Never seen that before. Obviously a complete road profile should show left & right profiles, but the mechanics of a road profile has to based on the centerline. I think your client needs to stop being the engineer. The elevation change in the left hand turn lane has to be obsorbed in the reduced...
I'm not sure if it's the same thing but I bought the circular wheel "Water Flow Calculator" from Forestry Supply http://www.forestry-suppliers.com/product_pages/View_Catalog_Page.asp?mi=3400
I use it for getting a rough idea on feasibilities of drainage systems.
To expand on EXXIT's comments, I use "laydel" also. However, after typing in "laydel", it will prompt you to "Select object on layer to delete or [Name]:" Enter in "n". A window will open to select the layers you want to delete. You can make multiple selections. Make sure that the layer(s) you...
Manholes are used often for large valves and/or a series of valves, or for large metering and pumps. But I refer them as vaults (manholes for water systems) that allow whole body entry. Google water-vaults, meter-vaults...As mentioned in another thread, manholes are defined as a structure large...
I have another reason for drops: For a design concept, I had the invert of an 8" entering a 24" at the spring line. The City engineer had me change that so the invert of the 8" is now at the top of the 24" pipe. The reason for this is that the flow of the 8" will not be inhibited by any back...
A two point connection should almost always be required. Not so much for adequacy of pressure and flow, but more for safety. If one connection point is broken or shut off for repairs, then at least the flow can come from the other connection point. Even if the points of connection were...
Daniel, I do a lot of residential design. Therefore, I use the city/developmental/engingeering website and usually download their specs/design standards and such. I also use the County Recorder sites for property information and the state department of environmental quality. Also "FEMA" for...
A good source to find infiltration rates here in AZ is the local drywell installer. Maybe you have one in PA. The guy here has been installing d-wells for three decades. You can tell him where you need a well and he will provide you with a infiltration reports for drywells nearby.
TerraSouth, not sure if you are asking me, but I'll comment anyway. Now that you talking about roof drainage, that's quite different than methane mitigation. Even if the pipes used for methane transfer defelct, crack, even be crushed, there is a good chance the system will work to some degree...
HDPE is stronger, however I cannot see using it in this situation. I have used lots of 4" PVC for vapor extraction under slabs and driveways where tanker trucks park. Specify sand for bedding for good haunch support. Top that off with pea gravel at least a couple of inches over the pipe with a...
Yep, Here in AZ, we have had many developments go up on dairy land, and the manure has to go. The trick is to find someone who is trying to get rid of excavated soil. You'll also have to watch for deep holes of manure since some farmers had a tendancy to dig a big trench and fill it with manure...
One of the best ways I have learned about grading is driving around town and see how grades are in the real world, especially after a heavy rain. Try to visualize how the equalateral grades wrap around a highway, structure, retention basins, or anywhere the grade had been altered. Erosion from a...
I often use the Means Construction Estimating manual for getting close enough without being an actual bidder. I use it to get Engineers Estimates often required along with a design. You can also see posted bid results on municipal web sites. Google "bid tabulation" and I'll bet you find a price...
So the term structural is implied if it references design callouts such as ...grade preparation, base course thickness, compaction, thickness of binder and surface, and other design criteria, correct? If so, maybe that's why I was confused when I would hear the term and then not hear it when...
Thanks to all who responded. I was really looking for a convincing argument to only match crowns, whether it was an 8 to 10 inch and 8 to 12 inch. It sounds like there really isn't. Thanks.
I also forgot to ask: If the larger pipe is put at a lower invert (say 5"), then how is the drop to the flow line handled for the inlet? Is there a steep flow line inside the manhole or does it just drop from the height?
In a manhole when matching an 8-inch sewer line inlet with a larger line outlet, say 18-inch, do you match the pipe crowns or match the inverts (maybe with a 1/10' drop) or what?
Yeah, I have had it both ways also. Sometimes the waterworks department will do it, sometimes not. If there are any questions to the reliability or who will do it, it's best to hire a firm that will do it. I would start with calling the fire department and ask them who can do the test. And maybe...
