A surge gate for blocking a surge of water includes a sleeve disposed below a waterline of the water, wherein the sleeve has an open upper end and a closed lower end, and a piston slidably disposed in the sleeve, wherein the piston is configured to rise vertically within the sleeve along a vertical axis between a first position with an upper end of the piston positioned below the waterline, and a second position with the upper end of the piston positioned above the waterline.

An automatic water control system for open ditch drainage includes a drainage control apparatus that is designed to be disposed in a drainage ditch and to control the water level in the drainage ditch, as well as the water table level in the field.

An automatic water control system for open ditch drainage includes a drainage control apparatus that is designed to be disposed in a drainage ditch and to control the water level in the drainage ditch, as well as the water table level in the field.

A system for selectively closing a fluid flow channel may include a gate apparatus with a gate structure and a guide frame assembly guiding movement of the gate structure between closed and open positions. The guide frame assembly may define a passage opening and include a gate threshold with a threshold plate having an opening perimeter forming the passage opening. The opening perimeter may be formed by an edge of the threshold plate, and the opening perimeter may have a lower perimeter portion. The gate structure may have a gate plate with a perimeter edge including a lower edge portion. The lower edge portion of the gate plate may bypass the lower perimeter portion of the threshold plate when the gate structure moves toward the closed position to form a first shear point to shear any plant material extending through the passage opening.

A system for selectively closing a fluid flow channel may include a gate apparatus with a gate structure and a guide frame assembly guiding movement of the gate structure between closed and open positions. The guide frame assembly may define a passage opening and include a gate threshold with a threshold plate having an opening perimeter forming the passage opening. The opening perimeter may be formed by an edge of the threshold plate, and the opening perimeter may have a lower perimeter portion. The gate structure may have a gate plate with a perimeter edge including a lower edge portion. The lower edge portion of the gate plate may bypass the lower perimeter portion of the threshold plate when the gate structure moves toward the closed position to form a first shear point to shear any plant material extending through the passage opening.