NEN EN ISO 11812 : 2002

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 General requirements
   5.1 Loading and measurement conditions
   5.2 Requirements for 'watertight' cockpits and recesses
   5.3 Requirements for 'quick draining' cockpits and recesses
   5.4 Closing appliances
6 Requirements for quick-draining cockpit bottom
   6.1 Minimum cockpit bottom height, H[B,min]
   6.2 Exception to 6.1 for recesses or lockers
       6.2.1 Exception up to 10 % of cockpit bottom area
       6.2.2 Lockers in the cockpit bottom
7 Requirements for drainage of quick-draining cockpits
   7.1 Cockpit drainage
       7.1.1 General
       7.1.2 When the boat is upright
       7.1.3 When the boat is heeled
   7.2 Draining time
   7.3 Number of drains
   7.4 Minimum drain dimensions
       7.4.1 Internal dimensions of the drain
       7.4.2 Eventual protective grids
   7.5 Centreboard housings and other types of drain
   7.6 Drain fitting
   7.7 Drain piping design and construction
   7.8 Draining time assessment
       7.8.1 General
       7.8.2 Measurement of the draining time
       7.8.3 Calculation of the draining time
       7.8.4 Quick method of calculation for cockpit fitted
             with two drains
8 Requirement for sills
   8.1 Sill height for watertight cockpits
   8.2 Sill height and other requirements for quick-draining
       cockpits
       8.2.1 Sill-height measurement
       8.2.2 Requirements for sill height of quick draining
             cockpits
       8.2.3 Requirements for companionway doors and appliances
             above sill height
       8.2.4 Other requirements
9 Watertightness requirements
   9.1 Watertightness requirements of watertight cockpits
   9.2 Watertightness requirements of quick-draining cockpits
       9.2.1 Watertightness of the cockpit
       9.2.2 Permanently open ventilation openings
10 Owner's manual - Documentation
Annex A (informative) Examples of single-plane cockpit bottoms
Annex B (normative) Analysis of multi-level cockpit bottom
Annex C (normative) Draining time calculation using tables
Annex D (normative) Alternative method of calculation - Direct
         calculation with head losses
Annex E (normative) Watertightness tests
Bibliography

Specifies the requirements for cockpits and recesses to be designated either as 'watertight' or as 'quick-draining' on small craft of hull length up to 24 m. It does not set requirements for the size and shape of a cockpit or recess, nor when or where it shall be used. It only considers draining by gravity, and not by pumping or other methods.