[EarthResearcher333]

For the Curious: an Optical illusion - Gravity Drain Pipe design flows downward..

For those that may have been puzzled by one of the DWR images, the Drain Pipe angles downslope to the outlets in the walls of the Main Spillway. The DWR image gives the impression of an "upslope" angle (optical illusion). The drains are designed such that any water in the drain piping would flow by gravity alone without any hydraulic pressure from spillway operation.

When the Main Spillway is put into use soon, check out any images on the drain outlets in the Spillway walls. If the main source of drain water is from seams and cracks in the concrete, the recent repairs should have sealed these sources. If the drain water flow remains strong, then this may be an indication of alternate flow source(s) getting into the drains.

Optical illusion - drain pipe to outlet looks to connect in an upward angle.

[abb]

I think you have it about right. It clarifies that manual iso layout sketch I posted upthread.

If the wall drains were 200’ ft apart, and the underslab drains were @ 20’, then each wall drain handled 10 underslab drains. Lots of clay pipe sections with many, many joints.

You electrical types can appreciate this: each joint connection represents a potential leak and weak point.

Electrical control wiring is the same principle. You always try to make complete wire runs between terminal points to minimize splices. Each wire splice is a place where interference and static can be introduced into the system.

[WildHighlander57]

Many many thanks for your excellent analyses and pictures!!!!

In this picture, look near the two white rolls (blueprints?) I noticed a dark squiggly line going from them towards the camera location, angled to the left foreground of the picture.

A crack?

[mad_as_he$$]

I got a chuckle out of this image:

https://pixel-ca-dwr.photoshelter.com/galleries/C0000OxvlgXg3yfg/G00003YCcmDTx48Y/I0000Tvgq5P8hDNU/FL-Oroville-9102-jpg

[Repeal The 17th]

Thanks, ER333,
You put so much thought and effort in all of these posts.
I think the arrow in your first picture in #2354
http://www.freerepublic.com/focus/news/3524221/posts?page=2354#2354
does not point to a bell coupling, but simply to a male end,
the bell coupling should point up-slope.
That is the only way I have ever seen VCP laid.