Owners of cottages and country houses know firsthand how important it is to equip storm sewers so that melt and rainwater do not spoil the finish and flood the foundation. But it’s not enough to organize the correct system for the disposal of effluents - without regular maintenance, it will quickly fail and “report” about it with drips on the walls and puddles near the house during a heavy rainfall or spring drop.
To avoid this, timely prophylaxis is required and the ability to quickly eliminate blockages. Therefore, let us consider in detail what methods the technology for cleaning storm sewers has, depending on the type of its design. Also in this article we focus on the causes of clogging of drainage systems and preventive measures.
Varieties of storm sewers
The purpose of storm storms is to collect water from precipitation and withdraw it to a special tank or just beyond the territory of the site via a pipeline network or by-pass gutters. Any design of a drainage system can cope with this task.
But in order to choose the most effective way to clean and prevent sewage blockages, you first need to find out which system protects your home from rain and thawed snow.
Open (surface) - the most budgetary and simplest design, which is equipped with country houses. It is a complex of trays, pipes, gutters, which are held on the roof and walls of the building, - a system of spillways. According to them, water enters the points of water intake - surface drainage ditches, equipped around the perimeter of the entire site or only at the adjacent territory, and is discharged into the ground.
Unconditional advantages of the open system: reasonable price of components, simple installation and easy cleaning. But with significant rainfall, it may not be able to cope with the flow of water.
Closed - the upper part of the stormwater drainage system still represents the same system of pipes and gutters, only the collected water is collected already in the underground sewer pipes, where other sewage from the house also flows, then to the collector and only after that it is diverted to the drainage system. In some cases, an additional pump is installed that controls the speed of the effluents.
Such a system perfectly copes with the removal of excess moisture from the site without flooding the soil, the formation of puddles and other flaws in the operation of open storms. Of the minuses, an expensive installation can be noted.
In addition, for the layman it can be an overwhelming task to make the correct calculation of the required number of components, the length and diameter of the pipes, determine the depth of their installation, the desired slope and other nuances. A detailed analysis of the design and calculation of storm sewer we presented in this article.
Closed and mixed systems provide for the separation of the shower structure into two parts: ground and underground. And the more often the upper elements are cleaned, the less is the likelihood of clogging of buried pipes
Therefore, for suburban cottages and country houses, designed for a longer period of stay than a couple of weekends in a year, most often install a mixed sewage system. In fact, this is a simplified version of a closed system
In this case, instead of a complex labyrinth of sewerage, water is diverted to a storage tank or septic tank located on the territory, settles, is cleaned, and then can be used for irrigation or other technical purposes.
Another option for the disposal of wastewater is withdrawal to nearby lakes and rivers, but for this the water must be filtered so as not to clog the pond (which is fraught with an impressive fine).
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Stormwater drainage spot cleaning
Causes of Storm Clogging
Linear Storm Drain Trap
Blind connection of a drain with a storm
Rotary wells of spot stormwater
Sand trap water inlets
Storm sewer collector cleaning
Technology for cleaning municipal storm sewers
Causes of clogged drainage systems
In any system, regardless of the type of its construction, various small litter regularly penetrates - the bones of fruit trees, insects, fallen twigs and leaves, bird feathers and nesting material.
All these "gifts of nature" are collected in the upper part of the drain and are gradually washed up in a dense cork. Moving into a storm sewer, it disables the operability of the entire drainage system
But there are other causes of blockages:
- Incorrect installation. If the required angle of inclination towards the catchment is not maintained in the pipeline (or is absent altogether), the water will stagnate and garbage will accumulate faster. You can verify compliance with the standards using the construction level (optimal indicator is 2-5 mm / linear meter).
- Curvilinear pipe laying. If the system has many sharp turns, blockages are inevitable. Therefore, when planning the pipeline, try to minimize bends. And it is not out of place with independent designing or accepting work from builders, it will be preliminary familiarized with SNiP 2.04.01-85.
- Heavy rainfall. After heavy rain, the system can be flooded with fine sand, silt or mud. It is difficult to prevent natural disasters, but it is recommended to check the system after them and arrange an unscheduled cleaning.
- House clogging. For closed systems in which storm sewage is combined by a pipe that discharges domestic wastewater, it is most often possible to solve the problem by cleaning the house pipe.
- Construction works. If the roof was blocked or the facade decoration was updated, upon completion of the repair it is necessary to check whether the wind brought foam gutters and pipes, fragments of plaster and other materials, which in the next rain turn into an impenetrable cork for water.
In some cases, the penetration of petroleum products into the system may also cause blockages. True, this phenomenon can be attributed to force majeure, which disable storm storms much less than the banal accumulation of leaves.
But if this happened, you should immediately call specialists who will establish the system and prevent soil and groundwater pollution.
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Manual gutter cleaning
Brush the drainage system
Gutter cleaning device
Flushing the gutter cleaner
Using garden hose in flushing
Device for purging and cleaning the system
Robot vacuum cleaner for gutters
Venting and cleaning the gutter
System Cleaning Methods
Depending on the design of the drainage structure and the type of its elements (the same gutters can be completely open or closed, but with nets or perforations), you can choose the most convenient way for you to care for the system.
Clean gutters are the key to quick water drainage and guarantee the smooth operation of the entire system, so be sure to check to see if leaves have accumulated in them and if the mud has lapped after rain
Consider all possible ways in more detail.
Method # 1 - mechanical using improvised means
The most affordable and popular method of cleaning, which is perfect for all open storm storms, is mechanical. It does not require any special equipment or special skills, except that caution when working at height. The essence of the work is the mechanical removal of accumulated debris.
Before starting cleaning, do not forget to protect your hands with tight gloves to protect yourself from sharp fragments and meeting insects
To complete this task, you will need some simple equipment: a ladder, a brush with bristles made of plastic or synthetic fibers, a spatula or a scoop, a garden hose with a water connection.
An excellent tool can be made with your own hands from an ordinary plastic bottle by cutting a semicircular hole in it along the diameter of the gutter. Just before cleaning, do not forget to protect your hands with tight gloves to protect yourself from sharp fragments and insects.
Cleaning should be performed from the highest point, covering all elements of the system:
- From the gutters laid on the roof, the accumulated debris must be scooped up and sent to a bag for further disposal. Just do not push the leaves and other rubbish into the drainpipes, it’s better to sweep everything out with a broom or brush, and then remove the house area.
- Funnels - connecting elements that combine gutters and rain pipes - are most often equipped with gratings that need to be removed and washed. If there is no such protection, you can simply clean the elements under the pressure of the water, removing traces of dirt and small rubbish, and large ones can be pre-assembled by hand.
- The drainpipes along which the drains flow down are the easiest to also rinse under good pressure, helping yourself with a brush. If you cannot reach the blockage with your hands and brush, and it does not lend itself to water, you can use a plumbing drill or cleaning tapes. Only such equipment must be used with care so as not to scratch the protective coating of the pipes, which leads to corrosion of the metal.
- Drainage channels must first be removed from the protective grilles (if installed), cleaned of debris and rinsed with water.
- Now inspect the sewage reservoir (ditch, drainage field), if necessary, remove the sludge and update the filter layer.
- It remains to return to place all the grilles and other elements of the system and check its operation using the same hose with a water pressure.
Specialized sectional, rod or drum type cleaning machines can facilitate manual labor, however, they are more designed to remove blockages in pipes, rather than cleaning open gutters.
But there is an option for those who do not want to collect leaves on their own - a robot vacuum cleaner.
Such devices can even cope with wet foliage, work in water and are equipped with a recognition system that helps determine how many passes will be required to completely clean the drain
Once this miracle of technology is installed on the roof, it will begin to move around the perimeter of the gutter system, removing dirt and debris from the brushes. It can work from an electric network or on batteries.
Method # 2 - washing under pressure of water
A closed or mixed system can also be mechanically cleaned in the upper (ground) part. True, you will have to carry out preliminary preparation - remove the nets or grilles from the gutters, arm yourself with a brush on a long stick or blower.
But to clean the underground drain, you may need hydraulic equipment. A simple garden hose is not enough here, since its pressure is not enough to break plugs of sand, dirt and wet leaves. Hydraulics provide a powerful water stream that perfectly flushes uncomplicated debris from the pipeline.
The choice of equipment largely depends on the design of the pipeline (straight, winding) and the diameter of the pipes, but in any case, you should first perform a mechanical cleaning of the ground elements of the stormwater so that the debris washed off under the pressure of water does not crumble somewhere on the way to the exit
And you can detect clogging through inspection wells or using video diagnostics - modern devices are equipped with a sensor and a cable, which, passing through the pipes, records or immediately transmits to the display an image that clearly demonstrates the state of the sewage system from the inside.
Typically, systems for cottages and small houses are equipped with elements with a diameter of 20-22 cm. For washing such a sewage, a household car wash with a capacity of 120-150 bar is enough.
But to clean the wide pipes that are equipped with large cottages, you will have to call specialists with professional hydraulic equipment, which is equipped with a long inlet hose and a powerful pump.
Hydrodynamic machines for cleaning stormwater and sewer systems are equipped with high-pressure pumps with a capacity of about 200 MPa, and special nozzles additionally increase the pressure and easily erode garbage deposits
Professional hydraulic machines also provide nozzles that can handle both simple and complex types of blockages:
- Universal - are used for ordinary washing of a drain and removal of soft garbage.
- Bottom - effectively remove leaves, pieces of polyethylene, soil, silt and other accumulations from stormwater.
- Punching - designed for crushing building debris, accumulation of leaves and branches, sand, paper.
- Rotary chain - Cope with old sediments and compacted debris that are not succumbed even to a strong pressure of water.
To use the hydrodynamic method of cleaning pipes, the site must have an uninterrupted supply of water and electricity. Otherwise, you will have to look for equipment that runs on gasoline, or call a car with a tank.
But such a technology, unlike other methods of cleaning the sewage system, absolutely guarantees the integrity of all drainage elements.
Method # 3 - thermal or steam cleaning
For mixed and gated systems combined with common sewerage, steam cleaning technology can be used. Here, blockages often occur due to fat growths on the walls of the pipeline, which are not amenable to cold water, but literally disappear before the eyes under the influence of hot steam. To do this, the water is heated to a temperature of 140 degrees and rinses the pipes.
But remember, the thermal method is recommended to be used as the final stage after mechanical and hydrodynamic cleaning. But it is not worth using it as an independent method - the risk of injuries is high, and the result is unpredictable.
Method # 4 - using chemicals
In cases where other cleaning technologies have proven powerless against complex clogging, resort to chemical reagents.
Such a need may arise if a large amount of fatty waste has entered the system that has stuck together in dense clods with the debris there, or if the design is so complicated and winding that the cork is technically inaccessible to the cable with punching nozzles, and water does not cope with the task.
The essence of chemical technology - soluble reagents are launched into the sewer, which break down accumulations of dense garbage and fat deposits into small particles, and then the pipes are washed under the pressure of water hydraulically.
Use these chemicals on their own with caution - most of them are toxic and can cause severe poisoning if they enter groundwater. Therefore, it is possible to clean the sewer using this method only with biochemical preparations, and even then, provided that the contaminated water first passes through filtration and does not get into drinking sources.
Methods for cleaning directly stormwater
Cleaning the direct storm sewer consists in periodically emptying the sand traps and removing plugs from the silt and sand from the channels of the underground system:
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Sand traps designed for equipping storm sewers are a sealed container with a basket inside. From above, both the device itself and the basket are covered by filtering nets
Sand traps are equipped with nozzles to which a pipeline is connected, transporting rainwater to the discharge point or collector, redirecting it outside the site
Sand traps for storm sewers with linear water inlets differ from point ones in configuration. They are installed on the branches of the system and at the points of association of several branches before discharge of water into the collector
The area of water collection in storm sewer systems with point storm water inlets is much smaller, because they only receive water collected from the roof. They are polluted less often than linear options.
Storm systems with linear water collectors take water not only from the roof, but also from the paved area adjacent to the house. They clog more often and more often require cleaning.
In addition to sand traps in linear and combined stormwater, it is necessary to clean the channels themselves that receive and transport water. To do this, simply remove the grill and clean the drain
A sand trap for the linear system installed in front of the manifold needs regular inspection and frequent cleaning.
Sand traps for systems with point, linear and combined storm water inlets are selected in accordance with the amount of rainfall they receive. The total volume of point species should be 1/3 more than the volume of water flowing from the roof of the water, linear - 1/3 more than the average rainfall per day in a particular region
Sand trap for storm sewers
Pipes for connecting underground utilities
Linear sand trap
The principle of operation of a storm storm with point storm water inlets
Clogged cast-iron grate above the drainage channel
Linear storm channel device
Connecting the collector pipe to the sand trap
Combined version of storm sewers
What is the danger of clogging the system?
If, having studied all the technologies for cleaning storm sewers, you are seriously thinking in the direction of "Do I need it," take a note and a list of problems that may result from a lack of care for the system.
- Stagnation of water masses in pipes and gutters creates an additional load on the fasteners. They may simply not sustain and bring down the system.
- The accumulated debris clogs the drains, and the water not only rinses the base of the house, but also penetrates through the ceilings and walls - yes, damp spots and moldy finishes can be a clear indication of a malfunction on the roof.
- Fallen fruits and berries create favorable conditions for the settlement of entire colonies of wasps, hornets, ants, and moss, mold, and even mushrooms can grow under moist leaves.
- In dry summers, trash on the roof may well cause a fire.
As you can see, regular cleaning of storms is not only a matter of comfortable housing in the house, but also your safety.
Blockage Prevention
Experts recommend checking the operation of open stormwater and removing accumulated litter at least 2 times a year. After the autumn leaf fall, you need to remove all the garbage in order to prepare the drainage system for winter, and in early spring to verify the integrity of the fastenings after frost and thaw.
But when tall trees grow at the building, you will have to look at the roof much more often if you do not want to know about the need for cleaning work from water flowing down the walls and roof of the house to bypass rain pipes. But if all the gutters in a closed type construction - just one inspection a year is enough.
Rain accumulators, sand traps, protective gratings for open gutters will help reduce the frequency and duration of care of storm sewers
The following preventative measures will help prevent the formation of blockages:
- Reducing the amount of debris entering the drainage system will help with special visors for funnels and fine-meshed nets / grids covering the gutters. If the system is already installed and there is no desire to upgrade part of its elements, you can fill the gutters with porous foam. It is applied by spraying, takes the form of a drain and does not allow large debris to pass into the pipes (although this protection needs to be updated every 3-5 years).
- Since the external stormwater system is much easier to clean than the underground one, it is possible to equip the drains with several grating traps that will stop soil particles, sand and leaves. To prevent blockage, it will be enough to regularly check the “control points” and remove garbage from them.
- If a closed or mixed type system is installed on your site, it is worthwhile to install household drains, grease traps in the pipes leading out of the house. This will help to avoid difficult to remove formations on the walls of the sewer.
- If the underground part of the system has complex turns, it is worthwhile to install manholes in potential clogging areas so that in case of problems you do not have to dig pipes.
In addition to additional system protection, it is worth taking care of wastewater treatment. To do this, it is necessary to equip sedimentation tanks with drainage fields or separators that mechanically separate water from sediment and other inclusions, or install an autonomous sewage system.
More about the organization of the drainage system on the site:
And this video details how to install a grid to protect the drain from leaves with your own hands:
Professional cleaning using hydrodynamic technology - how complex blockages are washed:
Compliance with building codes during installation, regular waste removal and prevention - three elephants for the smooth operation of the entire sewer system.
But if none of the popular cleaning technologies inspired you to labor exploits, you should agree with a cleaning company about the periodic cleaning of the storm. Believe me, such a service will cost much cheaper than eliminating clogged blockages and repairing a flooded house.
And what method do you use for cleaning stormwater? Do you take preventative measures to prevent the formation of blockages? Share with other users your secrets of caring for a common sewerage system - leave your comments and useful tips in the comments section.