P3 primary element
0 = exponential device
1 = BS-3680 Rectangular Flume
2 = BS-3680 Round Nose Horizontal Crest Weir
3 = BS-3680 Trapezoidal Flume
4 = BS-3680 U-throated Flume
5 = BS-3680 Finite Crest Weir
6 = BS-3680 Thin Plate Rectangular Weir
7 = BS-3680 Thin Plate V-notch Weir
8 = Rectangular Weir (contracted)
9 = Round Pipe
10 = Palmer Bowlus Flume
11 = H Flume
12 = Universal Head vs. Flow
13 = Rectangular Area x Velocity
14 = Trapezoidal Area x Velocity
15 = Modified Trapezoidal Area x Velocity
16 = U-channel Area x Velocity
17 = Circular Area x Velocity
18 = Gull-wing Area x Velocity
19 = Egg-shaped Area x Velocity
20 = Universal Area x Velocity
上面是P3的选型参数，其中1~7项都有BS-3680字样，BS如果薄壁堰，1，3，4项都是槽啊。
您发的邮件我查看了下邮箱里面没有。