51茶馆

If you plan to abstract or impound water, the Environment Agency may need you to provide flow data with your application. If you want to clarify whether data is needed and what type, you can get advice before you apply for a licence to abstract or impound water. 听

The flow data normally needed includes:听

• flow duration statistics including the mean flow value听
• details of how you have produced the flow duration statistics听
• flow measurements to validate the flow duration statistics听
• hydrographs showing the impact of your proposal听

鈥楢bstract or impound water: hydrological information needed for your licence application鈥� guidance explains what these terms mean and how you can get the information.

The Environment Agency may also need you to provide hydraulic information about the structures associated with your application.

The structure information needed may include:

• drawings of your structure including details of the dimensions 鈥� this may include a detailed survey if the structure already exists, especially if it is non-standard
• calculations using the appropriate equation to work out the river flow or abstraction rates
• a list of assumptions you have made during these calculations
• flow measurements to understand flow around and over structures at the site

After your abstraction or impoundment licence has been issued, the Environment Agency may need:

• confirmation that the structures were constructed in line with the drawings we agreed during licence determination
• flow measurement to validate the calculations provided during determination
• ongoing maintenance and calibration of structures to ensure you continue to comply with your licence conditions

鈥楢bstract or impound water: hydraulic information needed for your licence application鈥� guidance explains what these terms mean and how you can get the information.