As you will see from the chart below, based on historical increases, the facility was projected to have 29 years’ worth of growth capacity as late as 2017. In 2018, the actual flow to Rocky River Regional increased by the same amount as it had the previous 10 years combined. As soon as this data was available, the staff and board of the Water and Sewer Authority began planning for an expansion of Rocky River Regional.
Here is the data that the Water and Sewer Authority was looking at.
Note that from 2013 to 2017, the actual and allocated daily flow grew by less than 500 thousand gallons per year, and at that growth rate, the Rocky River facility had adequate capacity to handle growth for decades.
Two years of historically high rainfall in 2018 and 2020 tilted the long-term trend line steeper. After the rapid increase in 2018, the Water and Sewer Authority began planning for expanding its treatment capacity.