090 37.1% 29.708 45.7% 40.237 61.9%
Aug 22.609 34.8% 26.384 40.6% 40.312 62.0%
Sep 22.451 34.5% 25.931 39.9% 40.450 62.2%
Oct 20.554 31.6% 22.680 34.9% 39.950 61.5%
Nov 19.746 30.4% 23.070 35.5% 40.430 62.2%
Dec 20.366 31.3% 23.476 36.1% 40.781 62.7%
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