Safe Water Options

3. Rain water-harvesting system :

UNICEF/DPHE introduced rain- water collection in some parts of the country where both surface and ground water is scarce especially during the dry season.

UNICEF along with Molt MacDonald invented Ferro-cement pre-fabricated jar of various capacities. Rainwater harvesting system may supplement safe water in the arsenic affected area.

Specification

Source	Rain water
Collection source	Roof of house
Collection rate	0.8ltrs/m2/year incl.evaporation
Using period	6 months
Cost of PVC/rn	Tk. 100.00
Water collection jar	Ferro-cement jar
Cost of jar: Capacity: l000ltrs. capacity:2500ltrs Capacity:3000ltrs	Tk. 1200.O0 Tk. 2500.00 Tk. 3300.00
Maintenance cost	Tk. 200max

4. Pond sand filter:

UNICEF along with DPHE has been promoting this system since eighties. OXFAM group has been carrying out water sampling from the PSF water in Pathorghata. Most of the sample result showed acceptable level of e.coli and turbidity. However, water surveillance and hygiene practice is very important to endure its safety.

Specification

Source	surface water
collection source	pond/lake
using period	year round
Length	2.18 m
Width	1.58 m
height/depth	1.35 m (clear)
main component	pre filter chamber filter chamber storage chamber filter media tabe-welI deljvery line
filter media		tunnel/PVC filter 3OOmmkhoa 450mm sand coconut fiber
delivery rate		0.1 ltr/sec.
construction cost		Tk. 25000.00
maintenance cost		Tk. 600.OO max

5. Pitcher filter:

Traditional filter has been in use in the rural areas to clean pond or ring-well water when physical cleaning required. This has not been technically tested but it is believed that the pitcher filter can clean more than 90% of the suspended solids and irons and at some extent limited pathogens. This system requires further investigation and may need development before reintroduced or promoted.

Specification

Source	surface water
collection source	well/pond
using period	as and when required
Pitcher	l5 ltrs capacity
filter media	khoa sand charcoal
dripping rate	7 ltrs/hr
material cost	Tk. 300.00
construction time	2 days
maintenance cost	Tk. 100.OO max/year

6. Household mini sand filter:

This mini filter has been based on Oxfam’s principal of slow sand filter with modified flow rate, which has been tested in the Teknaf Refugee camp. Trial performance showed acceptable physical and bacteriological cleaning on specific raw water quality e.g. less dirty and less polluted water.

Specification

Source	surface water
collection source	pond/lake/well
using period	as and when required
plastic barrel	200 ltrs capacity
filter media	PVC filter O.30 m depth khoa 0.60 m depth sand synthetic fabrics
material cost	Tk. 1500.00
construction time	2 to 4 days
maintenance cost	Tk.200.O0 max/year

<< Safe Water Options (Page 1)