Costs | Centre for Science and Environment


Costs

How much will it cost to catch rain?

When community come together to harvest rain, the per-capita investment goes down. For instance, Panchsheel Park Colony about 1000 residents pooled in Rs 4.5 lakh to harvest more than 170 million litres of water annually.

Rainwater harvesting methods are site specific and hence it is difficult to give a generalised cost. But first of all, the major components of a rainwater harvesting system - rain and catchment area - are available free of cost. A good proportion of the expenses would be for the pipe connections. By judiciously fixing up the slopes of roofs and location of rainwater outlets, this could be brought down considerably. However the cost varies widely depending on the availability of existing structures like wells and tanks which can be modified and used for water harvesting.

 

Typically, installing a water harvesting system in a building would cost between Rs 2,000 to 30,000 for buildings of about 300 sq. m. The cost estimate mentioned above is for an existing building. For instance, water harvesting system in the CSE building in Tughlakabad Institutional Area, Delhi, was set up with an investment of Rs 30,000 whereas those in the model projects ranged between Rs 70, 000 and Rs 8 lakh. The costs would be comparatively less if the system were incorporated during the construction of the building itself.

 

It is easier to calculate the payback when the rain water harvested is used for storage as it saves money spent on buying water from tankers or private suppliers. Recharging groundwater has less tangible benefits but none the less is very crucial and highly recommended.

Some basic rates of construction activities and materials have been given here, which may be helpful in calculating the total cost of a structure. The list is not comprehensive and contains only important activities meant to provide a rough estimate of the cost.

 

S. No. Item   Delhi Mumbai Pune Rajkot Chennai Kolkata
1 Ferrocement tank (above or below groundwater level) litre   3.00--above the ground -- 4.00-- above the ground    
2 PVC litre 6.00 4.25 7.00 6.00 3.00 5.4   
3 RCC litre 10.58 7.00 4.50 4.00   5.69
4 Metal tank litre   6.00 5.00 12.00   12.88
5 Drain pipe (PVC) m 380—6” dia 750--6” dia 450--6” dia 250--6” dia 55-3.5” dia 217.80 and 198.00 for UPVC pipe (Single socket 4 “ dia and double socket 4” dia respectively)
414.45 and 842.95 for GI pipe (2” dia and 4”  dia respectively)
6 Pipe laying and fitting m   -- 135 50 200 32
7 Collection chambers Each 1800----(450 mm x 450 mm) 6000—600 mm x 900 x 600 mm 2700--(450 mm x 450 mm) 1500--(450 mm x 450 mm)   7177.15 (800 mm x 800 mm x 1200 mm)
8 Filter material   2500/cum--Boulders of 40-100 mm, gravel of size 3 mm to 10 mm and coarse sand of 1 to 2mm inclusive of transport, labour charge, taxes, duties. 10000 8000 (only sand) 300 (sand) 200-road jelly of 12 mm dia  
9 Underground sump (brick work) litre 3.50 3.00 3.50 --    
10 Gutter   750 (PVC) 400 250 (with metal grating) -- 120-GI/tin sheet 326.60
11 Elbow     -- -- --    
12 First flush valve     1000 (PVC) 1300 (PVC) --   6500
13 Chlorination     ----- ---- ---    
14 Collection tap Each   ---- 300 ---   210 (bib cock)
15 Excavation (hard rock or sedimentary) cu m Soft soil-250, hard rock- 700 300 (up to 1.5 m below G.L. in hard rock) 233 (in all sorts of terrain 100 (in hard rock) 36 (in hard rock) 41.87 (sedimentary terrain)
16 PCC (PCC base) cu m 3200 3500 3092 2400   2748.60
17 Brick wall (4.5 inch or 9 inches) cu m 9"--3200, 4.5"--500 3000 (4.5 inches) 2804 (4.5 inches) 2300 (4.5 inches) 1375 (4.5”) 3292.8 for 5” and 3231.20 for 10”
18 Plastering ( with fine sand how many inches , with water proof or without water proof) cu m 250 125 (12mm thick-Internal Plaster) 207 (12mm thick-Internal Plaster) 120 (12mm thick-Internal Plaster) 40 (12mm thick-Internal Plaster) 81 (20 mm thick) and 69 (15 mm thick)
19 RCC slab cu m 1200 8000 3500 3500   10809.17
20 Removal of debris   1500/truck 2000 –L.S. 200/cu m 100 –L.S.    
21 Drilling of One Recharge Bore ( DTH or Hand bore set) m hand bore—600 mechanical--1000/m 10000 197 225 160 for 7” dia bore 931.00 (for first 50 m), 745.00 (next 50 m) and 780.00 (then next 50 m) with 550 mm dia casing
22 Casing ( PVC or MS casing  )     500-- PVC (6”  dia) 450--PVC (6”  dia) 1000--PVC (6”  dia)    
23 Additional items         15 % is fixed for contractor’s profit For recharge pit: Cost of RCC ring 3' (Precast rings )--36, Cost of RCC ring 4'--110, Cost of RCC ring 5--130', Labour charges—L.S.--200 As per PWD schedule of West Bengal

Announcements

  • The increase in urbanisation has led to increase in the fresh water demand along with wastewater generation. The current water crisis is attributed to mismanagement of water resources and emphasis on the energy as well as resource intensive centralised urban water management. Need is, for the practitioners and user communities, to implement sustainable and affordable decentralised water management practices. This short term five day course will focus on – designing rainwater harvesting (RWH) and decentralised wastewater treatment (DWWT) systems including local reuse.

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