Library of documents for Hafren Dyfrdwy
A library of our most recent documents as well as the historic Dee Valley Water documents. As Hafren Dyfrdwy was formed in the middle of the five year period, you will find documents here for Dee Valley Water, Severn Trent and Hafren Dyfrdwy.
Event Duration Monitor (EDM) Data 2020
You can find our Event Duration Monitor (EDM) report for 2020 here. This covers the monitors at 47 storm overflow locations.
Each line covers a single storm overflow showing spill frequency, duration of spill and percentage of reporting period the EDM was operational.
Comments have been added to highlight key information regarding the data supplied.
As this is the first year reporting, the period of reporting starts from the 1st April 2020 to align with the updated Natural Resources Wales permits.