Inland Water Rescue and Emergencies April 2019 Flashcards
(122 cards)
___ emergencies can include many types of incidents, such as:
- Victims stranded (on rocks, in creeks, rivers),
- Victims falling through the ice at a local lake or retention pond
- Vehicles trapped on a flooded roadway.
pg 1
Water rescue
The Northern Virginia region recognizes the levels of certification as outlined by NFPA ___ and ___.
pg 1
NFPA 1670 and 1006
This feature is evident downstream of low head dam type hydraulic.
pg 2
boil line
- The boil line marks the area where the current splits direction of flow.
- The lighter aerated water further up- stream is moving back towards the hydraulic while the darker water is moving downstream
___ is formed when two separate flows meet.
pg 2
Confluence wave
___ is the flow of the water tends to travel in a straight line (vector) until it comes into contact with an object, shore, or bank.
pg 2
Current Flow
The current does not always follow the shoreline due to this straight movement.
___ is the direction the water is flowing
pg 2.
Downstream
___ is water being pushed through a narrowing gap causes the level to rise up forming a chute or a tongue.
pg 2
Downstream V:
This indicates the deepest part of a channel and is where a rescuer should swim and/or bring a boat.
___ are personnel/crew assigned to operate downstream of incident.
pg 2
Downstream Safety
- These units ensure the safety of both the rescuers and victims by providing egress from the immediately dangerous to life and health (IDLH) area.
- Crews should have appropriate personal protective equipment (PPE) and resources available to include radios and throw bags.
___ is a reversal of water flow from downstream to upstream, caused by negative pressure void formed by passing water.
pg 2
Eddy
The water actually flows back upstream towards the object and is considered a SAFE area while boating or swimming.
___ is a line of swirls caused by the reversal of the eddy and the downstream flow of the water.
Eddy Fence
- The friction between the two currents causes a spiraling effect in the water that can be sufficient enough to drag a swimmer under water or flip a boat.
- This line is usually evident by sight.
___ is the process by which a boat moves across the river without moving down stream
pg 3
Ferry
___ is using the force of the water to assist the movement of a boat or a swimmers body to the target.
Ferry angle
Maintaining a 45o angle to the current a swimmer or boat can traverse the water with less difficulty.
___ is an artificial channel used to move floodwater away from an urban area.
pg 3
Flood Channel
- These channels are normally designed as a part of the storm water removal system.
- The current in this channel may be up to twice the speed as the main current.
___ is when a person’s lower extremity becomes entrapped while operating in moving water.
pg 4
Foot Entrapment
- The force of the water pushes the person’s body downstream of the entrapped body part not allowing removal without assistance.
- The person’s airway becomes compromised and drowning will result unless immediate action is taken to secure airway and rescue the victim.
___ is the feature is evident by the points on the outside of the hole facing towards you if looking at the hole from up-stream.
pg 4
Frowning Hole ☹️
- If you mentally flip the whole up towards you it makes a frown.
- This hole will tend to hold a rescuer due to the nature of its shape.
- Since there is a reversal of flow as with all hydraulics, the rescuer will be kept in the bottom of the arc until swimming out and/or rescued.
As water passes along the sides of the shore it creates circular swirls resulting from friction called ___.
pg 5
Helical Flow
- This helical pattern lends itself towards drawing water from the shoreline and pulling it in towards the main current flow in the center.
- This is the reason that anyone within 10 feet of the water’s edge must wear a personal flotation device (PFD).
___ is water pouring over an underwater feature creating a void that will be backfilled by water traveling the opposite direction (upstream).
pg 5
Hydraulic (smiling hole, frowning hole, low head)
- This also creates a recirculation effect and the water becomes aerated by this churning.
- A boil line is usually evident downstream of the hydraulic and indicates the line where the water is flowing downstream yet again.
___ is a movement of water caused by pressure.
pg 5
Hydraulic Effect:
___ is the lowering of the body’s core temperature occurring when the body loses heat faster than it can produce.
pg 5
Hypothermia
Hypothermia can cause impaired judgment, debilitation, and eventually, death.
The opposite shore to the outside bend is where water tends to be moving slower is called ___.
pg 5
Inside Bend:
- Objects and debris can accumulate in these areas.
- In high water, strong eddies may be present.
Water moves in layers, one upon the other from the bottom. Each subsequent layer moves faster than the last. This is called ___.
pg 5
Laminar Flow
the top layer of water is moving slower than that of the bottom.
This hole will tend to keep recycling the rescuer/victim in and out due to the nature of the shape is called ___.
pg 6
Low Head Dam
- This feature is evident by the perpendicular line formed if looking at the hole from up-stream.
- Since the reversal is perpendicular to the face of the object, the rescue/victim will be continually recycled through the hydraulic coming up in roughly the same location each time until rescued.
- These are killing machines and should be avoided.
Operational zones for inland water incidents are as follows:
pg 6
Hot
- in or over the water/ice is considered IDLH.
- Appropriate PPE is required.
- It is recommended that only Technician level personnel operate in the Hot Zone.
Warm
- within 10 feet of the water/ice, if conditions warrant the distance can be increased.
- This area is also dangerous and PFD’s are required.
- Operations Level personnel and below can operate in the Warm Zone.
Cold
- greater than 10 feet from the water/ice.
- Any untrained personnel operate in the cold zone.
*Note -The distance and locations of the warm and cold zones may be increased as deemed necessary for the incident. Some of the considerations may include but are not limited to geography, weather, topography, or changing conditions.
___ is where the current strikes a bank or shore of a water-way at a turn.
pg 7
Outside bend
The shore can to be undercut and/or eroded with water moving at a steady pace tends to force swimmer or boat into shore.