Catalina 270 Interior Drainage Patterns

While washing the boat thoroughly, I noticed not all areas drain to the bilge. Here's a diagram.

The black arrows show pre-existing water flow. The green arrows show drainage that I added.



Area
Description
Before
After
1
Aft open area below port and starboard lockers (also contains fuel tank). Primary source of water entry here is the aft outside shower.
This area drains to the engine bilge (#3) as well as the areas #2 and #4
I added a small (about 1/2" high) ledge (red line) to route drips preferably to area #4 from where it can drain to the bilge.
2
Enclosed area under port side aft cabin mattress. This area is empty.
This drains nowhere! Water will accumulate here and be hidden under the mattress, making the cabin humid and possibly the mattress moldy.
I drilled a small hole so it drains into the engine bilge (#3).
3
Engine bilge.
This drains nowhere! Water will accumulate until reaching the floor level, then flood the floor and to the bilge.
No change.
4
Enclosed area under starboard aft cabin mattress. Contains electric bilge pump and wiring/hoses.
This drains well to the bilge.
No change.
5
Area containing holding tank.
This drains nowhere! Water will rise until reaching floor level, then flood the wood floor under table and drip through it to the bilge.
Added small drain hole to the bilge.
6
Area containing water tank.
This drains nowhere! Water will rise until reaching floor level, then flood the wood floor under table and drip through it to the bilge. Added small drain hole to the bilge.
7
Area under settee.
This drains nowhere! Water will rise until reaching floor level, then flood the wood floor under table and drip through it to the bilge. Added small drain hole to the bilge.
8
Area under V-berth
This drains to the bilge.
No change.
9
Shower pan
This drains to the bilge.
No change.

Some Pictures

#2 Before

This was the worst of the discoveries. This area not only drains nowhere, but it is well hidden beneath the wood cover and aft cabin mattress. Water could accumulate here for a very long without one noticing.



#5 and #6 After

 

#7 After




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