1 Scope
2 Purpose
3 Maintenance
3.1 Control of drainage systems and their
installations
3.1.1 Outfall ditches
3.1.2 Observation of drained areas
3.1.3 Structures
3.1.4 Structural alterations
3.2 Maintenance
3.2.1 Outfall ditches
3.2.2 Structures
3.3 Rectification of flow interruptions in pipe
drainage
3.3.1 Causes of flow interruptions
3.3.2 Identification of flow interruptions
3.3.3 Rectification of local flow
interruptions
3.3.4 Rectification of flow interruptions
over a wide area