Formation of Drains as Ecological and Groundwater-Recharge Corridors

UPPER BUDDHA DARYA

Formation of Drains as Ecological and Groundwater-Recharge Corridors Scientific Assessment of the Upper Buddha Darya Drainage System and Its Impact on the Floodplains of River Satluj

The PAC Team travelled on 09 August 2026 through the eastern floodplain region of Ludhiana District to study, assess, and conceptualize the formation, restoration, and ecological significance of the Upper Buddha Darya drainage system.

The purpose of the assessment was not merely to examine the present condition of individual drains, but to understand the entire natural hydrological network comprising drains, wetlands, oxbow lakes, floodplain depressions, groundwater-recharge zones, and their eventual connectivity with River Satluj.

The following critically important drains and water bodies were studied:

• Beela–Koom Kallan Drain
• Charan Kamal Drain
• Gehlewal Drain
• Neelon–Koom Drain
• Mattewara Drain
• Miami–Ratangarh–Behlewal Oxbow Lake System

The broad geographical landscape is bounded by River Satluj, Chaunta Mand, Machhiwara, Beela, Chamkaur Sahib, Sirhind Canal/Neelon area, Kohara, Budhewal, and Dhanansu.

This entire landscape must be understood as a single interconnected floodplain hydrological system, rather than as a collection of isolated drains.

1. Upper Buddha Darya as a Remnant of the Historical Satluj Floodplain

The present-day Buddha Darya and its associated drainage network occupy portions of an ancient floodplain landscape associated with the historical movement of the River Satluj.

Over centuries, changes in river morphology and the shifting course of the Satluj left behind abandoned channels, floodplain depressions, wetlands, oxbow formations, and natural drainage pathways.

These geomorphological features subsequently evolved into highly productive ecological systems supporting:

• Groundwater recharge
• Seasonal floodwater retention
• Wetlands and aquatic habitats
• Native vegetation
• Fisheries and aquatic organisms
• Agricultural productivity
• Soil moisture retention
• Biodiversity corridors
• Natural filtration of surface water

The historical Machhiwara forests, with the surviving Mattewara Jungles, are remnants of this larger ecological landscape.

Therefore, the Upper Buddha Darya drainage system should be treated as ecological infrastructure of the Satluj floodplain.

2. The Fundamental Scientific Function of a Natural Drain

A natural drain is not inherently a “Ganda Nalla” or dirty drain.

A functioning natural drainage channel performs several ecological and hydrological functions simultaneously:

Rainfall → Surface Runoff → Drainage Channel → Wetland/Oxbow/Floodplain → Infiltration → Groundwater Recharge → Base Flow → River System

The system slows, stores, filters, and redistributes water.

When natural drains are converted into conduits for untreated sewage and industrial effluents, this entire ecological process is disrupted.

The drain changes from a hydrological corridor into a pollution corridor.

This distinction is fundamental to the restoration of Upper Buddha Darya.

3. BOD – Biochemical Oxygen Demand

BOD is an indicator of biodegradable organic pollution.

Biochemical Oxygen Demand represents the amount of dissolved oxygen required by microorganisms to biologically decompose biodegradable organic matter in water.

When untreated sewage, dairy waste, and other organic wastes enter a drain, BOD increases.

High BOD means:

More organic matter → More microbial decomposition → Greater oxygen consumption → Lower Dissolved Oxygen (DO)

As DO falls:

• Fish and aquatic organisms become stressed.
• Sensitive species disappear.
• Fish mortality can occur under severe oxygen depletion.
• Anaerobic conditions develop.
• Foul-smelling gases may be generated.
• Aquatic biodiversity progressively collapses.

This provides a scientific explanation for observations such as dead fish and foul odour at confluence points.

The ecological consequence is not simply “dirty water”; it represents a transition from an oxygen-supported aquatic ecosystem to an oxygen-depleted and biologically degraded system.

4. COD – Chemical Oxygen Demand

Chemical Oxygen Demand represents the oxygen equivalent required to chemically oxidize oxidizable substances present in water.

COD is particularly important in an industrially influenced drainage system because wastewater may contain substances that are:

• Difficult to biodegrade
• Toxic to microorganisms
• Chemically reactive
• Industrially derived
• Associated with dyes, chemicals, and other contaminants

A high COD indicates a substantial oxidizable pollution load.

Where both BOD and COD are high, the water body may experience severe oxygen stress.

The relationship can therefore be understood as:

High BOD + High COD → High Oxygen Demand → Low DO → Aquatic Stress → Fish Mortality → Ecological Collapse

The BOD/COD relationship can also provide useful information about the biodegradability and character of wastewater and should therefore form part of systematic monitoring of the Upper Buddha Darya drainage network.

5. pH – Chemical Stability of the Aquatic Ecosystem

pH determines whether water is acidic, neutral, or alkaline.

Natural aquatic ecosystems generally function within a relatively stable pH range. Sudden or sustained deviations can affect:

• Fish physiology
• Aquatic insects
• Plankton
• Microbial communities
• Nutrient availability
• Toxicity of certain contaminants
• Soil chemistry
• Groundwater quality

Industrial discharges can alter pH significantly.

This is particularly important because pH does not operate independently.

The toxicity and mobility of several contaminants can change with pH.

Therefore:

pH alteration → Chemical equilibrium changes → Contaminant behaviour changes → Ecological and groundwater risks increase

Continuous or periodic pH monitoring at strategic locations is therefore essential.

6. TDS – Total Dissolved Solids

Total Dissolved Solids represent the concentration of dissolved substances in water, including various inorganic salts, minerals, and other dissolved constituents.

High TDS can arise from:

• Industrial wastewater
• Domestic sewage
• Dairy waste
• Agricultural return flows
• Dissolved salts
• Chemical residues

TDS is particularly important for the floodplain because water from the drainage system may infiltrate into the soil and contribute to groundwater recharge.

Where polluted water is repeatedly allowed to infiltrate, the floodplain may become a pathway for transferring dissolved contaminants from:

Surface Water → Soil → Vadose Zone → Aquifer

This creates a long-term groundwater-quality risk.

7. Groundwater Recharge: The Most Critical Hydrological Consideration

Floodplains are naturally important groundwater-recharge environments.

During rainfall and seasonal flooding, water occupies natural depressions, drains, wetlands, and abandoned channels.

A portion of this water infiltrates through the soil profile.

The process may be represented as:

Surface Water
↓
Floodplain Storage
↓
Infiltration
↓
Soil/Vadose Zone
↓
Groundwater Recharge
↓
Aquifer

However, if the recharge water is contaminated, the same hydrological mechanism can transport contaminants downward.

Therefore, the objective cannot simply be to increase recharge.

The scientific objective must be:

“Clean Water Recharge, Not Polluted Water Recharge.”

This principle should become fundamental to the restoration of Upper Buddha Darya.

8. Floodplain Soil as a Natural Filter – But Not an Infinite Filter

Floodplain soils can provide natural attenuation through:

• Sedimentation
• Filtration
• Adsorption
• Microbial degradation
• Chemical transformation
• Plant uptake

However, these processes have finite capacity.

Continuous discharge of polluted wastewater can exceed the natural assimilative capacity of the soil and wetland system.

Once the contaminant loading exceeds this capacity:

Pollutant Loading > Natural Assimilative Capacity

the system begins to accumulate contaminants.

This can progressively affect:

• Soil health
• Microbial communities
• Vegetation
• Surface water
• Shallow groundwater
• Deeper aquifers

Thus, the floodplain must never be treated as an unlimited natural treatment plant for untreated sewage or industrial effluents.

9. Ecological Succession and Pollution-Induced Ecological Regression

Natural ecological succession generally progresses from simpler communities towards increasingly complex and stable ecosystems.

In a healthy floodplain:

Open Water → Plankton → Aquatic Plants → Invertebrates → Fish → Birds → Riparian Vegetation → Mature Ecological Community

Pollution can reverse or distort this process.

High organic loading, low DO, abnormal pH, and excessive dissolved solids can eliminate sensitive organisms first.

The ecosystem may then shift towards pollution-tolerant organisms.

This produces:

Biodiverse Ecosystem → Stress-Tolerant Species → Low Diversity → Anaerobic Conditions → Ecological Degradation

Therefore, pollution is not merely changing the appearance of the drain.

It is changing the direction of ecological succession.

10. BOD, COD, pH and TDS Must Be Read Together

No single parameter provides the complete picture.

A scientific assessment should interpret these parameters together with:

• Dissolved Oxygen (DO)
• Electrical Conductivity (EC)
• Temperature
• Turbidity
• Total Suspended Solids (TSS)
• Ammoniacal Nitrogen
• Nitrate
• Phosphate
• Chloride
• Sulphate
• Heavy Metals
• Faecal Coliforms
• Total Coliforms
• Oil & Grease
• Specific industrial contaminants

A useful conceptual framework is:

BOD/COD → Organic & Oxidizable Pollution

DO → Immediate Ecological Stress

pH → Chemical Environment

TDS/EC → Dissolved Chemical/Salt Load

TSS/Turbidity → Sediment & Particulate Load

Faecal Indicators → Sewage Contamination

Heavy Metals/Industrial Contaminants → Toxicological & Long-Term Groundwater Risk

Together, these parameters provide a much more reliable picture of the ecological condition of the drainage system.

11. Neelon Drain and Koom Drain: A Natural Experiment

The observed conditions around the confluence of Koom Drain and Neelon Drain near Koom Kallan Bridge are particularly significant.

The Neelon system receives water associated with the Sirhind Canal, while Koom Drain carries polluted flows from upstream settlements and drainage catchments from Beela onwards.

When relatively cleaner canal water is available, dilution can temporarily reduce the apparent concentration of pollutants.

However:

Dilution is not Treatment.

If pollution loading remains unchanged, dilution merely reduces concentration at a particular location and time.

When canal flows are reduced or stopped, the underlying pollution load becomes more apparent.

The reported occurrence of fish mortality and foul odour around the confluence therefore warrants systematic scientific investigation through simultaneous upstream and downstream sampling.

Such monitoring should include:

• BOD
• COD
• DO
• pH
• TDS
• EC
• TSS
• Ammonia
• Nutrients
• Faecal coliforms
• Heavy metals
• Relevant industrial contaminants

The results should be compared during:

Canal-flow conditions vs. non-canal-flow conditions.

This would establish scientifically whether dilution is masking the underlying pollution load.

12. Charan Kamal Drain – Ecology, Heritage and Water Quality

The Charan Kamal Drain has additional cultural and historical significance associated with the sacred landscape of Gurdwara Charan Kamal Sahib and the historical footprints associated with Shri Guru Gobind Singh Ji.

A watercourse carrying untreated sewage through such a historically and spiritually important landscape represents both an ecological failure and a heritage-management concern.

The restoration objective should therefore be:

Clean Water + Heritage Conservation + Ecological Restoration

rather than simply channelizing the drain.

13. Industrialization and Floodplain Risk

The proposed and developing industrial landscape in this region makes protection of the floodplain drainage network even more critical.

Particular attention is required wherever industrial development, industrial parks, roads, warehouses, or other infrastructure are proposed within or close to floodplain areas.

The principle should be:

No industrial development should compromise the natural drainage, flood-storage capacity, groundwater-recharge function, or ecological connectivity of the Satluj floodplain.

The Dhanansu Integrated Industrial Park, being situated on the northern side of Buddha Darya and within the broader Satluj floodplain landscape, requires particular hydrological scrutiny.

Industrial planning must therefore consider the entire catchment–drain–floodplain–aquifer–river relationship, rather than assessing individual plots or projects in isolation.

14. Encroachment Is a Hydrological Threat

Encroachment upon drains, wetlands, oxbow lakes, and floodplain depressions has consequences far beyond the loss of public land.

It can:

• Reduce drainage capacity
• Restrict floodwater movement
• Destroy recharge zones
• Reduce temporary flood storage
• Increase flood peaks
• Fragment aquatic habitats
• Block natural channels
• Encourage waste dumping
• Alter groundwater recharge patterns

Similarly, cultivation and dumping of industrial fly ash or other waste in floodplain areas can introduce contaminants directly into the soil-water system.

Therefore:

Protection of Drainage Corridors = Protection of Flood Security + Groundwater + Biodiversity + Public Health

15. The Miami–Ratangarh–Behlewal Oxbow Lake System

Oxbow lakes are geomorphological signatures of former river channels and are important components of floodplain ecology.

They can function as:

• Seasonal flood-storage areas
• Groundwater-recharge zones
• Fish habitats
• Bird habitats
• Biodiversity refuges
• Sediment traps
• Nutrient-processing systems

Their degradation through encroachment, cultivation, waste dumping, or sewage inflow represents the loss of an important natural component of the Satluj floodplain.

These water bodies should therefore be mapped, demarcated, and restored as floodplain ecological assets.

16. From “Ganda Nalla” to “Natural Water Infrastructure”

The terminology itself needs to change.

Calling a natural drainage channel a “Ganda Nalla” creates an administrative and social mindset in which the watercourse is treated as a place where waste can be discharged.

This is scientifically and environmentally counterproductive.

These channels should instead be recognized as:

Natural Water Infrastructure

Their functions include:

Drainage + Flood Management + Groundwater Recharge + Biodiversity + Wetland Connectivity + Ecological Flow + River Protection

The restoration strategy must therefore aim to restore the natural functions of the drainage network, while ensuring that municipal sewage and industrial wastewater are separately collected, treated, and reused/discharged only after meeting applicable standards.

17. Proposed Scientific Monitoring Network

PAC recommends establishing an Upper Buddha Darya Integrated Water Quality & Hydrology Monitoring Network.

Sampling stations should be established:

1. At the origin/upstream point of each major drain.
2. Before major settlements.
3. Downstream of settlements.
4. Before industrial discharge locations.
5. At major confluences.
6. At the Koom–Neelon confluence.
7. At the beginning of Buddha Darya at Koom Kallan.
8. At major CETP/STP discharge points.
9. At oxbow lakes and wetlands.
10. At selected groundwater wells along the floodplain.

The monitoring should include surface water + sediment + soil + groundwater.

Only such a multi-media approach can establish whether pollution is remaining within the surface-water system or migrating into the floodplain and aquifer.

18. Establish a Baseline Before Further Transformation

Before further industrialization, infrastructure development, or land-use conversion occurs in the region, a scientifically defensible hydrological and ecological baseline should be established.

This baseline should include:

• Drainage mapping
• Historical river channels
• Floodplain boundaries
• Wetlands and oxbow lakes
• Groundwater levels
• Groundwater quality
• Surface-water quality
• Soil quality
• Biodiversity
• Seasonal flow patterns
• Flood-storage capacity
• Recharge zones
• Existing encroachments
• Existing pollution sources

Without such a baseline, the ecological consequences of future land-use transformation cannot be adequately measured.

19. Restoration Strategy for Upper Buddha Darya

PAC proposes a five-stage restoration philosophy:

1. MAP

Map the entire historical and present drainage network, wetlands, oxbow lakes, floodplains, and recharge zones.

2. PROTECT

Demarcate drains, wetlands, and floodplain areas and prevent further encroachment.

3. DE-POLLUTE

Stop the entry of untreated sewage, industrial effluents, and dairy waste into natural drainage channels.

4. RESTORE

Restore natural flow, ecological connectivity, floodplain storage, wetlands, and native riparian vegetation.

5. RECHARGE

Promote only clean-water infiltration and groundwater recharge through restored wetlands, ponds, floodplain depressions, and natural drainage corridors.

20. The Core Scientific Principle

The Upper Buddha Darya cannot be restored merely through beautification, desilting, or channel construction.

The fundamental issue is hydrological restoration.

The objective should be to restore the natural relationship:

RAIN → DRAIN → FLOODPLAIN → WETLAND → GROUNDWATER → SATLUJ

rather than the present destructive relationship:

SEWAGE + INDUSTRIAL EFFLUENT → DRAIN → POLLUTED FLOODPLAIN → CONTAMINATED RECHARGE → SATLUJ

The first is an ecological and hydrological cycle.

The second is a pollution-transfer mechanism.

CONCLUSION

The Upper Buddha Darya drainage network represents much more than a collection of drains.

It is a surviving component of the historical Satluj floodplain hydrological system, with direct implications for groundwater recharge, flood management, biodiversity, ecological succession, soil health, and the long-term sustainability of the region.

The persistent discharge of untreated sewage, industrial effluents, and dairy waste into these natural channels has progressively converted natural water infrastructure into pollution infrastructure.

Elevated BOD and COD can consume dissolved oxygen and cause aquatic-system collapse; abnormal pH can alter chemical and biological processes; elevated TDS and other dissolved contaminants can compromise soil and groundwater quality. Where polluted surface water infiltrates the floodplain, the contamination pathway can extend from the drain into the aquifer.

Therefore, dilution cannot be considered treatment, channelization cannot be considered restoration, and beautification cannot substitute for pollution control.

The scientific priority must be to stop pollution at source, restore natural drainage connectivity, protect floodplains and wetlands, recover groundwater-recharge functions, and establish continuous water-quality and groundwater monitoring.

A Drain Is Not a “Ganda Nalla”.

A Natural Drain Is an Ecological and Hydrological Asset.

Protect the Drain → Protect the Floodplain → Protect Groundwater → Protect River Satluj → Protect Future Generations

Col CM Lakhanpal
Member, PAC – Mattewara Jungles, River Satluj & Buddha Darya, Ludhiana
94171 38044