Tanking?

[MangoPete]

I live on a hill. I have an access road at the backof my house which was used for bincarts and coal carts. My old coal shed is 3 metres below this road and when it rains the wall become soaked and water runs outs oif the door. I would like to use it as a shed but it isn't dry. How do I make this wall waterproof to make a dry shed for my boys bikes and lawn mower etc>
Thanks

[logman]

I find it a bit difficult to picture your lay-out but it sounds to me, you may need to look into flexable drainage pipes (perferated) under the surfice to chanel away exess water. Of course you will have to make sure you dont flood some other poor person out ! Why not ask the grounds people at the local golf course, they should know a lot about drainage and may even have some old off cuts laying aroud the yard