State type of notches?

There are several types of notches, including V-notch, U-notch, square-notch, and round-notch. Each type of notch is designed for specific applications and materials.

Circular Notches:
- U-notch
- V-notch
- Rounded-U-notch
- Parabolic-notch
- Trapezoidal-notch
- Triangular-notch

Rectangular Notches:
- Rectangular-notch

Oblique Notches:
- Single-oblique-notch
- Double-oblique-notch

Compound Notches:
- Cipolletti-weir-notch
- Thompson-notch
- Trautwine-notch
- Francis-notch

Other Notches:
- Triangular-notch with crest
- End-contracted-notch
- Side-contracted-notch
- 90-degree-notch
- Sharp-crested-notch