Paragraph 13 Survey of river bedI1

before the commencement of construction or carrying out of the first tidal work to be commenced following approval under paragraph 5, a survey of such parts of the river as might be affected by sedimentation or scouring that might result from the construction of so much of the authorised project as would comprise tidal works if they were to be constructed, such survey being for the purpose of establishing the condition of the river at the time the survey is carried out;

before the commencement of construction or carrying out of any tidal work approved under paragraph 5, a survey of such parts of the river as might be affected by sedimentation or scouring resulting from that tidal work, such survey being for the purpose of establishing the condition of the river at the time the survey is carried out;

during the construction or carrying out of any tidal work, such surveys of the river (for the purpose of ascertaining the effect of that tidal work on the river) as are stipulated in the scour and accretion monitoring and mitigation strategy or the relevant scour and accretion monitoring and mitigation plan; and

after completion of, respectively, any tidal work and all the tidal works constructed or carried out under this Order, a survey of the completed tidal works as constructed or carried out (for the purpose of establishing the condition of the river and the effect that the tidal work or the authorised project is, or as the case may be the tidal works are, having on sedimentation or scouring, the flow and regime of the river, the navigation of the river or the protection of structures within the river or the exercise of the Authority’s functions) as are stipulated in the scour and accretion monitoring and mitigation strategy or the relevant scour and accretion monitoring and mitigation plan.