4.3.3 Air and Water Filled Tubes
These flood protection products are typically pre-fabricated geomembrane tubes, filled with
air or water to form a dam. They utilise air or water which is always in abundance during
flood events. The tubes are normally portable and require pumps for inflation. Some are
stackable. This should be done with caution, as the tubes would not necessarily adhere to each
other as well as they do to the bedding surface. These tubes have significant width to height
ratios when fully deployed (a two metre high tube could occupy a width of about seven
metres). They are very quick to deploy and only require manual installation and one or twomobile pumps. The larger tubes may however require up to four or more operatives for
deployment. The water filled tubes are gravity dams, using the weight of water to provide
stability. To prevent rolling, most systems have some form of anchoring. Internal anchoring
methods include use of internal baffles, internal tubes and multiple tubes secured to form a
stable shape. External anchoring methods include anchor pins and the use of long skirts on
which vertical water pressure acts. Air filled tubes tend to have external anchoring due to their
light weight. Air and water filled tubes are generally suitable for long lengths of protection
close to a water source. They are not ideal for filling small gaps. They are susceptible to tears
and punctures, which are usually repairable during service if on external tube.
Advantages:
! Low bearing pressure on the bedding surface
! Very versatile, can be used for a lot of other emergency or operational scenarios
! Quick and easy to install
! Small storage space required
! Installation only requires operatives and mobile pumps
! Tears can usually be repaired in service
! Flexible enough to accommodate minor uneven terrain
! Easily cleaned and re-usable.
Disadvantages:
! High width to height ratio restrictive for larger tubes
! Major tear affecting internal tubes or air filled tubes could lead to whole system failure
! Require relatively flat surfaces
! Risk of freezing of water in tubes at low temperatures leading to failure.
4.3.3 Air and Water Filled Tubes
These flood protection products are typically pre-fabricated geomembrane tubes, filled with
air or water to form a dam. They utilise air or water which is always in abundance during
flood events. The tubes are normally portable and require pumps for inflation. Some are
stackable. This should be done with caution, as the tubes would not necessarily adhere to each
other as well as they do to the bedding surface. These tubes have significant width to height
ratios when fully deployed (a two metre high tube could occupy a width of about seven
metres). They are very quick to deploy and only require manual installation and one or twomobile pumps. The larger tubes may however require up to four or more operatives for
deployment. The water filled tubes are gravity dams, using the weight of water to provide
stability. To prevent rolling, most systems have some form of anchoring. Internal anchoring
methods include use of internal baffles, internal tubes and multiple tubes secured to form a
stable shape. External anchoring methods include anchor pins and the use of long skirts on
which vertical water pressure acts. Air filled tubes tend to have external anchoring due to their
light weight. Air and water filled tubes are generally suitable for long lengths of protection
close to a water source. They are not ideal for filling small gaps. They are susceptible to tears
and punctures, which are usually repairable during service if on external tube.
Advantages:
! Low bearing pressure on the bedding surface
! Very versatile, can be used for a lot of other emergency or operational scenarios
! Quick and easy to install
! Small storage space required
! Installation only requires operatives and mobile pumps
! Tears can usually be repaired in service
! Flexible enough to accommodate minor uneven terrain
! Easily cleaned and re-usable.
Disadvantages:
! High width to height ratio restrictive for larger tubes
! Major tear affecting internal tubes or air filled tubes could lead to whole system failure
! Require relatively flat surfaces
! Risk of freezing of water in tubes at low temperatures leading to failure.
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