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Thanks OkieGranny, that helps immensely. I could not get the google images of the area nearby the address of find to load. Your pic above would seem to be the most likely location for the body based on what little we know. So runoff from lake during heavy rains or high lake water levels. Makes sense as the trail and surrounding roads would not be at risk of washout of flooding if water has somewhere to go. So now I am back to her possibly having been dumped in the lake originally, possibly quite easily from Webb Chapel or another road which travels over the lake.
Under that premise, I am doing some reading on submerged bodies and what factors affect their eventual rising, either partially or completely, because if she was tossed (or jumped) from a roadway directly into water, submerged and then I think it's possible that as she began to surface she became washed into the drainage pipe. Anyway, I wish I had found this information when following the Dermond couple murders.
The spoiler contains sometimes graphic clinical information about how bodies behave when submerged and why. Some covers drowning specifically but most of the information would seem to apply regardless of manner of death.
Under that premise, I am doing some reading on submerged bodies and what factors affect their eventual rising, either partially or completely, because if she was tossed (or jumped) from a roadway directly into water, submerged and then I think it's possible that as she began to surface she became washed into the drainage pipe. Anyway, I wish I had found this information when following the Dermond couple murders.
How long this takes depends on the depth and temperature of the water, the amount of sunlight the corpse receives, and whether it is lying under a ledge or a bridge.
Whether the body is lying on the north or south side of a waterway can also affect the time it takes to rise, because heating of the water varies on each bank.
Obviously, the body can take longer to rise if it is underneath something like a tree, or is caught by an underwater obstruction. I once studied a body that had risen to the surface with part of a brick wall tied to it by ropes around the chest. There were five bricks covered with mortar on each side of the body and still it floated.
What's more, if a body is trapped by, say, its leg, the gases will keep forming until it is buoyant enough to detach itself from the trapped leg and rise up.
Bodies can also be washed into the side of a river and remain undiscovered, below an overhanging tree, for example.
Debris piles up on top of the body and silt accumulates. If the body lies out of the Sun's rays, which cause much more rapid decomposition, it can remain there until a flood washes away the silt and debris.
http://myqacorner.blogspot.com/2012/01/why-do-corpses-sunk-in-water-eventually_01.html
The drowning victim's body typically sinks shortly after death. It will resurface 3 days to 3 weeks after death. The surfacing is caused by bloating, which increases the volume of the body without increasing the weight. Sometimes, because of air trapped in the clothing on the victim, the body will not sink at all. In really cold water, the putrefaction process is very slow, and the body may not bloat up, so it will not resurface for a very long time. Lake Superior is said to be too cold offshore for a drowning victim to decompose, so that they never surface.
http://dmmoyle.com/simeans.htm
Bodies that are dead before they reach the water could have different floating patterns. A corpse that falls in face-first might remain on the surface, since there would be no way for the air inside the lungs to escape. (A faceup corpse would fill with water and sink in the normal fashion.)
http://www.slate.com/articles/news_and_politics/explainer/2005/09/dead_mans_float.html
The human body is slightly heavier than fresh water. Consequently, when
unconsciousness takes place, the body sinks. Fat bodies are slightly more
buoyant than thin bodies, but still all bodies will sink in fresh water. If there is
considerable clothing on the body along with shoes, articles in the pockets and
other paraphernalia, it renders the body considerably less buoyant. The question
is often asked, "When a body sinks, how far down will it go?" There is some
dispute on this point, but the very best evidence indicates that a body will go to
the bottom regardless of how deep the water may be, unless it meets with some
obstruction or upward current which tends to prevent it. As a body sinks into
deep water, the pressure of the water tends to compress gasses in the
abdominal and chest cavities with the result that the body displaces less water as
it sinks deeper and consequently becomes less and less buoyant, the further
down it goes http://www.operationtakemehome.org/sar/Fire and Rescue Personnel/Biology of drowning.pdf
Whether the body is lying on the north or south side of a waterway can also affect the time it takes to rise, because heating of the water varies on each bank.
Obviously, the body can take longer to rise if it is underneath something like a tree, or is caught by an underwater obstruction. I once studied a body that had risen to the surface with part of a brick wall tied to it by ropes around the chest. There were five bricks covered with mortar on each side of the body and still it floated.
What's more, if a body is trapped by, say, its leg, the gases will keep forming until it is buoyant enough to detach itself from the trapped leg and rise up.
Bodies can also be washed into the side of a river and remain undiscovered, below an overhanging tree, for example.
Debris piles up on top of the body and silt accumulates. If the body lies out of the Sun's rays, which cause much more rapid decomposition, it can remain there until a flood washes away the silt and debris.
http://myqacorner.blogspot.com/2012/01/why-do-corpses-sunk-in-water-eventually_01.html
The drowning victim's body typically sinks shortly after death. It will resurface 3 days to 3 weeks after death. The surfacing is caused by bloating, which increases the volume of the body without increasing the weight. Sometimes, because of air trapped in the clothing on the victim, the body will not sink at all. In really cold water, the putrefaction process is very slow, and the body may not bloat up, so it will not resurface for a very long time. Lake Superior is said to be too cold offshore for a drowning victim to decompose, so that they never surface.
http://dmmoyle.com/simeans.htm
Bodies that are dead before they reach the water could have different floating patterns. A corpse that falls in face-first might remain on the surface, since there would be no way for the air inside the lungs to escape. (A faceup corpse would fill with water and sink in the normal fashion.)
http://www.slate.com/articles/news_and_politics/explainer/2005/09/dead_mans_float.html
The human body is slightly heavier than fresh water. Consequently, when
unconsciousness takes place, the body sinks. Fat bodies are slightly more
buoyant than thin bodies, but still all bodies will sink in fresh water. If there is
considerable clothing on the body along with shoes, articles in the pockets and
other paraphernalia, it renders the body considerably less buoyant. The question
is often asked, "When a body sinks, how far down will it go?" There is some
dispute on this point, but the very best evidence indicates that a body will go to
the bottom regardless of how deep the water may be, unless it meets with some
obstruction or upward current which tends to prevent it. As a body sinks into
deep water, the pressure of the water tends to compress gasses in the
abdominal and chest cavities with the result that the body displaces less water as
it sinks deeper and consequently becomes less and less buoyant, the further
down it goes http://www.operationtakemehome.org/sar/Fire and Rescue Personnel/Biology of drowning.pdf
