Check/Drop Stuctures - Precon

By: Precon Precast Products  09-12-2011
Keywords: Water Systems, Precast Concrete, flow control

Precon’s Check/Drop Structure is a multi piece (typically using 9-13 pieces) precast concrete structure that assembles together in the shape of an ‘H’ and is installed in an irrigation canal perpendicular to the flow of water.  The shape of the structure creates a double water cutoff, ensuring that water cannot get around or under the structure, helping prevent bank erosion. 

The Check/Drop Structure is engineered and designed to USBR standards and is a reliable solution for water flow control in a water conveyance system, where there is also a change in elevation.  The Check/Drop Structure allows the designer to control water levels and water velocity, which works well in conjunction with Precon’s Inlet/Turnout as a way to obtain necessary water levels for water delivery.

The structure is designed for canal's with flows as large as 3.0 cubic metres per second. We take into account the width of the canal at the top and bottom, the flow of water, and the type of gate when designing the structure.  The structure can accommodate Overshot, Stop Log Systems and several other popular gate systems.  The Check/Drop Structure can also be used to measure the flow of the water.

Uses

  • Flow control in the storage, delivery and drainage of water systems where there is a change in elevation
  • Weir structure
  • Check structure
  • Basic drop structure

Sizes - All dimensions in mm

Q – Maximum Water Flow (in cubic metres per second)
X – Drop (5 = 500 & 10 = 1000)
S – Canal Slope
A – Wingwall Length
B – Sill Length
C – Structure Width (outside)
D – Upstream Wingwall Height
E – Downstream Wingwall Height
F – Upstream Sill Height
G – Downstream Sill Height

- All Check/Drop Structures can accommodate either stoplog guides or overshot gates

- Please note that the floor slab is NOT precast it is cast in place

Q X S A B C D E F G
1.0 5 2.0:1 3000 2000 3500 2750 2250 1600 1100
1.0 5 2.5:1 3500 2000 3500 2750 2250 1600 1100
1.0 5 3.0:1 4000 2000 3500 2750 2250 1600 1100
1.0 10 2.0:1 3000 2000 3500 3250 2250 2100 1100
1.0 10 2.5:1 3500 2000 3500 3250 2250 2100 1100
1.0 10 3.0:1 4500 2000 3500 3250 2250 2100 1100
1.5 5 2.0:1 3000 2500 4000 3000 2500 1750 1250
1.5 5 2.5:1 3500 2500 4000 3000 2500 1750 1250
1.5 5 3.0:1 4000 2500 4000 3000 2500 1750 1250
1.5 10 2.0:1 3000 2500 4000 3500 2500 2250 1250
1.5 10 2.5:1 3500 2500 4000 3500 2500 2250 1250
1.5 10 3.0:1 4500 2500 4000 3500 2500 2250 1250
2.0 5 2.0:1 3500 2500 4000 3500 3000 2000 1500
2.0 5 2.5:1 4500 2500 4000 3500 3000 2000 1500
2.0 5 3.0:1 5500 2500 4000 3500 3000 2000 1500
2.0 10 2.0:1 3500 2500 4000 4000 3000 2500 1500
2.0 10 2.5:1 4500 2500 4000 4000 3000 2500 1500
2.0 10 3.0:1 5500 2500 4000 4000 3000 2500 1500
2.5 5 2.0:1 4000 3000 4500 3750 3250 2050 1550
2.5 5 2.5:1 5000 3000 4500 3750 3250 2050 1550
2.5 5 3.0:1 6000 3000 4500 3750 3250 2050 1550
3.0 5 2.0:1 4000 3500 4500 4000 3500 2200 1700
3.0 5 2.5:1 5000 3500 4500 4000 3500 2200 1700
3.0 5 3.0:1 6000 3500 4500 4000 3500 2200 1700

Keywords: flow control, Precast Concrete, Water Conveyance, Water Systems,

Contact Precon Precast Products

Email - none provided

Print this page

Other products and services from Precon Precast Products

09-12-2011

Concrete Buildings - Precon

Precon’s Precast Concrete Building is an engineered, two piece structure that combines a safe, secure location to house expensive electrical, computer or automated equipment with a stylish exposed aggregate, maintenance-free exterior. The Precast Concrete Building can be insulated and several other accessories or options can be built in. When equipped with a heavy duty steel door is vandal resistant.


09-12-2011

Concrete Products - Precon

Our engineered products are produced under plant controlled conditions, enabling Precon to manufacture concrete structures of consistently high quality that are difficult to duplicate under field conditions. With the benefit of computer-aided design systems, Precon has the ability to produce detailed drawings to client's specification and minimize on-site problems. Precon's precast products are cost effective.


09-12-2011

900ø Catch Basin Material - Precon

Precon manufactures several Catch Basin pieces including tops, barrels and bases which accommodate most municipalities in Alberta. Precon’s Catch Basin material can be used in its standard form or can be stacked to accommodate unusual designs. 1070 high c/w 250 sump (Red Deer spec. 1070 high c/w 50 sump & weeper holes. 1070 high c/w no hole.


09-12-2011

Check Structures - Precon

The Check Structure allows the designer to control water levels and water velocity, which works well in conjunction with Precon’s Inlet/Turnout as a way to obtain necessary water levels for water delivery. Precon’s Check Structure is a multi piece precast concrete structure that assembles together in the shape of an ‘H’ and is installed in an irrigation canal perpendicular to the flow of water.