The Complete Guide to Infrastructure Networks for Sewer, Fire, Irrigation and Stormwater

What infrastructure networks are and why they deserve attention

Infrastructure networks are the lines, pipes and manholes that run beneath a project and serve the whole site. They carry wastewater away from the buildings, deliver irrigation water to lawns and planting, stand ready to fight fire and drain rainwater before it collects in streets and courtyards.

Most people notice buildings and facades and rarely think about what lies under the ground. Yet any fault in a network shows up later as odours, standing water, weak pressure or sinking pavements. Repairing a line after it has been backfilled and paved is far harder than building it correctly from the start.

Who these works are for

• New residential plots and subdivisions that need complete networks before construction begins.
• Residential and commercial compounds serving a large number of units.
• Palaces and large villas with wide grounds and extensive gardens.
• Commercial and service projects that need an independent fire network and a separate stormwater network.

In every one of these cases the story begins with the drawings. The design sets the route of each line, its diameter, its levels and the pipe material. The contractor's role is to turn that paper into a real network that works exactly as it was designed.

Why networks need special care

Buildings can have their finishes changed or their facades renewed with relative ease. A network, on the other hand, disappears beneath roads, pavements and gardens. Any change to it means digging, breaking and rebuilding whatever sits on top. That is why getting it right the first time saves the owner money and trouble.

A good network never draws attention to itself. It simply works quietly in the background, day after day and season after season. That is exactly what you should expect from every underground system in your project, and it is the standard this guide is written around. The sections that follow walk through the network types, pipe materials, manholes, testing, site conditions, the supporting components of each system and the documents you should receive at handover.

The main network types and what each one does

Each network has a different function and a different way of working, so it is a mistake to treat every line the same way. A simple understanding of these differences helps you follow the work on site and ask the right questions at the right time.

Sewer network

The sewer network usually works by gravity. Wastewater flows because of the slope of the pipe, not because it is pushed by pressure. The most important thing in this network is therefore accurate levels and gradients from one manhole to the next. Any error in the slope causes sediment to build up and leads to repeated blockages that are difficult to clear once the line is buried.

Fire network

The fire network is a pressurised system that must stay ready at all times. It needs pipes and joints that can withstand pressure, and isolation valves placed in carefully chosen locations. Above all, it must be pressure tested before backfilling so you can be certain it does not leak.

Irrigation network

The irrigation network delivers water to gardens, central medians and green areas. It also works under pressure and needs a balanced distribution so that water reaches the farthest point with the same strength as the nearest one. Poor balance leaves some areas overwatered and others dry.

Stormwater network

The stormwater network collects rain and flash flood water from streets and open areas through drainage inlets and carries it away from the site. It may stay dry for long periods and then suddenly receive a large volume of water. For that reason it needs suitable diameters, clean inlets and correct gradients so that it performs the moment it is needed.

One team for all networks

When a single team builds all of these networks, coordinating their routes becomes much easier and lines do not end up crossing one another at random. The same people understand where every pipe runs, how deep it sits and which one must be laid first. That shared knowledge prevents clashes on site and keeps the responsibility for the final result in one place.

Coordinating network routes before excavation

In a single project, several networks may run under the same street or open area. Sewer, stormwater, fire and irrigation lines share the ground with power cables, telecom cables and water supply lines. If each network is built on its own without coordination, the lines start crossing at random. Every unplanned crossing may mean changing a level or breaking a line that has already been laid.

Why coordination starts on paper

A clash between two lines on a drawing is fixed with a pencil. A clash on site is fixed with digging, breaking and rework. That is why all the drawings should be reviewed together before work starts. Cross sections of the streets are prepared to show the position and depth of each line, crossing points are identified, and each line is checked to pass above or below the other with enough clearance.

General rules for arranging the lines

• Sewer lines are usually the deepest because they work by gravity and need steady gradients.
• Water and fire lines are kept away from sewer lines and pass above them at crossings so they are not contaminated if a leak ever occurs.
• Stormwater lines follow a route that matches the road gradients and the collection points.
• Irrigation lines sit closer to the surface and follow the locations of trees and lawns.
• Cables need a separation distance from water lines and are protected in their own way.

The order of work on site

A useful rule is to start with the deepest line and then move to the shallower ones. This way nobody digs beneath a line that has already been laid and puts it at risk. Neighbouring lines are built at the same time whenever possible, so the ground is excavated once and backfilled once.

Questions worth asking

• Were all the drawings reviewed together, or each network separately.
• Are there street cross sections showing the order of the lines.
• How will any crossing that does not appear on the drawings be handled.

This coordination is the greatest benefit of having every network built by one team. A team that knows the route of each line can organise the whole job so that no line damages another. On projects that call for deep excavation, the excavation itself needs the same level of planning, with stable trench sides and a clear sequence agreed before the first machine arrives.

Pipe types and where each one is used

Choosing the pipe material is not a cosmetic decision. Each type has places where it performs well and conditions it can tolerate. In most projects the designer specifies the material in the drawings, and the contractor is responsible for supplying the matching product and installing it correctly.

What shapes the choice

Soil type, groundwater level and the loads above the line all influence which pipe is suitable. A line running beneath a street with truck traffic, for example, is a very different case from an irrigation line inside a garden. The deeper the line and the heavier the traffic above it, the more the pipe and its surrounding layers have to carry. Aggressive or salty soils push the decision toward materials that resist corrosion, while rocky ground puts more weight on the bedding than on the pipe itself.

Quality of supply and storage

What matters most is that pipes and fittings come from a known source and match the specification written in the drawings. Substituting a cheaper or unverified product to save time often creates the very problems the design was meant to avoid. Pipes must also be stored on site in a way that protects them from direct sun and from breakage before installation. Plastic pipes left in strong sun can lose their shape, and stacked pipes that are dropped or dragged can crack at the ends, which then shows up as a leaking joint during testing.

Ask your contractor to name the pipe type, diameter and source for each network in the quotation, and to show you the delivered material before it is laid in the trench.

Bedding and surround around the pipes

A pipe does not live alone underground. It rests on a bedding layer, is surrounded by a protective layer, and then the backfill comes on top. These layers decide whether the pipe stays straight and intact or bends and cracks over time. Many network failures are not in the pipe itself but in what surrounds it.

What the bedding does

The bedding is a layer of fine, uniform material placed at the bottom of the trench. Its job is to spread the weight of the pipe and everything above it over a wide area, to stop sharp stones from pressing on a single point, and to provide a surface on which the gradient can be set accurately.

What the side and top surround does

After the pipe is laid, fine material is placed along both sides and compacted with care. This side support is especially important for plastic pipes, because they rely on the soil around them to hold their round shape. A layer is then placed above the pipe to protect it from the first lift of ordinary backfill.

Mistakes that keep repeating

• Laying the pipe directly on a rocky trench floor without bedding.
• Compacting one side only, which pushes the pipe off its line.
• Dumping general backfill over the pipe with an excavator without a protective layer.
• Using sand mixed with clay or debris instead of clean material.

At the joints

Some joint types are wider than the body of the pipe. In that case a small recess is dug into the bedding beneath the joint so that the pipe rests along its full length rather than on the joints alone. This small detail prevents pressure points that could crack the joint later.

Bedding and surround never appear in the final photographs of a finished site. That is exactly why photographs of them taken during the work are among the most important records you should ask for. They are the only proof that the hidden layers were built as the drawings require.

Manholes and inspection chambers

A manhole is the access point to the network. Through it the lines are inspected, cleaned and maintained throughout the life of the project. It is therefore a core part of the network and not a side addition that can be built quickly at the end.

Manholes are usually placed where a line changes direction, where the diameter or level changes, and where lines meet. Each manhole needs a stable base, solid walls and an internal channel, known as benching, that guides the flow smoothly instead of letting water and solids collect at the bottom.

What makes a good manhole

• Inlet and outlet pipe levels that match the drawings exactly.
• Tight connections between the pipes and the manhole wall that let neither water leak out nor soil seep in.
• Suitable protection for the inner walls, especially on sewer lines where gases can attack the concrete.
• A cover rated for the traffic above it, whether pedestrians, cars or trucks.
• A cover level that matches the finished road or pavement so it neither sticks up nor sinks.

Why manholes cause so many problems

Many network problems begin with a manhole built in a hurry. A wrong inlet level creates a step that traps solids. A weak wall connection lets groundwater and fine soil enter the system. A cover set before the final paving level is known ends up either too high, where it becomes a trip hazard and is struck by vehicles, or too low, where water collects around it. Each of these faults is small on the day it happens and costly to correct once the area has been paved.

How the work is checked

At YAMIC we follow each manhole with measurements and photographs and connect it to the network only after its levels have been confirmed. The base, walls, benching and pipe connections are checked before backfilling around the chamber, and the cover level is set in coordination with whoever builds the final surface. This approach keeps the manholes doing their real job, which is to give easy access to the network for its whole working life.

When you review a quotation, check that the manholes are listed by type and depth, with their covers and protective linings, rather than appearing as a single unexplained figure.

Property connections and linking buildings to the network

The main network in the street is not enough on its own. Every building needs a connection that links it to that network. In residential subdivisions and compounds there are many of these connections, and the connection point is one of the places where problems most often appear when the work is rushed.

The sewer connection from building to network

The connection starts at the last inspection chamber inside the property boundary and runs at a suitable gradient until it reaches the manhole or the main line. The level where it leaves the building must be sufficiently higher than the level where it enters the network. If the building sits lower than the street, it needs a different solution, such as a collection chamber with a pump.

Inspection chambers inside the property

• A chamber where the line leaves the building, so it can be cleaned without working in the street.
• Chambers at every change of direction inside the courtyard.
• Covers suited to their location, whether in a driveway or a garden.
• Cover levels that match the finished tiling.

Water, irrigation and fire connections

Pressurised connections need a valve at the connection point that allows the building to be isolated without shutting down the whole network. This valve sits in a small, easily reached chamber. The connection also needs protection where it crosses beneath a pavement or a vehicle entrance.

Keeping rainwater out of the sewer

A common mistake is connecting roof downpipes or courtyard drains to the sewer line. In heavy rain the line fills up and overflows from the inspection chambers. The correct approach is to send rainwater to the stormwater network or to a separate drainage solution, according to the project design.

What to check at handover

• Testing of the connection itself, not only the main line.
• Photographs of the connection point at the manhole before backfilling.
• Confirmation that every unit is linked to the correct line.
• The location and level of every connection recorded on the final drawings.

In large compounds the combined length of all the connections can exceed the length of the main line itself. They therefore deserve the same care, the same testing and the same documentation as the main network.

Components of the external fire network

An external fire network stays idle for most of its life, yet it must work immediately and at full strength the moment it is needed. Every component in it has a specific job, and none of them should be dropped or simplified.

Main components

Why a ring main

A ring main runs around the project and returns to its starting point. If one part is closed for maintenance, water still arrives from the other direction. This layout makes the network more reliable. The contractor's role is to build the complete ring and place the valves in their correct positions so the system works as designed.

Thrust blocks are not optional

When pressurised water passes through a bend or a branch, it pushes the pipe in a particular direction. Without a concrete block to anchor it, the joint may separate over time. These blocks are cast before the pressure test and left to gain strength. Rushing the test before they have set can move the line.

Protecting hydrants and valves

• Place hydrants where vehicles will not strike them, or protect them with bollards.
• Set their height after the final pavement level is known.
• Mark valve chambers and their covers so they are easy to find.
• Install signs or markers showing the line direction and valve locations.

Regional considerations

In coastal areas such as Jeddah and Dammam, exposed metal parts need stronger protection against corrosion because of humidity and salt. In the southern highlands, attention is given to the depth of the lines and any exposed parts during the colder months. In every case, the fire network is a safety system before it is a pipe network, and it should be planned and built with that in mind.

Irrigation network components and how water is distributed

An irrigation network looks simple because it sits close to the surface and its diameters are usually small. Its success, however, depends on a smart distribution of pressure and water. A network that floods part of the garden while leaving another part thirsty is a network whose distribution was not worked out properly.

Main components

• The water source, whether a ground tank with a pump or a direct supply connection.
• Filters that stop sand and impurities from clogging drippers and sprinklers.
• The main line that carries water to the different areas of the garden.
• Zone valves that open and close each area separately.
• Branch lines, drippers and sprinklers chosen to suit each type of planting.
• A controller that sets the operating times for each zone.

Dividing the garden into zones

A lawn needs a different watering method from trees and shrubs, and an area in full sun all day differs from a shaded one. The network is therefore divided into zones, each with its own valve. This allows every area to be watered according to its needs and reduces wasted water.

Valve boxes

Zone valves are housed in special underground boxes. These boxes make maintenance access easy and protect the valves from dirt and foot traffic. They should sit in known locations recorded on the drawings, so nobody has to dig around looking for them later.

Irrigation and climate

In Riyadh and Qassim, evaporation rises sharply in summer, so watering early in the morning or late in the day is preferred, and spraying is reduced when it is windy. In coastal cities the filters may need more attention if the water carries salts. In the southern highlands, irrigation programmes are reduced during the rainy season.

Irrigation is closely tied to the design of the garden itself. If you are planning complete outdoor works, take a look at our landscaping service so that the planting and the irrigation are designed together from the start.

Stormwater drainage elements on site

Rainfall in Saudi Arabia has a character of its own. Long dry spells can be followed by heavy rain over a short time. This means the stormwater network must always be ready even though it rarely works. Any neglect in its elements shows up in the first heavy downpour.

From the surface to the pipe

The journey of rainwater begins on the ground surface. Roads, courtyards and car parks must be graded so that water flows toward the collection points. If the surface falls are wrong, the water will never reach the network, however good the network is. The finished surface levels and the inlet locations must therefore be coordinated before construction.

Common elements

• Drainage inlets along road edges and car parks, with grates that keep out large debris.
• Catch basins that receive water from the inlets and leave room for sand to settle.
• Grated linear channels in open areas and wide entrances.
• Conveyance lines leading to the final discharge point.
• Soakaway pits on sites that are not linked to a wider network and where the soil allows it.

Sand is the enemy of the network

In the central and northern regions, wind carries sand and drops it into inlets and channels. With the first rain, that sand is washed into the lines and settles there. Catch basins are therefore designed with a sump slightly deeper than the outlet pipe, so the sand settles in the basin instead of entering the line. Cleaning them regularly before the rainy season keeps the network healthy.

Protecting buildings from rainwater

• Falls away from buildings in every courtyard and walkway.
• Roof downpipes never directed straight at the building foundations.
• Building entrances set higher than the surrounding open areas.
• Inlets kept away from spots where leaves gather heavily, unless fitted with suitable grates.

In highlands and on slopes

In Abha, Al Baha and Taif, water may arrive from outside the site itself, running off the mountain or the higher neighbouring land. Draining the site's own water is not enough here. Water coming from outside must be intercepted with channels or barriers and diverted away from the buildings. This is part of studying the site before the design is finalised.

A good stormwater network needs nothing more than regular cleaning. A weak one needs repairs after every season, and those repairs usually mean breaking surfaces that were finished only recently.

Lift stations and holding chambers when gravity is not enough

Sewer networks are meant to work by gravity, but some sites do not allow it. A building or part of a project may sit lower than the line it must discharge into. Or the run may be so long that the line would become very deep if it kept falling at its gradient. In these cases lift stations and holding chambers come into play.

When you need a lift station

• A basement with bathrooms or drains below the level of the network.
• A site lower than the street where the main network runs.
• A large project where a gravity line would become impractically deep.
• Rainwater collecting at a low point that cannot drain by gravity.

Components of a lift station

A lift station is a small underground tank into which water flows by gravity. It contains one or more pumps that start automatically when the water reaches a set level, then push the water through a pressurised rising main to the nearest point in the gravity network. There is usually a standby pump that takes over if the first one stops, and an alarm that warns when the water rises above its normal level.

What matters in construction

• A watertight concrete chamber lined inside against corrosion and gases.
• A wide opening that allows the pumps to be lifted out for maintenance.
• Non return valves on the rising mains so water does not flow back into the chamber.
• Proper ventilation of the chamber on sewer lines.
• A safe power supply and a control panel in a dry, raised location.

Alternatives worth comparing

Before committing to a lift station, the alternatives deserve a proper look. Can the line route or the building level be adjusted. Can only part of the drainage be pumped instead of all of it. A pump is a mechanical component that needs power and maintenance, so a gravity solution, where it is possible, remains simpler to operate.

Maintenance after commissioning

A lift station needs more attention than the rest of the network. The floor must be cleared of sediment, the pumps checked, the alarm tested and the standby pump confirmed to work. It is important that the owner receives a simple operating guide that explains what to do when the alarm goes off.

Lift stations are usually built alongside other underground concrete structures such as tanks. You can learn more about this type of structure through our concrete tanks service.

Testing before backfilling

Testing is the moment a network proves it is sound. After backfilling, finding any leak becomes costly and exhausting. Our rule is therefore simple and clear. No line is backfilled before it has been tested.

Pressure testing

Pressure testing is used on pressurised networks such as fire and irrigation. The line is filled with water, the pressure is raised to the test value set in the specification, and the reading is monitored throughout the test period. A steady reading means the joints and welds are tight. A falling reading means there is a weak point that must be found and fixed while the trench is still open, and the test is then repeated.

Leak testing

Leak testing is used on sewer and stormwater networks that work by gravity. Both ends of the section are sealed, the section is filled with water and the water level is watched. In some cases air is used instead of water, depending on what the specification requires. Either way, the aim is the same, to prove that the pipes, joints and manhole connections hold without loss.

Other important checks

• Confirming gradients and levels with a survey before backfilling.
• Checking that the line is straight and that the pipes are clean inside.
• Testing the compaction of backfill layers in stages, not only at the end.

Why staged checks matter

Each check protects a different part of the work. The survey confirms that gravity lines will actually flow. The internal inspection confirms that no debris, stones or soil were left in the pipes. Compaction checks on each layer prevent settlement that would later crack paving or tilt manhole covers. Leaving all of these until the end hides problems under layers that then have to be removed.

Your right to written results

You are entitled to ask for written test results for every section. These records are an important reference for you at handover and for any future maintenance. Each result should name the section it belongs to, the type of test and the outcome, so it can be matched to the final drawings. A general statement that the network was tested is not enough, because it does not tell you which part was checked or how.

How climate and soil type affect the network

Saudi Arabia is a large country, and conditions change from one region to another. A successful network is one that respects the nature of the site and not only the drawings. The same design can behave very differently in rocky ground in the centre, in wet ground on the coast and on sloping land in the south.

Central region

In Riyadh, Al Kharj and Qassim the climate is hot and dry, and the soil may be rocky on some sites and sandy on others. High temperatures affect plastic pipes if they are left in the sun for a long time before installation. Rocky ground needs a good sand bedding beneath and around the pipe so that it is not exposed to pressure points from sharp stone. Sandy ground, on the other hand, needs care with trench stability and with compaction of the backfill so that the surface does not settle later.

Coastal regions

In Jeddah, Dammam, Al Khobar, Jubail and Jazan humidity is higher and the groundwater level may be close to the surface. Excavation here needs dewatering and support for the trench sides. Salty soil demands extra care in protecting concrete and steel pipes from corrosion, and the choice of pipe material and manhole lining often reflects this. Work sequencing also matters, because an open trench in high groundwater must be laid, tested and backfilled in an organised way.

Southern highlands

In Abha, Khamis Mushait and Al Baha the land is stepped and rainfall is heavier in its season. Stormwater networks carry special importance here. The natural slope of the land may help or complicate the design depending on its direction. The cold in some months also calls for attention to the depth of pressurised lines and to any exposed sections.

Starting from the site

This is why Yam Integrated Construction begins every project with a site visit and a study of the soil before the excavation and pipe laying methods are agreed. The visit shows the real ground conditions, nearby existing services, access for equipment and any water that may enter the site from outside. Those observations shape the trench method, the bedding, the protection of materials and the order of the work, so the network is built for the place where it will actually live.

How to read network drawings without being an engineer

To a project owner, network drawings can look like a tangle of lines and symbols. Understanding the basics helps a great deal. You can follow the work, make sense of the quotation and ask about any change on site. You do not need to know every engineering detail to benefit from them.

The plan view

The plan view shows the site from above. It displays the routes of the lines, with a different colour or symbol for each network. Manholes appear as circles or squares carrying names or reference numbers. Next to each line you will find its diameter, its material and, for gravity networks, the direction of flow.

The longitudinal profile

The longitudinal profile shows the line from the side, and it is the most important drawing for sewer and stormwater networks. It gives the ground level above the line, the invert level of the pipe at each manhole and the gradient between each pair of manholes. From this profile you can tell how deep the excavation is at every point. That is why it is directly linked to the quantities and to the way the trench will be supported.

Standard details

Standard details are enlarged drawings that explain how a specific element is built. Examples include the trench section with its bedding and backfill layers, the manhole with its walls and cover, or the thrust block in a fire network. These details are the reference point for any discussion about how the work should be done.

What to look for yourself

• Does each network have a clear colour or symbol, with a legend that explains it.
• Are the diameter and material written on the lines.
• Are there longitudinal profiles for the sewer and stormwater lines.
• Do the manholes have a schedule showing their levels.
• Is there a detail for the trench section and backfill layers.

When the site differs from the drawings

Sometimes the site reveals something that was not on the drawings, such as an existing line, rock or a ground level that differs from the survey. In that situation the contractor does not change the route on his own. He reports the observation, proposes a solution, has the change approved and then records it on the final drawings. Understanding your own drawings makes you part of that decision rather than someone who hears about it after the trench has been filled.

Protecting the network from the works that follow

The network is completed and backfilled, but the site does not stop there. Paving, asphalt, planting and boundary walls follow, and perhaps extensions some time later. Each of these works may come close to a buried line, so the network needs protection that stays with it for its whole life.

Warning tape

Warning tape is a coloured strip laid in the backfill some distance above the pipe. If anyone digs in the future, the tape appears before they reach the line. Each network type has a recognised colour that makes identification easy. Some tapes contain a metal wire that allows the route of plastic lines to be traced with detection equipment.

Protection under roads and entrances

A line crossing beneath a road or a vehicle entrance carries heavier loads. It may need extra protection, such as concrete encasement or a larger sleeve pipe through which the line passes. A sleeve has another benefit, because it allows the line to be pulled out and replaced later without breaking the road.

Trees and roots

The roots of some trees seek moisture and grow toward pipes. Over time they can enter the joints, block them or break them. The design should therefore keep large trees away from sewer lines and choose suitable planting near the lines. Where the distance is short, root barriers can be used.

Markers on the surface

• Small plates or markers on pavements showing the route of the main lines.
• Manhole covers marked according to the network type.
• Clear markers for fire and irrigation valve locations.

Coordinating with the paving contractor

If the paving or asphalt work is done by another party, that contractor must receive the network drawings before starting. That way they know where the manholes are, set the covers to the finished surface level and never bury a cover under asphalt. This is one of the problems that keeps recurring when the parties on a site work separately from one another.

As built drawings and the handover file

After backfilling and paving, all that remains visible of the network is the manhole covers and a few valves. Everything else is underground. On the day you need maintenance or a modification, you will have nothing in front of you except what was documented. That is why the handover file is part of the network itself.

What as built drawings are

As built drawings are drawings revised after construction to match what was actually done on site. The site may force small changes to a route or a level during the work, and the design drawings do not reflect them. The as built drawings show the location and true level of every line, and the position of every manhole, valve and connection.

Contents of a good handover file

• As built drawings for each network with the actual levels.
• A manhole schedule with cover level, invert level and pipe inlet and outlet levels.
• Pressure and leak test results for each section, with their dates.
• Backfill compaction test results.
• Photographs of each stage before backfilling, organised by section.
• Data on supplied materials, such as pipe type and source.
• Operating and maintenance guides for pumps and controllers, where they exist.
• The written warranty and what it covers.

The handover walk

Before signing for acceptance, the network deserves a walk around the site. A sample of manholes is opened to confirm they are clean and free of sediment or debris. Valves are opened and closed. The irrigation system is run zone by zone. The cover locations are matched against the as built drawings.

Who keeps the file

Keep a paper copy and a digital copy in a safe place. If the project has a management or maintenance team, give them a copy as well. When the property is sold or leased to an operator, this file becomes one of the most important things handed over with it.

Signs of an incomplete file

• Design drawings only, with no revisions after construction.
• General test results that do not name the sections.
• A few photographs that do not show where on site they were taken.

At YAMIC we gather these records as the work progresses rather than at the end. Photographs and test results reach you at each stage, and at handover the file is ready and organised together with the written warranty documented in the contract.

Operating and maintaining networks after handover

A well built network lasts a long time, but it is not a network without maintenance. Every network needs simple, regular attention that stops a small issue from turning into a major failure. Preventive maintenance is always easier and less disruptive than repairs after a breakdown.

A simple maintenance programme for each network

Signs that need attention

• Odours near manholes or inspection chambers.
• Slow drainage from internal drains.
• Damp patches or unusually lush grass along the route of a line.
• Sinking tiles or asphalt above a line or around a manhole.
• A drop in fire or irrigation pressure with no obvious cause.
• Water collecting in the same spot after every rainfall.

CCTV inspection

On sewer and stormwater lines a special camera can be sent inside the pipe to see it from within. This inspection reveals sediment, roots, cracks and misaligned joints without any digging. It is useful at handover and whenever a problem appears later. The result pinpoints where a repair is needed, instead of digging in several places to find it.

Exercising the valves

A valve that is not moved for a long time can seize and fail to work when it is needed. It is therefore worth opening and closing valves periodically as part of the maintenance programme. This matters especially in the fire network, because it is an emergency system.

What varies by region

In sandy areas, sand in the stormwater network is the most prominent issue. In coastal cities, metal parts and covers need checking for corrosion. In areas with hard water, drippers block with mineral deposits more often and need more frequent cleaning.

It also helps for the owner to appoint one party to be responsible for following up on the networks, whether that is the project's own maintenance team or a specialist contractor. That way observations do not get lost between several parties, and every issue has someone who owns it.

Building networks on an existing, occupied site

Not every network project starts on empty land. Sometimes the task is renewing an old network in an occupied compound, adding an irrigation network to an existing palace, or separating rainwater from sewage in a commercial project that is already operating. This kind of work needs different planning from a vacant plot.

Keeping services running during the work

On an occupied site, sewer or water service cannot be cut off from residents for long. The work is therefore carried out in short sections. A temporary bypass line is prepared when needed, and the connection between the old and new lines is made within a short, defined window that residents are told about in advance.

Uncovering the existing network first

• Open existing manholes, measure their levels and identify the direction of the lines.
• Inspect old lines by camera to understand their real condition.
• Decide what can be kept and what must be replaced.
• Locate undocumented cables and lines by hand before excavating.

Excavating through existing roads and pavements

Working in an existing compound means cutting asphalt and tiles cleanly instead of breaking them. Vehicle and pedestrian movement around the excavation must be organised, and trenches closed or covered at the end of each working day. After backfilling, the surface is reinstated over compacted layers so the trace of the excavation does not reappear later.

New site compared with existing site

Communicating with residents

Success on an occupied site depends heavily on communication. Residents or tenants should be told which areas are affected and when any interruption will happen. Safe alternative walkways should be provided, and there should be one responsible person they can turn to. These steps reduce disruption and make everyone more cooperative.

Working on an existing site is harder than working on new land. Good planning, however, makes it possible with minimal disruption, and without residents feeling that daily life has stopped because of the works.

How to choose a networks contractor

Choosing a contractor for infrastructure works is a decision that stays with you for a long time, because most of the work disappears under the soil shortly after it is done. You will not be able to judge its quality by looking at it after handover. You therefore need to judge the way the contractor works before the job begins.

Questions to ask before signing

• Will the contractor visit the site and review the drawings before pricing.
• Does the quotation state the pipe types, diameters and lengths in detail.
• Are the tests named explicitly for each network.
• Will an engineer follow levels and gradients on site.
• Will you receive photographs of each stage before backfilling.
• Is the warranty written and documented in the contract.

Warning signs

A one line quotation does not give you a clear picture. A contractor who gives a price before seeing the drawings or the site is relying on guesswork. The same applies to a contractor who sees testing as wasted time or suggests backfilling straight away to speed things up.

Watch out as well for work split between several parties. When one contractor excavates, another lays the pipes and a third tests them, coordination breaks down and so does accountability. When a problem appears, each party blames the others.

What a good quotation contains

A good quotation begins with a description of the scope of work. It then lists the quantities for each network and each diameter, followed by the manholes, their types and any special fittings. Next come excavation, bedding, backfilling and compaction, then the tests and how their results will be delivered. It ends with exclusions, the warranty and a payment schedule tied to stages of the work.

This clarity does not only protect you. It protects the whole project from disputes during construction, and it makes handover a calm step because every party has known what was expected of them from the very beginning.

How YAMIC works on network projects

Yam Integrated Construction has its head office in Riyadh, in the Al Suwaidi district, and our teams carry out infrastructure works in cities across Saudi Arabia, including Jeddah, Makkah, Madinah, Dammam, Tabuk and Hail. The way we work is the same everywhere.

• A site visit to review the drawings, the routes and the nature of the soil.
• A written quotation that sets out quantities, pipe types, diameters, manholes and the tests included.
• Engineering supervision of excavation, pipe laying and levels at every stage.
• Photo updates sent to you as the work moves forward, so you can follow the project wherever you are.
• A written warranty documented in the contract after handover.

One responsible team

We supply approved materials that match the drawings and work with one team that is responsible from excavation through to backfilling. That means you deal with one party that owns the result, instead of moving between several contractors and trying to work out who is accountable when something goes wrong.

Records built as the work moves

Test results, level checks and stage photographs are gathered section by section during the job. By the time the network is handed over, the as built drawings and the handover file are ready to be reviewed with you, rather than assembled in a rush at the end.

Linking related works

If your project needs complementary works, such as concrete water tanks or buildings, they can be planned together with the networks in a single programme. This keeps levels, routes and connections consistent across the site and avoids the clashes that appear when separate parties plan in isolation.

To learn more about the scope of this service, visit our infrastructure and networks page, or send us your drawings and we will arrange a site visit and prepare a clear written quotation for you.