Dollyak:
The whole civil design looks ugly and designed by an inexperienced university graduate.

Dollyak:
The whole civil design looks ugly and designed by an inexperienced university graduate.

nedu2000:
As roads get constructed nationwide,its more likely than not to see roads being constructed in already inhabited areas,how it has come to the fore that contractors due to maybe to cut cost of digging or just laziness tend not to consider the 'levels' on the houses in the said area.
They do the roads higher than the houses on the left/right of the said road/drain,and illustration is the 'rich' residents along abacha road in Port Harcourt who witness perennial flooding ,other areas abound in Lagos and many other cities!
What are we the residents suppose to do when a blessing seemingly calls to a curse?
Pls help

kkfox:
Bros na government you go blame. The contractor builds the roads while the Town Planning departments enforce setbacks, many times government won't pay compensation for properties to be demolished or as is common in PH they'll pay part and severe the buildings.

Dollyak:
The whole civil design looks ugly and designed by an inexperienced university graduate.

whirlwind7:
This doesn't make the road contractor/ construction worker selfish. He has the quality of his job to uphold, and this involves ensuring the road doesn't get flooded when it rains.
To achieve this, the road has to be slightly elevated, with drainages supplied at both sides.
The normal thing is for roads to be constructed FIRST, before buildings are sited on either sides of the road. This way, the house builder checks the road elevation, and does the proper filling on his site, to elevate it above the road level. That is the normal order. But since government hardly does things in order here, there is no choice than having it in reverse.

That's the cause of the problem here. Don't blame the road construction crew. They did their job. Government and town planning authorit. ies didn't do theirs.

lonngmann:
Always learn to make ur foundation high enough when you are building

Excelento:
The fault is from the settlers in any construction , the foundation of your house / intended house must be higher than the road that will pass through.
Your poeple build for then not for future learn from their past mistake when you are about to build your house.

sheunflexy:
op you are totally wrong,it's unfortunate that must people refuses to consinder the road level when building houses,the first thing that determine your compound and german floor is the road level,let even assume your existing road has not been done,what comes to mind is to take 200mm above the road level and tranfer it to your compound,you will assume that's the final road level when its been done,mean while the tickness of Nigeria roads can't be more than 150mm most especially state roads,take another 200mm above the compound level and that will be the level of your Germans floor,with that you are good to go,i can bet it flood won't be able to penetrate through your compound,most houses that got flooded never consider the future,always engage a professional to do your job for you.

lagbaja:
Several considerations goes into road construction. The destructive power of flowing water increases exponentially as its velocity increases. Therefore, water must not be allowed to develop sufficient volume or velocity so as to cause excessive wear along ditches, below culverts, or along exposed running surfaces, cuts, or fills. With this in mind, the topography of the construction area determines to a large extent the elevation level to which the road is taken. There are instances where the road is dug up to a lower level and other instances where the road is filled up. The drainages do not exist in silos but are interconnected and this should be done in a manner that one drainage system does not empty into another but rather into into the bigger drain such as a river or a canal. The primary concern is to ensure that The road drains quickly during Normal and flash floods because the durability of the road is determined by how well the road drains. If the construction is done with existing houses as the determinant of the road level, it is likely that the road and the houses would all be flooded and the roads damaged in no time.

nedu2000:
As roads get constructed nationwide,its more likely than not to see roads being constructed in already inhabited areas,how it has come to the fore that contractors due to maybe to cut cost of digging or just laziness tend not to consider the 'levels' on the houses in the said area.
They do the roads higher than the houses on the left/right of the said road/drain,and illustration is the 'rich' residents along abacha road in Port Harcourt who witness perennial flooding ,other areas abound in Lagos and many other cities!
What are we the residents suppose to do when a blessing seemingly calls to a curse?
Pls help

tunergy:


This Flooded portion is part of your property, were you expecting Govt to do something for you.

My friend, please Fill that portion and enjoy ya home.

geniusgenes:
Wickedness.... but then, i see the point. The road contractor is much more interested in the standard of his roads, thus, he doesnt want it retaining water after every rainfall.
Flowers That Make Your Air Freshener Useless

nedu2000:
As roads get constructed nationwide,its more likely than not to see roads being constructed in already inhabited areas,how it has come to the fore that contractors due to maybe to cut cost of digging or just laziness tend not to consider the 'levels' on the houses in the said area.
They do the roads higher than the houses on the left/right of the said road/drain,and illustration is the 'rich' residents along abacha road in Port Harcourt who witness perennial flooding ,other areas abound in Lagos and many other cities!
What are we the residents suppose to do when a blessing seemingly calls to a curse?
Pls help

lagbaja:
Several considerations goes into road construction. The destructive power of flowing water increases exponentially as its velocity increases. Therefore, water must not be allowed to develop sufficient volume or velocity so as to cause excessive wear along ditches, below culverts, or along exposed running surfaces, cuts, or fills. With this in mind, the topography of the construction area determines to a large extent the elevation level to which the road is taken. There are instances where the road is dug up to a lower level and other instances where the road is filled up. The drainages do not exist in silos but are interconnected and this should be done in a manner that one drainage system does not empty into another but rather into into the bigger drain such as a river or a canal. The primary concern is to ensure that The road drains quickly during Normal and flash floods because the durability of the road is determined by how well the road drains. If the construction is done with exi0sting houses as the determinant of the road level, it is likely that the road and the houses would all be flooded and the roads damaged in no time.

adanny01:


This is what we call road profile. There is the vertical and the horizontal road profile.

The vertical profile otherwise called elevation handles two major factors in road construction.
1. Cut/fill to achieve an even road surface. You dont expect a road design to follow the topography as it is. This is to avoid sudden ascend or descend of the car at design speeds of the road.
2. Drainage (camber) to send water off the road. Pooling of water on the road is dangerous to any car, therefore, the elevation of a road must be righ enough to clear any level of runoff water accumulation especially at the lowest elevation where water usually accumulates.

The horizontal profile handles curves which is not a concern to your issue.

I supervised a road construction during my NYSC, while the majority of the people of the street were so happy, a few houses realised there houses are in danger and sued to court. There issue is that since new drainage were constructed, this accumulated all the runoff water from the entire street to the premises which was directly on the discharge point. Flood became their daily problem. It is not the governments fault that they built their houses on the discharge area or flood plain.

VictorRomanov:
Nedu2000 There re so many factors in road and drainange design and construction that a layman is ignorant of and cannot know.

I'll try to explain.

When designing drainages, one of the aim is to have a discharge point. Without a discharge point, water in the drain would not flow. This will breed mosquitoes and cause flooding when there is heavy run off. Flooding would weaken the road base and the road would fail.

To achieve flow to a discharge point, the point of discharge should be lower in elevation than other parts of the drain. That is the drainage would have a slope tilting towards the point of discharge.

Now a street with residential buildings is to be constructed. And the discharge point of the drains in that street maybe a nearby street, a river or stream or even the drains of a high way. No matter the discharge point, the drains of the street would be higher than the discharge point so that water can flow from the streets to the discharge points. To achieve this, the drain would need to be raised. Its elevation may eventually be higher than the existing building in the area, giving raise to scenario the op is illustrating. But if this is not done, water from the stream, or the high way would discharge into the street causing flood. Its a case of choosing the lesser evil.

To avoid this, landlords and would be builders should engage a professional when starting a building project, rather than quacks. These professionals would ensure that the level of their proposed building would be higher than the level of available discharge points, even when the street has not been constructed.

So don't entirely blame the engineer or contractor.

nairaman66:
Totally unprofessional! His would have been avoidable if there is standard in this regard!

lagbaja:
Several considerations goes into road construction. The destructive power of flowing water increases exponentially as its velocity increases. Therefore, water must not be allowed to develop sufficient volume or velocity so as to cause excessive wear along ditches, below culverts, or along exposed running surfaces, cuts, or fills. With this in mind, the topography of the construction area determines to a large extent the elevation level to which the road is taken. There are instances where the road is dug up to a lower level and other instances where the road is filled up. The drainages do not exist in silos but are interconnected and this should be done in a manner that one drainage system does not empty into another but rather into into the bigger drain such as a river or a canal. The primary concern is to ensure that The road drains quickly during Normal and flash floods because the durability of the road is determined by how well the road drains. If the construction is done with existing houses as the determinant of the road level, it is likely that the road and the houses would all be flooded and the roads damaged in no time.

nedu2000:
your illustration is a bit different,as even natural runoff will occur,with or without the construction of drainage. The highland existed before they built on valleys,thats becomes their fault. Compare with my own illustration is different

Benoy:


Sir, the discharge points (turn-out) you talking about naturally are of low elevation . You don't expect water to flow up, do you?. Natural course of water must be taken into consideration when designing/constructing line drain except you re changing course, and problems like this ll always arise.

Benoy:


Sir, the discharge points (turn-out) you talking about naturally are of low elevation . You don't expect water to flow up, do you?. Natural course of water must be taken into consideration when designing/constructing line drain except you re changing course, and problems like this ll always arise.

VictorRomanov:
Nedu2000 There re so many factors in road and drainange design and construction that a layman is ignorant of and cannot know.

I'll try to explain.

When designing drainages, one of the aim is to have a discharge point. Without a discharge point, water in the drain would not flow. This will breed mosquitoes and cause flooding when there is heavy run off. Flooding would weaken the road base and the road would fail.

To achieve flow to a discharge point, the point of discharge should be lower in elevation than other parts of the drain. That is the drainage would have a slope tilting towards the point of discharge.

Now a street with residential buildings is to be constructed. And the discharge point of the drains in that street maybe a nearby street, a river or stream or even the drains of a high way. No matter the discharge point, the drains of the street would be higher than the discharge point so that water can flow from the streets to the discharge points. To achieve this, the drain would need to be raised. Its elevation may eventually be higher than the existing building in the area, giving raise to scenario the op is illustrating. But if this is not done, water from the stream, or the high way would discharge into the street causing flood. Its a case of choosing the lesser evil.

To avoid this, landlords and would be builders should engage a professional when starting a building project, rather than quacks. These professionals would ensure that the level of their proposed building would be higher than the level of available discharge points, even when the street has not been constructed.

So don't entirely blame the engineer or contractor.