The Brew Cabin

Dear Tony,

I will be possibly laying a gravel drive in the near future. I haven't checked the existing levels properly as yet but it looks like it may slope slightly towards the bungalow. Is it necessary to install linear drainage channels or will surface water drain okay through the sub-base which will be 100mm compacted type 1?
Regards
Gary

Generally speaking, any surface water will drain through the sub-base, but then, if the sub-grade is clay or some other impermeable or semi-impermeable material, it can take some time for the water to escape, and this results in temporary ponding.

If you have any reason to suspect that the sub-grade might be troublesome, and if you have easy access to a SW drain point, it's well worth dropping in a gully or a length or linear drain at the lowest point of the proposed driveway, just to be on the safe side. If there is a backfall towards the property, then a few metres of cheap linear drain, positioned a couple of metres or so in front of the building, will help ensure your visitiors keep their feet dry.

Many thanks for your reply
Regards
Gary