DITCH PITCH ?: Landscape Design  -- Landscape Discussion Forum and Review DITCH PITCH ?: Landscape Design -- Landscape Discussion Forum

  parts   |   manuals   |   discussion   |   photos   |   podcast   |   reviews   |   specs   |   dealers   |   classifieds   |   contact   |   faq   |   myProfile   |   home          Login Now | Sign Up


FAQ:   What is a tractor?

Forum Index
New As Posted | Active Subjects



www.emerichsales.com - New & Used Equipment
          View Tractors For Sale!


www.partsbynet.com - Lawn and Garden Equipment Parts


Bernardsville Landscape Lighting
Click to Post a New Message!

Discussion Boards > Active Subjects > Messages as Posted > Landscape Design Forum

Page [ 1 ] |
Reply | Pop Up Window Reply | Add PhotoAdd Photo
 06-01-2005, 09:26 Post: 111800
lbrown59

TP Contributor

Join Date: Sep 2004
Location: First Organized Permanent Settlement In The Northwest Territory.
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 931

2
Filter by User
 DITCH PITCH ?

I want to add 100' to my existing 40 foot driveway culvert.
Plan on using 5 20' joints of corrugated 15'' double wall smooth bore plastic pipe.

How much lower than the upper end should the lower end of the culvert be?

I'm thinking 12''.
Would that be enough or should it have more slope than that that?






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

 06-03-2005, 12:02 Post: 111906
k9fletch



View my Photos

View my Photos  Pics
Join Date: Jul 2003
Location: Whittemore, MI
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 52
 DITCH PITCH ?

12" should be good, I think the basic rule of thumb for drain pipe is 1/4" of drop per foot of length, but with larger diameter pipe you can lessen the grade. Just my opinion






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

 06-03-2005, 12:32 Post: 111909
Murf

TP Contributor

View my Photos

View my Photos  Pics
Join Date: Dec 1999
Location: Toronto Area, Ontario, Canada
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 7004
 DITCH PITCH ?

A 1 foot drop on a 100 run is only a 1% grade.

That's not much fall, and I'd be concerned that such a shallow grade could easily be negated, or in fact reversed by just a little settling of the ground.

Generally you don't want anything less than about 3% for natural drainage.

A reduced slope will also cause very slow water flow rates. If you are in an area with cold winters and or silty soil a 1% slope may not allow the water to run fast enough to adequately carry away silt buildups or prevent freezing of melt water.

Best of luck.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

 06-03-2005, 14:43 Post: 111919
MacDaddy



View my Photos

View my Photos  Pics
Join Date: May 2004
Location: Western NY
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 92

2
Filter by User
 DITCH PITCH ?

Just make sure your pipe size is at least as large as the next culvert downstream from yours (assuming it is reletively nearby). That way you have some insurance that it is sized properly to handle normal flow, as well as storm events. 1% is fine for a 15" pipe. You could even flatten it a bit if you need to. Though I wouldn't go any less than .5' drop invert-to-invert. You want to maintain flow at about 3ft/sec. which will keep the pipe clean. 1% (as you intended) should be good. Also consider installing 5-10' of medium stone rip-rap at either end. This will also help to keep out silts and sediments. Good Luck.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

 06-04-2005, 08:54 Post: 111939
lbrown59

TP Contributor

Join Date: Sep 2004
Location: First Organized Permanent Settlement In The Northwest Territory.
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 931

2
Filter by User
 DITCH PITCH ?

1*Just make sure your pipe size is at least as large as the next culvert downstream from yours (assuming it is relatively nearby).
2* 1% is fine for a 15" pipe. You could even flatten it a bit if you need to.
3*Also consider installing 5-10' of medium stone rip-rap at either end
to help keep out silts and sediments.
MacDaddy
===============
Thank you for your above reply.
It was much appreciated as it was very informative & helpful for me.

1*The 15 inch was approved on my permit.
2*I have decided on a 3" drop for each 20 foot culvert thus the lower end of the 100 foot run will be 15 inches lower than the upper end rather than the 12 inches I had originally planed on. The result is a pitch slightly greater than 1 %.
3*The state told me they may do just that in the 75 feet of ditch from the upper end of the culvert to the upper edge of my property line.
This has given me second thoughts about the whole culvert project and makes me wonder if I'm taking on the states responsibility to maintain the road way ditch by installing the 100 feet of culvert!
I have a question about the stone rip-rap - How do I prevent the stone from washing into the culvert in a real gully washer?







Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

 06-06-2005, 07:22 Post: 111973
MacDaddy



View my Photos

View my Photos  Pics
Join Date: May 2004
Location: Western NY
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 92

2
Filter by User
 DITCH PITCH ?

1.25% should be fine. Generally, you match the proposed grade of your pipe with the existing grade of the ditch bottom (assuming the bottom has at least .5% grade). If you create too much of a drop, you will wind up regrading the ditch from the downstream end of your pipe until it daylights (hopefully still on your property). I guess what I am saying is that (1.% grade is PLENTY of pitch for a 15” HDPE pipe). Don’t make more work for yourself b/c you think you need to have it steep to convey flow. Also, if you can shallow the pitch of your pipe and create a free-discharge (little waterfall) on the downstream side, this will prevent back-silting.

I mentioned medium stone rip-rap before. I don’t know your situation. It may be overkill for a driveway culvert. These stones are about 75+lbs each and should be fine in almost all situations.

Also, make sure you have (at least) 1’ cover over the pipe, and depending on the weight of the vehicles crossing it, you should probably use select-fill under the driveway crossing. Gravel s/b fine for light traffic.

In our area, this type of work would be the homeowner’s responsibility. However, all future maintenance of the ditch would be done by the Highway Dept.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

 06-06-2005, 10:44 Post: 111982
yooperpete



View my Photos

View my Photos  Pics
Join Date: Jan 2004
Location: Northern Michigan
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 1413
 DITCH PITCH ?

I would also recommend looking into the depth of the ditch and placement. Is the ditch in need of dredging soon where they could take out 2" to 4" of the ditch bottom area? Is the water flowing good right now?






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

Reply | Pop Up Window Reply | Add PhotoAdd Photo


Page [ 1 ] |

Discussion Boards > Active Subjects > Messages as Posted > Landscape Design Forum

Thread 111800 Filter by Poster:
k9fletch 1 | lbrown59 2 | MacDaddy 2 | Murf 1 | yooperpete 1 |




Most Viewed

+ How to estimate the weight of boulders?
+ bridge for Island
+ ditch retaining wall construction
+ fencing
+ Need advice on building a privacy barrier w/ dwarf
+ Mulch Of Choice?
+ Retaining wall backfill, step building questions
+ Rope Fence for Pool Yard Entrance
+ Is My Retaining Wall Level?
+ Short Moss Rock Retaining Walls

Most Discussion

+ bridge for Island
+ Mulch Of Choice?
+ Need advice on building a priv
+ What can I put along the found
+ Terracing my property
+ fencing
+ ditch retaining wall construct
+ Working around retaining wall
+ Is My Retaining Wall Level?
+ Privacy fences

Newest Topics

+ Lawn renovation
+ POSTED SIGNS
+ fencing
+ Post hole digging
+ Retaining wall backfill, step building questions
+ Retaining wall drainage
+ Anyone use Turfgrid?
+ Working around retaining wall obstruction
+ Rope Fence for Pool Yard Entrance
+ Plastic white fence







Turbochargers for Tractors and Industrial Machines
Cab Glass for Tractors and Industrial Machines

Alternators for Tractors and Industrial Machines
Radiators for Tractors and Industrial Machines

Driveline Components for Tractors and Industrial Machines
Starter Motors for Tractors and Industrial Machines