-- [TANKS]

create type tanks_overflow as enum ('YES', 'NO');

create table tanks
(
  id varchar(32) primary key references _node(id)
, elevation float8 not null
, init_level float8 not null
, min_level float8 not null
, max_level float8 not null
, diameter float8 not null
, min_vol float8 not null
, vol_curve varchar(32) references _curve(id)
, overflow tanks_overflow
);

-- unset vol_curve when delete curve