Help with creek crossing

[Jisgren]

Need to put in our main road to our house and cross this creek. It is normally a dry creek and only flows during large rains. Creek is very flat so current does not look too fast. Bank to bank is about 10 ft and depth looks like about 2-3 feet. Any suggestion - culvert, pipe arch, box culvert? Also any idea on size?

 

[Streetcar]

Some question for you
Are there any culverts on same creek close by? Are they working without problems?
How many acres does this creek drain.
What is growing on drainage area? Trees have debris which must get through structure.
What is the highest amount of rain expected in the area
Any other access points if culvert washes out in high rain event

 

[Carl_NH]

Not knowing the amount of water in a large rain, but from the pics the flow area appears to be about 3' w 12" deep

A single pipe arch might work 36" at the base but your cover height needed for heavy loads (cement truck) may be 20" or more. This may be too high making a ramp or needing a lot of fill before and after the stream.

Two 18-20" side by metal culverts with 12-16" compacted cover height would allow the grade to be lower.

Concrete box or similar would probably be best for heavy loads and need less cover - but best to check on the specs for cover on these.

 

[tcreeley]

When the creek is flowing the fastest- what is the depth and width? That is what you have to plan for in sizing your culvert to avoid wash outs. Corrugated culverts come in all sizes - even on craigs list. I have only opinion- but I would think that you would never want as much as a 1/3 of the culvert full during peak flow to avoid a washout.
Found this:

Instructions
Sizing
1
Find the high-water mark of the stream. This is the level at which vegetation meets bare earth and rock. Drive a stake into the high-water line on either bank. Connect the stakes with string and measure the distance.

2
Find the low-water level of the stream. This is typically the level at which the slopes of the stream banks flatten into the stream bottom. Measure the width at this level.


3
Find the depth of the stream at high water. Simply measure the height from the stream bottom to the string marking the high-water line. You can take several measurements and average them if the depth is very irregular.

4
To find the cross-sectional area of the stream, simply take the average of the high-water width and the low-water width and multiply it by the depth at high water. The cross-sectional area of the culvert should be at least 1.25 times that of the stream. If the stream is at high risk of flooding, though, the factor should be 1.75 for 25-year floods or 3 for 50- to 100-year floods. Use the chart in Resources if you need help converting the culvert's cross-sectional area to a diameter.

5
Measure the width of the roadway and its adjacent side slopes to determine the length of your culvert. The length of your culvert should equal this width plus two feet.

Installation
1
Excavate at least 6 inches from the bed of the stream. Follow the slope of the stream when you excavate, which typically measures between 2 and 6 percent. If your excavated slope is less than 2 percent, water can stagnate in the culvert.

2
Fill the 6-inch trough you've created with soil or sand. Pack it in with the soil compactor.

3
Place and center your culvert. All but the smallest of culverts will require a backhoe for this operation.

4
Fill around the culvert with soil or sand. Pack the material in after every 6 inches of fill, and be sure that it is free of rocks. Cover the culvert with at least a foot of fill material.

5
Seed the top of the culvert with grass, or lay sod over it. You may choose to spread and pack gravel over the roadway section. Protect the dirt around the culvert by jamming flat rocks or broken concrete into the stream bed around each mouth of the culvert.



Read more : How to Lay Culverts | eHow

 

[rustyshakelford]

Where is your place located? Looks like grimes county

Brett

 

[Jisgren]

north Hardin County

 

[Jisgren]

Some question for you
Are there any culverts on same creek close by? Are they working without problems?
How many acres does this creek drain.
What is growing on drainage area? Trees have debris which must get through structure.
What is the highest amount of rain expected in the area
Any other access points if culvert washes out in high rain event

About 30-40 acres of pine plantation. No culverts upstream. Will have to cross creek to get out, planning on putting second crossing in later. 90 % of the time the creek is dry. - I was told that someone actually hand dug the creek out years ago to drain a lake on their property.

We just bough the property last April so haven't been out there enough to see creek, although last weekend was the first time I have seen any water in it. That being said this will be our main road so want to do the crossing correctly. I was thinking about 4x3 box culvert with concrete wing walls, but not sure the cost -- don't want to go cheap but need to stay within reason.

 

[meangreanmashean]

I'd ditch the culvert plans and go with a concrete slab. Initial cost is higher, but there's less maintenance. Volume is not an issue either.

 

[Western]

Or, buy a flat rail car, they hold upwards of 100,000k#'s and plenty long. Another option would be a flatbed trailer (semi size), they also have a good load rating.

This place has a distributor in Houston for RC bridges
Paragon home

 

[Tractor Seabee]

I built a 16' X 10' bridge using RR Ties; three 16' stringers setting on 12' sill logs and decked with 2" rough fir deck. I drive my 1 ton dually full of sand or gravel over it all the time. Way back I responded to several of these threads with more details. My creek is similar to yours.

Ron