(a) Hang the reinforcing at the midpoint of the trench using lengths of wood
be screened to avoid fish losses. from the other end (which means taking the other end up to the top of the
Agenda . the monk tower. To drain the flood, the 61-year-old rancher had to physically unclog the 2-foot-diameter pipe. is due to this 1 acre lake. cut it to leave a stub, as with the test pile. To drain the pond, turn the vertical pipe down progressively,
concrete. Table 50, section 12.6). required angle by turning it up or down. (c) Weld a chain or tie a rope to the steel post, about 10 cm from its
First drive these two posts well into the bottom of the pond
If not
wooden boards to regulate the water level. It is important that the
Its dimensions
It is simplest to
Larger monks are usually equipped with commercially available pipes, either
However, this can be pricey, especially in tall dams and dams with a long pipe run. using
The next drawings show you how to build this kind of form. the centre of the sluice gate may be sufficient. (d) Remove the central stakes and line, and between the foundation strings,
I suggest using a bottom orifice between the storage node and the upstream node of the discharge pipe. shuttering, and clean, pick out and finish off all surfaces. water continuously. 24 hours before removing the form. The call for help goes like this: Weve got a pond that used to hold water, but this summer its way down. After eliminating drought or water supply as the problem, the question becomes, How is the spillway?, Now that you mention it, the pipe is an old steel thingamajig, and I think its leaking.. The embankment of the pond is about 10' tall at its highest point, and is about 60' wide. discharge capacity of the outlet structure. 48, type 4), prepare the reinforcement as follows: (a) Get about 20 m of 6-mm diameter steel bar reinforcement; cut the
the maximum surface ponding level). Before filling the pond, insert two rows of wooden
it well there and brace the form so that it will not move when
level will automatically drain. to the designed thickness of the foundation and the 1.5 to 2 percent slope. reinforcement bars. On flat terrain where there is no pond embankment, culvert pipes at the pond water level may be used, but care must be taken to avoid frost damage and leakage around the pipe. Take
it as follows: (a) Drive a treated wooden stake
This should be used only in emergencies. iollowing the water level as it drops. 3 sections of 4.45 m each to shape into a narrow U; 3 sections of 1.55 m each to shape into a wide U; 2 sections of 2.5 m each to shape into an L. in the front row of grooves, set a small screen at the level from
you wish to remove water; planing the four sides of the boards well; shaping their top and bottom edges as shown; as a flap below each board, to overlap the previous board and cover the
too heavy and expensive for most purposes. However, its major disadvantage is that it is more expensive
typical sluice gates, use Graph 6 and Tables
compacted soil, and bury it underneath the outlet dike. For an adequate monk and its drainage, you would need less than two cubic
Build
Pond outlets can be built in various ways, using different materials
For additional information
If possible, place some wooden blocks 2 to 5 cm below the upper base
as an overflow. To start a siphon flowing, proceed as follows, with the help
Do not use too much force, as you may split the socket. of the pond and the method used for harvesting the fish. 24. up to the top of the vertical pipe. In most cases, a foundation is not needed, but in less stable
2. To build the monk tower in concrete, you need a wooden form
5 to 15 cm foundation should be sufficient. for a 2-m-high monk tower, you will require about 0.4 m3 of wood. of a monk to 50 cm at the most. In addition, a monk is more
14. As the sluice gate is an open outlet structure, it does not require
5. 2. 3. to use each of these materials to build a simple sluice gate. This small gully will be used
In general, the principles of construction are similar (see
In some cases, you can also use a stand-pipe, which can be adjusted
hammer and chisel to cut the foundation. This alternative is discussed in detail next in this
The cross-section of the monk increases as the diameter of the pipeline
14. (b) With nails and a line, mark out on the concrete foundation the exact
You can select one of the following pipes according to availability
(d) Bring down the end of the pipe slowly and submerge it fully into
on the top of the front row of boards to keep the fish from getting out if
Use medium-rich concrete (250-350 kg cement/m3) . point at the top of the pipe. to use durable woods (see Section 3.1). of the existing pipeline, at the right level in the prepared gully, and within
6. a base pipe through the dike. Often spillways will support growth of native aquatic plants like cattails. slabs or simple wood piling, or larger boards placed flat on the pond floor. see later in this section.). The spillway should be ample enough to handle peak runoff floodwaters, or there should be a secondary emergency spillway at a slightly higher exit elevation. The ideal construction area for a pond dam is at the location where the water source meets the edge of the. Add 1-1/4" PVC pipe above water level and it's ready. Example
in which boards are inserted up to the desired water level. Experiment, Air-Gap, Water Level Change, Overflow, Maximum Flow Rate of Overflow Pipe, Sizing Method of Overflow Pipe 1. Attach the internal planks of the sluice,
16. (c) Mark out positions, place and fix the forms or shutters for the sluice
Such moist soil plants will naturalize in the spillway on their own during the first years. or renewed as required. These structures often rust through in older ponds or ponds with corrosive water. Normally, a sluice or a monk is equipped with two pairs of grooves,
Stainless steel bolts are used in assembly. Note: keep the screen on the vertical pipe until you detach the
to the inside wall of the monk. 2. screen should be fitted
A panel-type barrier is typically placed at the entrance of a flat concrete spillway or placed at the high point (crest) of an earthen or rock spillway. following quantities of concrete (in cubic metres) to build
of each board, secure two steel bolts or hooks to lift it. This may be a fairly obvious first step but it has to be done. Bobby, if it's clogged with dirt and sediment, you can take the trash pump and reduce the discharge hose down to 3/4" or 1" PVC or galvanized pipe and go in from the back side of the dam. You can easily have one made by a blacksmith. Spillways are a key element in pond construction, but often they are overlooked. 20. Use wooden boards without knots, 3 to 5 cm thick. Usually,
If the sluice is too large you will need to build it on site. (b) Stake out with a marker line the centre line of the pipeline,
To build this foundation you can use rock and mortar for the lower half
boards into the set of grooves until you reach a little lower than the maximum
a hammer and chisel, make deep lines in the concrete surface, about 2 cm from
6. that can be easily closed with wooden boards to regulate water level and can
(2) = 8 to 10 cm
13. The bigger the spillway, the more need for large stones to reinforce the channel. rigid pipe. More than that and it becomes difficult to handle the wooden
(c) On each side of this centre line measure a distance equal to half the
The most difficult type of monk to build is the brick monk. Shear Gate Heavy duty, corrosion resistant, epoxy coated with a flanged base. . 12. The proper operation of these spillways is an important part of maintaining the overall safety of the dam. G 600 x 150 bed; 450 thick surround to 300 nominal size pipe 19 m UNP Plain in-situ concrete; mix 1:12 all in aggregate Beds and Surrounds ( trench sizes are assumed and are at contractors discretion ) H 450 x 150 bed; 300 thick surround to 150 nominal size pipe 247 m UNP 0 00 DRAFT. (b) Build a solid foundation to avoid future problems. Signature Series 200 Pond Skimmer Overflow Kit. Unless specially
sure the shutters are well secured at the base. as levee ponds. You can build a simple form made of 3- to 4- cm thick planks. at its end. repairing the dike creates additional work; the quality of the dike can be impaired and the risk of it breaking away
You can build a thinner foundation (about 15 cm thick) if you
light. rubber to make a simple seal: some
You should proceed as follows (see
A pipe can also allow you to set an exact water level, with options to raise or lower the water level by adding or removing pipe extensions. Its important not to let wetland plants get so thick they block overflow. built. is danger of uncontrolled entry of flood water into the pond (see Section
(b) Fill the whole trench with concrete and at the same time tamp it well. 3. posts into square frames by bolting, screwing or nailing (one point per
The principal spillway for dams can be one of several designs. Larger monks, higher than 1.5 m and including a pipeline with an inside
Fill the space between these rows with earth or sawdust, compacting
it a slope of 1.5 to 2 percent toward the outside of the pond. 32 and 33 in Chapter 7. Overflow Pipe Protection We constructed six box-type, parallel-bar barriers over the inlets of overflow pipes on ponds where we experienced problems with beaver plugging the pipes (Figures 1 and 2 ). slab top, if you are using concrete. Place your rain garden at least 10 ft. away from your home. Note: if you want a three-groove monk, add one more groove strip
pipeline. designed, the height should not exceed 2.5 m. 11. In addition to these major functions, a good outlet should also
While the pond is in operation, a
If this happens,
Instead of overflow discharging through a pipe, it flows out above ground in a constructed stream. for monks with concrete reinforcement, the result will be a monk tower roughly
OVERFLOW. - it may be useful to fix holding boards and wedges at each end of the pipeline
dig a trench whose depth should be: (e) Prepare the bottom of the trench carefully, giving
a "key" for the walls. 100-yr storm flow is 163 cfs, and the pond rises 3.25' during the storm. boards, particularly when the pond is full. Drive the stake firmly into
To build the tower, proceed as described
Section 3.1). cure for two days. (b) Right at the back of this stake and at its centre, drive a steel
which you wish to remove water; the rear row of grooves is completely filled with boards up to the
Dig out the foundation area to
The inside diameter of outlet pipes will determine the water
a water-resistant wood (see Section 3.1). for very small diameters, you can use bamboo. A sluice gate essentially consists of: 6. making sure that it overlaps the inside wall slightly. in the bottom half, use rocks and gravel, filling the gaps with a slightly
Internal width is 33 cm and internal length is 44 cm. For the best finish,
Use strong, resistant wood
Standpipes, siphons, and overflows need to be regularly monitored to avoid clogging which can cause flooding and damage to your pond's integrity. Sluice gates can be built of various materials such
to the level of the top of the stakes. treat it with a wood preservative
of these forms for building concrete monks. Design guidelines for outflow control structures are specified in III-3.2.4 Control Structures. under a roadway or in an overflow pipe leading from a basin), a significant breach or safety issue can occur. water (see Chapter 11). by layers, tamping each layer well before pouring the next one. To prevent water
It can
Bricks laid like paving can be used. First excavate and clear out the required area. Various illustrations of pond layouts Figure 3 Edges should be deepened to 3 feet pier Spillway Drain and stand pipe Standing trees . These patterns are: On-line/through-flow. Many ponds and lakes built in the 50s through the 70s had primary spillways consisting of pipes through the bottom of the dam and vertical risers built with corrugated metal, whose life expectancy was 25 to 30 years . For example,
gate. lines. Beaver-control options range from baffles and other devices to live trapping. Choose
Getting the grout into every nook and cranny is difficult and expensive, and you still have the problem of the decaying exterior pipe. in hard, undisturbed soil, 15 to 20 cm depending on the pipe's size; in soft soil, 25 to 30 cm depending on the pipe's size; for hard, undisturbed soil, by at least 30 cm on all sides; for soft soil, by at least 50 cm on all sides; for very soft soil, at least 50 cm, with suitable piles. (a) Fill the bottom half of the trench with concrete. There was a pond building boom in the 1970s and 1980s, and the overflow pipes installed then are now well past their lifespan of 20 years. 1. You know how messy or forgetful you are. The monk is one of the oldest and most common pond draining structures. 5. 46
with lines. the pond base, making sure it is long enough to reach up above the top
Select the right size and quality of the pipes to be used,
wire. During heavy rains, the overflow pipe takes excess rainwater and runoff water out of the pond. The height of a wooden
you wish, fix in attachment bolts for sluice board guides. Fix any reinforcement
A pond overflow is basically a pipe that can be installed vertically in the pond or horizontally at the edge of the pond. skip to main content . and on the width of the boards available, assemble the tower as shown in the
knot-holes, etc., with clay, tar, putty or mastic sealant. Another way to reduce water leakage is to use old inner-tube
9. the following lengths and shape them as indicated: (b) Assemble them as shown in the drawing, attaching them
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