Drainage around 30yo house

[bigballer]

I am having some drainage problems at one corner of my house and as a result the crawlspace has standing water in it most of the winter. I believe the problem is 3 fold. The house sits on a slope and we get alot of runoff from above all winter long. Behind the house (on the high side) there is a linear french drain that runs the entire length of the house (sits about 25ft from the foundation). Obviously it's not working properly because it should be catching the water coming off the hill (both surface and sub). The other problem is that I have 4% negative drainage. The grade at the foundation is 12" lower than the grade at the french drain (25ft from house). The last potential problem is that I believe (have not yet dug up) the corner downspout drains into the clogged FD via a 4" solid flex pipe. The first and 3rd problems are easy to overcome, clean out FD and dig up downspout flexpipe and reset. The problem I am having is weather or not to regrade around the house. If I can get the FD cleaned out and working properly, will that be enough to keep my house dry?? If I do the grading I will have to remove at least 35Cubic Yards of dirt to get a 6" drop from foundation to FD which is alot of dirt. I will also have to dig the FD deeper. One question regarding the FD, does it need to be lower (in grade) than the floor of the crawlspace?

These are the tools I have: Backhoe, BoxScraper, Landscape Rake, FEL with toothbar.

Any ideas/suggestions are welcome!
Thanks!

<crossposted to rural living forum>

 

[Egon]

How about a picture and more details about the surrounding area.

What kind of moisture do you get??

Where is the water table at??

What kind of soil?? Permuability and percolation?

 

[Bird]

This is a duplicate of a post in the Rural Living forum. We try to discourage duplicates in different forums. Closed.