[Shop-talk] culverts

[Brad Kahler]

Since we moved into our new house in Kentucky a few months ago I've been 
watching how rain water flows across the yard, driveway and pastures.  
In one place on the driveway the previous owners had put a culvert.  
This culvert was open on the uphill side but for some reason they 
covered up the downstream side with dirt.  Oddly enough the water 
doesn't flow over the top of the driveway like I would have expected so 
I went searching for the reason.  What I found was over the years the 
water flow has created a couple of underground passages that travel for 
5 or 6 feet (probably more) before working their way to the surface. 

We're going to be doing some grading of the land in the general area of 
where the culvert is for placement of a new shop so I'm going to have to 
find a way to extend the existing culvert maybe 20' or more.  I've 
purchased a couple of 20' plastic culverts but I unsure how to tie the 
existing steel culvert to the new plastic culvert.

Any suggestions on a means to accomplish this feat?

Thanks!

Brad