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During wet weather, stormwater and groundwater inflow and infiltration into the sanitary sewer collection system causes high wastewater flows to the treatment plant.
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During these conditions, CMSA blends chemically enhanced primary-treated effluent from the primary clarifiers with fully-treated effluent from the secondary clarifiers prior to chlorination, dechlorination, and discharge into the Central San Francisco Bay.
Below are the blend events for the current wet weather season. The Agency maintains records of blend events from prior wet weather seasons.
Blending Events
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| Start |
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End |
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Duration
(Days) |
|
Volume
(Million Gal.) |
|
Rainfall
(in) |
| | May 18, 2019 - 20:55 | | May 19, 2019 - 12:50 | | 0.66 | | 2.09 | | 0.22 |
| | Mar 23, 2019 - 01:50 | | Mar 23, 2019 - 04:20 | | 0.10 | | 0.22 | | 0.01 |
| | Mar 6, 2019 - 04:50 | | Mar 6, 2019 - 23:40 | | 0.78 | | 8.19 | | 0.09 |
| | Mar 2, 2019 - 07:35 | | Mar 2, 2019 - 21:55 | | 0.60 | | 5.3 | | 0.02 |
| | Feb 25, 2019 - 19:05 | | Feb 28, 2019 - 13:25 | | 2.76 | | 80.69 | | 4.65 |
| | Feb 16, 2019 - 09:50 | | Feb 16, 2019 - 14:50 | | 0.21 | | 0.56 | | 0.06 |
| | Feb 13, 2019 - 05:05 | | Feb 15, 2019 - 22:45 | | 2.74 | | 95.6 | | 4.25 |
| | Feb 4, 2019 - 00:50 | | Feb 5, 2019 - 02:00 | | 1.05 | | 12.1 | | 7.81 |
| | Feb 3, 2019 - 10:05 | | Feb 3, 2019 - 15:40 | | 0.23 | | 0.4 | | 0.03 |
| | Feb 2, 2019 - 10:35 | | Feb 2, 2019 - 13:20 | | 0.11 | | 0.26 | | 0.01 |
| | Jan 15, 2019 - 17:55 | | Jan 18, 2019 - 09:40 | | 2.66 | | 26.88 | | 2.73 |
| | Jan 6, 2019 - 12:45 | | Jan 7, 2019 - 15:55 | | 1.13 | | 22.27 | | 0.72 |
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