LESSON 14.1 — Physical Infrastructure — Water, Sanitation, Sewerage, Storm Water, Solid Waste
A. Standard Map
| Topic | Governing Source | Exam Focus |
|---|---|---|
| Physical vs social infrastructure | Definitions | Distinction |
| Water supply — India norms | CPHEEO Manual; URDPFI 135 LPCD | Norms + computation |
| Water supply system components | Source, treatment, transmission, distribution | Components + flow |
| Sewerage / sanitation | CPHEEO; 80% of water = wastewater | Norms + types |
| Storm water drainage | Separate from sewerage; design rainfall intensity | Norms + computation |
| Solid Waste Management (SWM) | SWM Rules 2016; ~0.5 kg/capita/day urban | Norms + hierarchy |
| Swachh Bharat Mission-Urban | 2014; ODF, SWM | Scope + milestones |
| AMRUT | 2015; water supply, sewerage for 500 cities | Scope |
| Telangana schemes | Mission Bhagiratha; Mission Kakatiya | State-specific |
B. Why It’s Used
Paper II §14 of the TGPSC syllabus specifies “Utilities and services planning and implications for health and environmental protection. Planning for physical Infrastructure, water supply system, sanitation and sewer system, storm water system, solid waste disposal and management.” Physical infrastructure is the most-tested quantitative module in the exam — every Master Plan, every project DPR, every ULB budget involves water supply design, sewerage sizing, drainage computation, and SWM planning. The Town Planning Assistant will encounter these daily. The exam tests per-capita norms (water, waste), system components (water supply chain, sewerage types), drainage computation (rational method), and SWM Rules 2016 (the modern framework). Telangana-specific: Mission Bhagiratha (state-level water supply), Mission Kakatiya (tank restoration), GHMC’s SWM contracts.
C. Mechanism in Words
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Physical infrastructure is the network of engineered systems that provide utility services to a city — water supply, sewerage and sanitation, storm water drainage, solid waste management, electricity, and gas. It is distinct from social infrastructure (covered in Lesson 14.2) — schools, hospitals, parks, fire stations — which provides human services rather than utility flows. Physical infrastructure is typically managed by parastatal boards (Hyderabad Metropolitan Water Supply and Sewerage Board — HMWSSB), ULB departments (most ULBs run their own SWM), or private concessionaires (post-reform power distribution). The planner’s role: integrate infrastructure planning into Master Plans, prepare DPRs, monitor service delivery, and approve infrastructure-conscious land development.
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Water supply in India follows a standard chain: source → treatment → transmission → distribution → consumer. Source — surface water (rivers, reservoirs, lakes — for Hyderabad, the Krishna River via Akkampally, the Manjira River, Osman Sagar and Himayat Sagar historically) or groundwater (tube wells, open wells). Treatment — raw water from source is treated at a Water Treatment Plant (WTP) to remove turbidity, bacteria, and dissolved impurities. The standard treatment process: aeration → coagulation (alum) → flocculation → sedimentation → filtration (sand/gravel) → disinfection (chlorine, sometimes ozone or UV). Transmission — treated water is conveyed through transmission mains (large-diameter pipes, sometimes tunnels or aqueducts) to service reservoirs within the city. Distribution — service reservoirs (Elevated Service Reservoirs — ESRs, or Ground Service Reservoirs — GSRs) feed the distribution network of smaller pipes that reach consumers. Consumer connections — final service pipes deliver water to households, often metered, sometimes via public standposts in informal settlements.
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Per-capita water supply norms are set by the CPHEEO (Central Public Health and Environmental Engineering Organisation) Manual on Water Supply and Treatment, and adopted by URDPFI 2015. The standard norm: 135 litres per capita per day (LPCD) for domestic consumption in piped, metered connections with sewerage. With only public standposts (no household connection): 40 LPCD. In cities with sewers but limited piped supply: 70 LPCD. The 135 LPCD norm is the design figure for most Indian urban water supply projects. Breakdown of the 135 LPCD: ~75 LPCD domestic use (drinking, cooking, bathing, washing, flushing); ~30 LPCD non-domestic / industrial / commercial; ~15 LPCD public use (street washing, parks, fire); ~15 LPCD losses (the unavoidable minimum, often 30–40% in Indian systems — the gap is the principal operational problem).
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Sewerage and sanitation cover the safe removal and treatment of human excreta and wastewater. In Indian cities, three sanitation modes coexist: (a) Piped sewerage — the modern standard in metros and large cities; household toilets connected via lateral sewers to branch sewers, mains, interceptors, and Pumping Stations (PS) to a Sewage Treatment Plant (STP) where sewage is treated to discharge standards before release to water bodies or land. (b) On-site sanitation — septic tanks with soak pits, the dominant mode in smaller cities and peri-urban areas; the septic tank provides primary treatment, the soak pit infiltrates liquid into soil; periodic desludging is required (often neglected). (c) Open defecation — eliminated in most cities by Swachh Bharat Mission-Urban (declared ODF in 2019); persists in some informal settlements. The CPHEEO Manual on Sewerage and Sewage Treatment sets Indian design standards; the norm is that sewage flow ≈ 80% of water supply (people consume water but only ~80% returns as wastewater, with evaporation, irrigation, and other losses accounting for the rest).
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Sewage Treatment Plants (STPs) treat raw sewage to discharge standards before release to the environment. Major STP treatment processes: Primary — physical removal of settleable solids (screens, grit chambers, primary clarifiers); removes ~50% of suspended solids and ~30% of BOD. Secondary — biological treatment of dissolved organics; common methods: Activated Sludge Process (ASP), Trickling Filters, Oxidation Ponds, Upflow Anaerobic Sludge Blanket (UASB), Sequencing Batch Reactor (SBR), Moving Bed Biofilm Reactor (MBBR); removes ~85–95% of BOD. Tertiary — advanced polishing for nutrient removal (N, P), filtration, disinfection; used when effluent is reused (industrial cooling, irrigation, flushing). The treated effluent discharge standards (per CPCB / State PCB): BOD ≤ 10–30 mg/L, TSS ≤ 20–50 mg/L, depending on receiving water body classification.
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Storm water drainage is engineered as a separate system from sewerage — distinct from the combined sewerage systems of some older cities (Mumbai, Kolkata historically). Storm water drains rainwater from streets, roofs, and other surfaces via roadside channels, underground drains, and natural watercourses into receiving water bodies. Design principles: (a) design rainfall intensity (typically 1-hour, 5-year or 10-year return period); (b) catchment area (the area draining to a given point); (c) runoff coefficient (the share of rainfall that becomes runoff — varies by surface: 0.7–0.95 for paved, 0.10–0.30 for unpaved); (d) time of concentration (time for water to flow from the farthest point of catchment to the design point); (e) drain sizing by the Rational Method: Q = (1/3.6) × C × i × A, where Q is peak discharge (cumec), C is runoff coefficient, i is rainfall intensity (mm/hr), and A is catchment area (sq km).
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Solid Waste Management (SWM) in India is governed by the Solid Waste Management Rules, 2016 (replacing the earlier Municipal Solid Waste Rules 2000). The Rules cover segregation, collection, transportation, processing, and disposal of solid waste. The waste hierarchy (most-to-least preferred): reduce → reuse → recycle → recover → treat → dispose. Segregation at source into three streams is mandatory: wet (biodegradable — food waste, garden waste), dry (recyclable — paper, plastic, metal, glass), and hazardous / domestic hazardous (batteries, paint, medicines). Collection is door-to-door in most cities; transportation is via covered vehicles to transfer stations or directly to processing/disposal sites. Processing options: composting (aerobic or vermi), biomethanation (anaerobic digestion producing biogas), waste-to-energy (WTE) incineration (controversial in Indian conditions due to high wet-waste content), Refuse-Derived Fuel (RDF) for cement kilns. Disposal in engineered sanitary landfills (only the inerts and rejects — typically <10% of total waste if processing works well). The Swachh Bharat Mission-Urban (SBM-U, 2014) targeted Open Defecation Free (ODF) status (achieved 2019) and improved SWM; SBM-U 2.0 (2021–26) focuses on complete SWM, including city-wide ODF++ and “Water+ ” (no visible liquid waste).
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Major central schemes for physical infrastructure include AMRUT (Atal Mission for Rejuvenation and Urban Transformation, 2015) and the Smart Cities Mission (2015), both covered in earlier lessons (1.2, 6.1). AMRUT specifically targets water supply, sewerage, drainage, urban transport, and green spaces in 500 cities. Telangana’s state-level schemes: Mission Bhagiratha (2016) — a flagship scheme to provide piped drinking water to every household in Telangana, sourced from Krishna and Godavari rivers; Mission Kakatiya (2014) — restoration of 46,000+ minor irrigation tanks across Telangana, reviving the historical tank irrigation network. Together these schemes are direct applications of the water-supply principles discussed above, at state scale.
D. Core Concept Explanations
C1. Water supply chain
| Stage | Function | Hyderabad example |
|---|---|---|
| Source | Raw water | Krishna (Akkampally); Manjira; Osman Sagar |
| Treatment | WTP — clean raw water | Mir Alam, Sahebnagar WTPs |
| Transmission | Large mains to service reservoirs | Krishna pipeline |
| Distribution | Network of smaller pipes to consumers | HMWSSB distribution |
| Consumer | Tap connection (metered) or standpost | Household or community connection |
C2. CPHEEO water supply norms
| Service level | LPCD |
|---|---|
| Public standpost (no household connection) | 40 |
| Piped, no sewerage | 70 |
| Piped with sewerage | 135 (design norm) |
| Breakdown of 135 LPCD | 75 domestic + 30 non-domestic + 15 public + 15 losses |
C3. Sanitation modes
| Mode | Where used | Treatment |
|---|---|---|
| Piped sewerage | Metros, large cities | STP (primary + secondary, sometimes tertiary) |
| On-site (septic tank + soak pit) | Smaller cities, peri-urban | Septic tank primary; periodic desludging |
| Open defecation | Largely eliminated by SBM-U ODF (2019) | None |
C4. STP treatment stages
| Stage | Function | Removal |
|---|---|---|
| Primary | Physical: screens, grit chamber, primary clarifier | ~50% TSS; ~30% BOD |
| Secondary | Biological: ASP, Trickling Filter, UASB, SBR, MBBR, Oxidation Pond | ~85–95% BOD |
| Tertiary | Advanced: nutrient removal, filtration, disinfection | For reuse |
C5. SWM Rules 2016 — three-stream segregation
| Stream | What it contains | Disposition |
|---|---|---|
| Wet | Food, garden waste (biodegradable) | Composting / biomethanation |
| Dry | Paper, plastic, metal, glass (recyclable) | Recycling / RDF |
| Hazardous / domestic hazardous | Batteries, paint, medicines | Special disposal per Hazardous Waste Rules |
E. Worked Numericals and Parameter Tables
E1. Water supply design
A town of 200,000 population at 135 LPCD:
- Daily water demand = 200,000 × 135 = 27,000,000 L = 27 MLD
- Annual demand = 27 × 365 = 9,855 ML/year ≈ 9.86 billion litres
- With 30% losses, gross supply required = 27 / 0.7 = 38.6 MLD
E2. Sewerage design
Sewage flow ≈ 80% of water supply:
- Daily sewage = 0.8 × 27 = 21.6 MLD
- For a sewer network designed at 3× dry weather flow (DWF) for peak: peak = 3 × 21.6 = 64.8 MLD (peak hour equivalent)
E3. Storm water — Rational Method
A 1 sq km urban catchment (runoff coefficient 0.6) with design rainfall intensity 30 mm/hr:
- Q = (1/3.6) × C × i × A
- Q = (1/3.6) × 0.6 × 30 × 1
- Q = 18/3.6 = 5 cumec (m³/s)
This is the design discharge for the storm drain at the catchment outlet.
E4. Solid waste generation
A city of 500,000 at 0.5 kg/capita/day:
- Daily waste = 500,000 × 0.5 = 250,000 kg = 250 TPD
- Annual waste = 250 × 365 = 91,250 T/year
- If 50% is wet (compostable), 30% is dry (recyclable), and 20% is inert/reject: 125 TPD wet + 75 TPD dry + 50 TPD reject. After processing, only 50 TPD (~20%) needs landfill.
E5. Tanker delivery cost
A 12,000-litre water tanker costs ₹1,200 to deliver. Per litre cost = 1,200/12,000 = ₹0.10/L. Compare: piped water supply at ₹10 per 1,000 litres = ₹0.01/L — piped is 10× cheaper than tanker. This is why piped infrastructure investment is economically justified.
F. Design Criteria
| Parameter | Standard / Typical value | Source |
|---|---|---|
| CPHEEO water supply norm (piped + sewerage) | 135 LPCD | CPHEEO Manual; URDPFI 2015 |
| CPHEEO water supply norm (standpost) | 40 LPCD | CPHEEO |
| CPHEEO sewage flow | 80% of water supply | CPHEEO |
| Typical Indian distribution loss | 30–40% (unaccounted-for water) | CPHEEO |
| Rational Method | Q = (1/3.6) C i A (cumec) | Engineering hydrology |
| Runoff coefficient (paved) | 0.7–0.95 | CPHEEO |
| Runoff coefficient (unpaved) | 0.10–0.30 | CPHEEO |
| Urban SWM generation | ~0.5 kg/capita/day | SWM Rules 2016 / CPCB |
| SBM-U ODF declared | October 2019 | SBM-U |
| SWM Rules | 2016 (replacing MSW Rules 2000) | MoEFCC |
| AMRUT coverage | 500 cities | AMRUT 2015 |
G. Application Zones
- Master Plan infrastructure chapter — water, sewerage, drainage, SWM sizing.
- ULB project DPRs — water supply augmentation, STP construction, drainage improvements.
- Layout plan approval — infrastructure capacity check for new development.
- Mission scheme implementation — AMRUT, SBM-U, Mission Bhagiratha, Mission Kakatiya.
- Pollution-control compliance — STP discharge standards; SWM Rules compliance; consent to operate.
H. Common Confusions
| Confusion | Reality |
|---|---|
| “135 LPCD is per household.” | No — per capita per day; multiply by household size for household demand. |
| “Sewerage and storm water drains are the same.” | No — sewerage carries sanitary sewage; storm water drains carry rainfall runoff. They are separate systems in modern Indian practice. |
| “Septic tanks treat water to discharge standards.” | No — septic tanks provide primary treatment only; effluent still needs soak-pit infiltration or further treatment. |
| “SWM Rules 2016 replaced AMRUT.” | No — SWM Rules 2016 regulate waste; AMRUT funds infrastructure. They are complementary. |
| “BOD removal in primary treatment is 85%.” | False — primary removes ~30% BOD; secondary removes 85–95%. |
| “Mission Bhagiratha is centrally funded.” | No — Mission Bhagiratha is a Telangana state scheme, not a central one. |
| “Rational Method Q formula has no constant.” | False — the 1/3.6 constant converts units (mm/hr × sq km → cumec). |
I. Compare & Contrast
I1. Water supply vs sewerage design
| Dimension | Water supply | Sewerage |
|---|---|---|
| Flow direction | Source → consumer | Consumer → STP → environment |
| Design flow | 135 LPCD × population | ~80% of water supply |
| Pipes | Pressurised ( pumped or gravity) | Mostly gravity (sewers slope downhill) |
| Treatment | Source → WTP → consumer | Consumer → STP → environment |
I2. Combined vs separate sewerage
| Type | Description | Used in |
|---|---|---|
| Combined | One network carries sewage + storm water together | Older cities (Mumbai, Kolkata historically) |
| Separate | Two networks — sewerage and storm water | Modern Indian practice (Hyderabad, post-reform cities) |
| Partially separate | Mostly separate but with some illegal connections | Common in practice |
J. Memory Hooks
- “135 LPCD = 75 + 30 + 15 + 15” — water supply norm breakdown.
- “Sewerage = 80% of water” — design rule.
- “Q = (1/3.6) C i A” — Rational Method.
- “0.5 kg/capita/day” — SWM generation.
- “3 streams: wet, dry, hazardous” — SWM Rules 2016.
- “Primary 30%, Secondary 85-95%, Tertiary for reuse” — STP removal percentages.
- “Mission Bhagiratha = water; Mission Kakatiya = tanks” — Telangana schemes.
- “SBM-U ODF declared 2019”.
K. Revision Ladder
| Order | Item | Time |
|---|---|---|
| 1 | Memorise the water supply chain (5 stages) | 30 min |
| 2 | Memorise CPHEEO norms (135, 70, 40 LPCD) | 15 min |
| 3 | Memorise sewerage design (80% of water; STP stages) | 30 min |
| 4 | Memorise Rational Method formula and units | 20 min |
| 5 | Practise water, sewerage, drainage, SWM arithmetic | 60 min |
| 6 | Memorise SWM Rules 2016 (3 streams; hierarchy) | 30 min |
| 7 | Memorise SBM-U milestones and AMRUT scope | 20 min |
| 8 | Map Telangana schemes (Bhagiratha, Kakatiya) | 30 min |
L. Exam Traps
| Trap | Correct response |
|---|---|
| Question lists 135 LPCD as per-household. | False — per capita per day. |
| Question pairs sewerage with storm water as one system. | False — separate in modern Indian practice. |
| Question lists primary STP as removing 85% BOD. | False — primary removes ~30% BOD; secondary removes 85–95%. |
| Question lists SWM Rules as 2000. | False — current SWM Rules are 2016 (replacing MSW Rules 2000). |
| Question lists Rational Method formula without 1/3.6 constant. | False — the constant converts units. |
| Question pairs Mission Bhagiratha with central funding. | False — Mission Bhagiratha is a Telangana state scheme. |
| Question lists SBM-U ODF declared as 2022. | False — October 2019. |
M. Answer-Writing Cues
- For water supply questions, give chain + norm + computation: “The CPHEEO water supply norm is 135 LPCD for piped supply with sewerage; for a town of 200,000 population, daily demand = 200,000 × 135 = 27 MLD.”
- For sewerage questions, give the 80% rule + STP stages: “Sewage flow is approximately 80% of water supply; STP treatment typically follows primary (30% BOD removal), secondary (85–95%), and tertiary (for reuse).”
- For drainage questions, give formula + worked discharge: “Per the Rational Method, Q = (1/3.6) C i A; for a 1 sq km catchment with C=0.6 and i=30 mm/hr, Q = 5 cumec.”
- For SWM questions, give Rules + 3 streams + hierarchy: “Per SWM Rules 2016, segregation at source into wet, dry, and hazardous streams is mandatory; the waste hierarchy is reduce → reuse → recycle → recover → treat → dispose.”
N. PYQ Integration
Pattern questions only:
Pattern question 1 — Water norm
Q. Per the CPHEEO Manual, the design water supply norm for a town with piped supply and sewerage is:
– (A) 70 LPCD
– (B) 135 LPCD ✓
– (C) 200 LPCD
– (D) 40 LPCD
Ans: (B). 135 LPCD is the design norm for full service; 70 is partial; 40 is standpost.
Pattern question 2 — Sewage
Q. As a planning rule, sewage flow is approximately what share of water supply?
– (A) 50%
– (B) 80% ✓
– (C) 100%
– (D) 120%
Ans: (B). ~80% of water supplied returns as sewage; the rest is consumed, evaporates, etc.
Pattern question 3 — Rational Method
Q. The Rational Method for storm water design peak discharge is:
– (A) Q = C × i × A
– (B) Q = (1/3.6) × C × i × A ✓
– (C) Q = C × A / i
– (D) Q = i / (C × A)
Ans: (B). The 1/3.6 constant converts mm/hr × sq km to cumec.
Pattern question 4 — MSQ
Q. Which of the following are stages of Sewage Treatment Plant (STP) processing?
– (A) Primary treatment ✓
– (B) Secondary treatment ✓
– (C) Tertiary treatment ✓
– (D) Atmospheric treatment
Ans: (A), (B), (C). “Atmospheric treatment” is not a recognised STP stage.
Pattern question 5 — Numerical
A town of 100,000 at 135 LPCD requires a daily water supply of:
– (A) 1.35 MLD
– (B) 13.5 MLD ✓
– (C) 135 MLD
– (D) 1350 MLD
Ans: (B). 100,000 × 135 = 13,500,000 L/day = 13.5 MLD.
O. Mini-Check — Lesson 14.1
- List the five stages of the water supply chain.
- State the CPHEEO water supply norm for piped supply with sewerage.
- State the breakdown of the 135 LPCD norm.
- State the CPHEEO rule for sewage flow as a percentage of water supply.
- List the three STP treatment stages and approximate BOD removal for each.
- State the Rational Method formula with units.
- State the three-stream segregation under SWM Rules 2016.
- State the SWM waste hierarchy in order.
- State the urban SWM per-capita generation rate.
- Name Telangana’s two flagship water-related state schemes.
Answers:
1. Source → Treatment → Transmission → Distribution → Consumer.
2. 135 LPCD.
3. 75 domestic + 30 non-domestic + 15 public + 15 losses.
4. ~80% of water supply.
5. Primary (~30% BOD removal); Secondary (~85–95% BOD removal); Tertiary (advanced polishing for reuse).
6. Q = (1/3.6) × C × i × A, where Q in cumec (m³/s), C = runoff coefficient, i in mm/hr, A in sq km.
7. Wet (biodegradable); Dry (recyclable); Hazardous / domestic hazardous.
8. Reduce → Reuse → Recycle → Recover → Treat → Dispose.
9. ~0.5 kg/capita/day (urban).
10. Mission Bhagiratha (piped drinking water to every household, from Krishna and Godavari); Mission Kakatiya (restoration of 46,000+ minor irrigation tanks).
Next: Lesson 14.2 — Social Infrastructure (Health, Education, Recreation, Fire) & Regional Networks.