Welcome, always glad to see a new SD owner join up. Where do ya boat at? As to your prob:
As other have said, hatch, windshield, and anchor locker are the usual culprits for leakage. Also, an ill-fitted or worn cover can let water channel down the gunwales into the engine/bilge compartment.
mattlow wrote:
I'm not sure about the drainage as yet as I've just got it, im in salt water 90% of the time.
There should be 3 compartments in your SD. The cuddy, the fuel tank area, and the engine/bilge compartment. Each of these is separated by a bulkhead that has a 1 inch diameter hole. The cuddy is the highest and the engine bilge is the lowest, this allows water to flow aft to the bilge pump or out the drain plug (if on a trailer or lift). However, water will flow fore if there is enough in the bilge or your boat is in a bow down angle.
ric had the best advice for checking the hatch and windshield, have someone spray a hose while your inside checking. The anchor locker leak is a little tougher to see because they will leak behind the forward bulkhead and flow into the compartment under the seats in the cuddy. The best way to test that, is to make sure those under seat compartments are dry, then fill up the anchor locker with water. If it leaks into the under seat compartments, the easy fix is to dry out the anchor locker, then use any good sealant in the bottom. A lot of folks will use spray foam to bring the bottom of the anchor locker up to the level of the drainage hole.
Again, welcome! Lets see some pics of your boat!