Paragraph 63 Runoff

(1)

Authorised works must be constructed and operated so as not to result in—

(a)

an increase in the rate or volume of surface water discharged from the Order land, or

(b)

an increase or decrease in the rate and volume of surface water discharged into Elstow Brook or Harrowden Brook,

during any given rainfall event for each zone and return period in the drainage strategy.

(2)

The site controller must—

(a)

provide to the Secretary of State details of a methodology—

(i)

prepared having regard to the Flood Estimation Handbook^f1, and

(ii)

capable of accurately monitoring compliance with sub-paragraph (1),

(b)

use that methodology to monitor compliance with sub-paragraph (1), and

(c)

provide to the Secretary of State, on request, reports of the results of monitoring carried out in accordance with that methodology.

(3)

For the purposes of this paragraph, “rainfall event” means a rainfall event of any intensity that may reasonably be expected to affect the Order land, up to and including the intensity of the design flood event applicable to surface water flooding.

Annotations

Footnotes

f1: Flood Estimation Handbook (ISBN 978 1 906698 00 3), published by the Centre for Ecology and Hydrology, 2008, available at https://www.ceh.ac.uk/data/software-models/flood-estimation-handbook#software.