Too late for smaller holes, fabric, multiple filter materials, etc. The 4" pipe with 1/2" holes at 7 & 5 o'clock is 7' deep under ASTM C-33 concrete sand. It was already covered with sand before my original post. There is a more expensive 6" pipe above it and I will not be digging this out...
I was looking at 'General requirements' number 3, the "basic rules" you pointed out at the bottom of your picture.
'3. To avoid movement of filter in drain pipe perforations or joints: D85 F/2 > 1'
The chart shows D85 of concrete sand to be 2 (looks like 2mm). According to the calculation the...
Does this mean that concrete sand is good for perforations up to 2" in size?
Update: I have both pipes buried and most of the trench filled. I am out of sand and have 26 more tons on the way. I have used 195 tons so far.
Barasingha
The site is dual sloped, down hill and parallel to the hill. The perf pipes are sloped for their entire length 1/8" per foot. The 6" drain tiles are sloped 1/4" per foot along their entire length. There are two exits to the trench and a single high point located at a 90^ turn in the trench...
emmgjld:
To get serious about compaction for a minute, I would like to explain myself.
I used this bulletin as my guide: http://www.jmeagle.com/pdfs/Technical%20Bulletins/TB06DepthofBurialforPVC.pdf
My calculations resulted in a 6.5-8.5% deflection at the deepest point of my trench (7ft), a...
Oldestguy:
I have unsuccessfully tried to find the study about concrete sand being a good filter by the Corp of Engineers in 30's. Have any leads for me?
Barasingha
The complete trench will be filled to the surface with the sand. The high point is at a 90^ turn in the drain--the only hard turn--and I wanted to have a "cross" fitting with a clean out each way but the supply house did not have a 4" cross so clean outs were omitted.
The perforations are...
After above average rain last winter the site of my future home seeped for months. The site is carved into a hillside of highly decomposed limestone/shale/mudstone/etc. Basically a yellow/gray clay bed with caliche/adobe layers above.
The seep stopped this summer and I am now trying to beat...
