Combined Sewer Overflow Data from Alewife Brook and the Mystic River on the EEA CSO data portal
Andy Hrycyna
10-22-2023
The following data is downloaded from the MA EEA Data Portal for CSOs. Data in the portal extends backwards to mid-2022. Updated October 22, 2023. The portal has data on release volumes from specific CSO outfalls by date, along with precipitation and duration information. Precipitation data is acquired from USGS gage at Fresh Pond, near Alewife Brook.
Totals for Mystic River and Alewife Brook CSOs
| OutfallId | WaterBody | 2023 | 2022 |
|---|---|---|---|
| BOS017 | MYSTIC RIVER | 525,000 | NA |
| BOS019 | LITTLE MYSTIC CHANNEL | 716,000 | 71,500 |
| CAM001 | ALEWIFE BROOK | 0 | NA |
| CAM401A | ALEWIFE BROOK | 10,742,000 | 450,000 |
| CAM401B | ALEWIFE BROOK | 420,000 | NA |
| CHE003 | MYSTIC RIVER | 28,000 | NA |
| CHE004 | MYSTIC RIVER | 58,984 | NA |
| MWR205 | MYSTIC RIVER | 106,160,000 | 15,080,000 |
| SOM001A | ALEWIFE BROOK | 6,696,000 | 32,000 |
| SOM007A/MWR205A | MYSTIC RIVER | 34,340,000 | 2,720,000 |
CAM401 is responsible for the majority of releases in Alewife Brook.
2023 Summer Alewife CSOs by Outfall and Date
CAM401A consistently has greater volumes than SOM001A. (I am trying to track down information on the one exception to this pattern, in August.)
Precipitation and CSO volumes
Precipitation rate (right hand column) is a better predictor of CSO volumes than total daily precipitation (left).
