CSO Information

About Combined Sewer Overflows (CSO):

A portion of the FRWRD service area in central Elgin is connected to a combined sewer system (CSS). A combined sewer system is where all sanitary waste and stormwater flows are combined into the same sewers for transport.

During normal flow periods, all the flows in the CSS are transported to the Albin D. Pagorski Water Reclamation Facility (ADP WRF) for treatment. Most of the CSS and combined sewer overflows (CSOs) are owned by the City of Elgin. FRWRD owns a single combined sewer overflow (CSO) discharge point in the system located on Lower Wellington Avenue just north of US 20.

During very high flows associated with storm events, the flows in the CSS can exceed the capacity of the system. In those situations, CSOs are activated and flows over the amount that can be transported for treatment are discharged directly to the Fox River.

For the CSO point owned by FRWRD, the following table provides information on discharge events that have occurred. Data will begin being populated for events starting April 1, 2016. For events prior to April 1, 2016, contact FRWRD for information.
 
CSO Outfall # = 004
Outfall Description = Lower Wellington Avenue just north of US-20

CSO Event Table for Lower Wellington Discharge Point Owned by FRWRD

Start Date Rainfall Duration (hrs.) Rainfall Amount (in.) Estimated Duration of
CSO Discharge (hrs.)
Estimated Volume of
CSO Discharge (MG)
09/11/2023 3.0 0.3 0.04 0.007
08/14/2023 2.75 0.8 0.03 0.0067
07/29/2023 0 0 0.27 0.054
07/28/2023 6.5 2.73 1.09 0.323
07/22/2023 2.75 1.04 0.28 0.056
07/05/2023 3.75 1.52 0.57 0.137
06/24/2023 2.75 1.07 0.34 0.0693
04/04/2023 1.00 0.58 0.471 0.102
03/31/2023 1.75 0.90 0.314 0.077
02/27/2023 7.00 1.42 0.313 0.066
08/28/2022 2.00 1.46 0.836 0.210
08/08/2022 4.50 1.02 0.137 0.032
07/23/2022 1.25 1.32 0.689 0.223
07/06/2022 6.00 2.45 0.661 0.139
07/05/2022 1.25 3.38 1.348 0.438
05/25/2022 2.25 1.38 0.975 0.241
04/22/2022 3.50 0.90 0.365 0.079
08/09/2021 0.75 0.78 0.273 0.062
06/26/2021 2.00 0.37 0.101 0.022
06/25/2021 6.50 1.41 0.145 0.030
06/20/2021 2.25 1.65 0.553 0.137
07/15/2020 9.50 2.02 0.065 0.011
06/29/2020 3.75 2.08 0.293 0.088
06/26/2020 0.50 0.55 0.828 0.213
05/24/2020 0 0 2.077 0.282
05/23/2020 0.75 0.74 1.291 0.230
05/19/2020 1.5 0.04 3.068 0.475
05/18/2020 0 0 17.894 2.572
05/17/2020 20.50 2.36 9.118 1.784
05/15/2020 3.00 1.58 2.603 0.684
05/14/2020 4.00 1.86 0.751 0.125
03/28/2020 1.75 0.86 0.035 0.004
10/11/2019 2.25 0.35 1.009 0.394
10/05/2019 2.00 0.29 0.019 0.008
10/02/2019 3.75 1.17 1.494 0.583
09/29/2019 1.75 0.43 0.225 0.088
09/27/2019 2.00 0.41 0.204 0.080
09/22/2019 1.75 0.58 0.398 0.155
09/13/2019 5.25 3.41 2.428 0.947
08/26/2019 1.75 1.06 0.236 0.092
07/29/2019 3.50 1.05 0.107 0.042
07/18/2019 4.25 1.32 0.332 0.129
06/28/2019 0.50 0.68 0.029 0.011
06/24/2019 0.75 0.43 0.074 0.029
06/04/2019 3.50 0.52 0.128 0.050
05/28/2019 4.50 0.54 0.175 0.068
05/27/2019 1.25 0.15 0.156 0.061
05/22/2019 4.25 0.58 0.186 0.072
05/09/2019 4.25 0.79 2.185 0.852
05/08/2019 4.25 1.36 0.549 0.214
05/02/2019 8.25 0.86 2.584 1.008
05/01/2019 5.25 0.28 0.139 0.054
04/30/2019 12.50 0.75 1.002 0.391
04/29/2019 5.75 1.11 0.911 0.355
04/11/2019 2.00 0.56 0.613 0.239
03/14/2019 0.50 0.29 0.224 0.087
03/09/2019 4.25 0.52 0.652 0.254
02/23/2019 15.00 0.75 1.186 0.462
02/07/2019 2.75 0.41 0.137 0.053
02/05/2019 1.10 0.80 0.617 0.241
12/01/2018 22.75 2.10 0.949 0.370
10/10/2018 1.50 0.33 0.234 0.093
10/09/2018 0.00 0.00 0.068 0.027
10/08/2018 0.00 0.00 1.024 0.399
10/07/2018 2.00 0.40 0.862 0.336
10/05/2018 5.00 0.70 0.329 0.128
10/01/2018 3.00 1.82 1.463 0.571
09/03/2018 15.75 1.57 0.706 0.275
09/02/2018 2.25 0.24 0.331 0.129
08/29/2018 5.00 1.90 0.723 0.282
08/28/2018 0.25 0.61 0.071 0.028
08/25/2018 2.25 0.46 0.094 0.037
08/17/2018 2.00 0.45 0.236 0.092
08/7/2018 1.75 1.43 0.905 0.353
07/29/2018 1.50 1.08 0.351 0.137
07/21/2018 2.50 0.68 0.167 0.065
06/27/2018 5.75 1.86 6.469 2.523
06/26/2018 2.00 0.70 1.167 0.455
06/22/2018 3.50 0.65 0.502 0.196
06/21/2018 5.75 1.00 0.937 0.365
06/16/2018 1.25 0.58 0.803 0.313
06/10/2018 4.50 0.57 0.141 0.055
06/09/2018 6.25 1.08 0.281 0.110
05/30/2018 3.50 2.70 1.910 0.745
05/21/2018 7.50 1.08 0.669 0.261
05/20/2018 2.50 0.45 0.084 0.033
05/14/2018 16.75 1.38 0.708 0.276
05/13/2018 3.25 0.65 0.109 0.043
05/02/2018 12.75 2.30 2.866 1.118
04/15/2018 15.25 0.69 0.074 0.029
03/01/2018 4.00 0.50 0.323 0.126
02/20/2018 8.50 1.00 0.824 0.322
01/22/2018 3.25 0.66 0.336 0.131
10/14/2017 21.25 3.19 1.334 0.520
10/11/2017 5.25 1.00 0.354 0.138
08/16/2017 6.00 1.04 0.425 0.166
07/23/2017 1.00 0.94 1.480 0.577
07/22/2017 6.25 0.44 0.865 0.337
07/21/2017 7.25 1.86 2.731 1.065
07/20/2017 2.75 1.13 3.199 1.248
07/19/2017 2.50 0.22 0.021 0.008
07/12/2017 15.5 1.67 0.093 0.036
07/11/2017 2.25 2.48 1.529 0.596
07/10/2017 2.50 0.59 0.394 0.154
06/28/2017 2.50 1.66 1.366 0.533
06/23/2017 2.00 0.95 0.456 0.178
06/17/2017 1.25 0.28 0.053 0.021
06/14/2017 2.50 0.99 0.333 0.130
05/23/2017 1.75 0.34 0.532 0.207
05/20/2017 1.75 0.27 0.048 0.019
05/17/2017 0.75 0.23 0.351 0.137
05/10/2017 2.25 0.65 0.984 0.384
05/09/2017 1.50 0.33 0.125 0.049
05/06/2017 3.00 0.41 0.060 0.023
04/30/2017 4.25 0.96 1.404 0.548
04/29/2017 11.25 1.56 1.965 0.766
04/16/2017 3.00 0.50 0.124 0.048
04/10/2017 0.50 0.12 0.362 0.141
03/30/2017 13.00 1.96 1.908 0.744
01/17/2017 1.25 0.35 0.609 0.236
01/16/2017 7.00 0.74 0.775 0.302
11/28/2016 3.00 0.36 0.021 0.008
10/26/2016 14.00 1.41 0.716 0.279
10/06/2016 14.25 1.24 0.314 0.122
09/07/2016 0.50 0.71 0.078 0.030
08/20/2016 0.75 0.66 0.524 0.204
08/18/2016 0.75 0.19 0.018 0.007
07/23/2016 3.00 0.77 0.422 0.165
07/21/2016 0.75 0.82 0.332 0.130
07/06/2016 5.25 0.79 0.096 0.037
06/22/2016 1.75 0.82 0.313 0.122
06/15/2016 2.50 0.93 0.208 0.081

FRWRD has several documents available related to the CSO system. Those documents are available below:

FRWRD CSO Long Term Control Plan (LTCP)
FRWRD CSO Pollution Prevention Plan (PPP)
FRWRD CSO Public Notification Plan