Why Building Drainage is Important

  1. Keeping Areas Dry: Building drainage systems help remove water from under buildings. DRAINAGE SYSTEM FOR BUILDINGS
    This prevents water from gathering and causing damage. By keeping the area dry, we avoid problems like leaks, decay, and weakening of the building’s structure.
  2. Preserving Building Value: When a building stays dry, its materials stay in good condition for longer.
    This has helped maintain its value over the years. Proper drainage prevents mould growth, which can harm the building and reduce its worth.
  3. Promoting a Healthy Environment: Moisture can lead to the growth of mould and mildew, which can be harmful to our health.
    Building drainage helps keep the inside environment dry and fresh. This reduces the risk of breathing problems and other health issues for the people living or working there.

Definition drainage system 

Sub-surface drainage plays a crucial role in protecting buildings from underground water.

It mainly involves using pipes with holes or slits to remove excess water from below the surface.

Building drainage refers to all the necessary methods used to shield buildings from damage caused by moisture or humidity from the surrounding soil.

Let’s explore the significance of sub-surface drainage in simpler terms. DRAINAGE SYSTEM FOR BUILDINGS

Why Sub-Surface Drainage is Important:

  1. Removing Underground Water: Sub-surface drainage systems are designed to eliminate water that accumulates below the ground. By effectively removing this water, we prevent it from seeping into the building and causing damage.
  2. Protecting Against Moisture: Buildings are vulnerable to the negative effects of moisture from the soil. Sub-surface drainage helps in keeping the surrounding soil dry, reducing the risk of moisture-related issues such as dampness, decay, and mould growth.
  3. Preserving Building Stability: Excessive underground water can weaken the foundation of a building over time. Sub-surface drainage helps in maintaining the stability and structural integrity of the building by preventing soil erosion and potential foundation problems.

Methods Used in Sub-Surface Drainage:

  1. Perforated or Slit Pipes: These pipes, with small holes or slits, are buried underground to collect and redirect water away from the building. The perforations or slits allow water to enter the pipes while preventing soil from clogging the system.
  2. Gravel or Aggregate Bed: A layer of gravel or aggregate material is placed around the pipes to facilitate proper water flow and prevent soil from obstructing the drainage system. It acts as a filter and helps in distributing water evenly. DRAINAGE SYSTEM FOR BUILDINGS

Types of Plumbing Systems in Buildings

Pumps are of two types:
• Submersible pumps, and
• Open-type Pumps


  1. Submersible Pumps: Submersible pumps are designed to be fully submerged in water or other fluids. T
    hey are sealed units that can operate underwater without any issues. DRAINAGE SYSTEM FOR BUILDINGS
    These pumps are commonly used for draining water from basements, wells, or other areas where the water level is high. Since they are placed directly in the water, they can effectively pump out large volumes of fluid.
  2. Open-Type Pumps: Open-type pumps, on the other hand, are not meant to be submerged in water.
    They are installed above the fluid level and draw the fluid through an inlet pipe. These pumps work by using an impeller,
  3. which is a rotating component that creates suction and propels the fluid. Open-type pumps are often used for various applications, such as pumping water from a pool or transferring fluids from one place to another.

Types of Drainage Systems in Buildings

  1. Waste Water Drainage

  2. Soil Water Drainage


  1. Waste Water Drainage: Waste water drainage refers to the system that manages and removes used water from various sources, such as sinks, toilets, showers, and appliances like washing machines and dishwashers. DRAINAGE SYSTEM FOR BUILDINGS
    This system ensures the proper disposal of waste water and prevents it from accumulating within the building.
    It typically includes pipes, drains, and sewer lines that carry wastewater to treatment plants or sewage systems.
  2. Soil Water Drainage: Soil water drainage focuses on managing excess water present in the soil around a building.
    It aims to prevent waterlogging and excessive moisture that can negatively affect the building’s foundation, plants, and overall stability.
    Soil water drainage systems typically involve techniques like using drainage pipes, gravel or aggregate layers, and proper slope or grading to redirect excess water away from the building’s vicinity.

Common Drainage Problems:

  1. Improperly Installed Downspouts and Gutters: When downspouts and gutters are not installed correctly, water may not be effectively directed away from the building.
    This can lead to water pooling around the foundation, potentially causing damage and water seepage.
  2. Improper Grading: Poor grading refers to the incorrect slope or levelling of the ground around the building.
    If the ground slopes towards the structure, water can accumulate near the foundation, leading to water infiltration and structural issues.
  3. Runoff From Neighbors: If your neighbours’ properties have inadequate drainage systems, excess water can flow onto your property.
    This can result in water pooling and potential water damage to your building.
  4. Your Landscaping: Improper landscaping can contribute to drainage problems. For example,
    if you have landscaping features like poorly placed flowerbeds or retaining walls that obstruct water flow, it can lead to water accumulation and drainage issues.
  5. Roots in Your Drainage Pipes: Tree roots can infiltrate and block drainage pipes, causing water to back up and potentially damage the pipes.
    This can result in poor drainage and potential flooding.
  6. Surface Depressions: Low areas or depressions in the ground can collect water, creating standing water issues.
    This can occur due to settlement, erosion, or poor construction practices.
  7. Your Soil: The type and composition of soil on your property can impact drainage. For instance, clay soil has poor drainage capabilities, while sandy soil drains water quickly.
    If your soil has low permeability, it can result in water pooling on the surface.