How to add drainage for low level deck?

[dave_022]

I am looking to utilise the space under our current deck for another decked area extending to the fence to increase the pool area (moving fencing back which will cut across new deck area)

The issue I have is clearances, the current under deck height is 2100. Therefore the preferable height would be for the deck to finish level with pool slab which is 100mm from ground.

In order to do this I am aware I would need to dig down. I was planning to use joints on tuff block to keep it as low as possible. Although the under-current deck area will be sheltered by the top deck and roof from some rain I am still concerned about pooling under the deck if it effectively sits in a pit. What would you recommend for drainage solutions? or is this overall an unworkable idea?

[dave_022]

Unfortuinately the storm water pipe runs down the side of the pool closest to the house and as the pool slab is 100mm higher than the rest of the area then that is not a direct connection. The other side of the slab runs very close to the fence to another block wall, so no way out there either. Would some kind of sump and pump work?