5 Towards Developing Guidelines
47
Fig. 5.4 Navigation lock on the Tees Barrage, UK. (Courtesy of HR Wallingford)
rage may allow shallower draught vessels to pass over it at high water. All three types of
barrage will modify navigation to different degrees depending on the specification,
situation and barrage design. If commercial navigation is an important issue it will
probably be necessary to provide reasonable unrestricted access during all phases of
construction as well as in the final scheme (see Fig. 5.4).
5.4.9
Structural Engineering Concepts
In many ways the purpose of the engineering works is to put into practice the requirements made by the environmental policy makers. These include providing:
• An adequate flood discharge system, spillways, training walls, gates and valves and
stilling basins
• Locks or alternative navigation routes through the barrage
• Lead-in jetties and dolphins including lead-in structures and dolphins to ensure
smooth travel through the barrage and that the fabric of the barrage is protected
from vessel impact
• Fish passes to ensure that the passage of migratory fish is not hindered by the barrage
• Beds and bank protection to protect the surrounding areas from a changed regime
• Land reclamation for economic development
• Embankments and walls that actually form the barrage
• Closure of the waterway during barrage construction
47
Fig. 5.4 Navigation lock on the Tees Barrage, UK. (Courtesy of HR Wallingford)
rage may allow shallower draught vessels to pass over it at high water. All three types of
barrage will modify navigation to different degrees depending on the specification,
situation and barrage design. If commercial navigation is an important issue it will
probably be necessary to provide reasonable unrestricted access during all phases of
construction as well as in the final scheme (see Fig. 5.4).
5.4.9
Structural Engineering Concepts
In many ways the purpose of the engineering works is to put into practice the requirements made by the environmental policy makers. These include providing:
• An adequate flood discharge system, spillways, training walls, gates and valves and
stilling basins
• Locks or alternative navigation routes through the barrage
• Lead-in jetties and dolphins including lead-in structures and dolphins to ensure
smooth travel through the barrage and that the fabric of the barrage is protected
from vessel impact
• Fish passes to ensure that the passage of migratory fish is not hindered by the barrage
• Beds and bank protection to protect the surrounding areas from a changed regime
• Land reclamation for economic development
• Embankments and walls that actually form the barrage
• Closure of the waterway during barrage construction