APPROPRIATE LAW COST TECHNIQUES IN RURAL WATER SUPPLY SCHEMES H,M.GUNAPALA(E/A) RWS-Unit Monaragala MAHINDA DISSANAYAKE RWS-Unit Badulla
W HY WE NEED L AW COST TECHNIQUES ? To minimized the overall cost in rural water supply scheme’s
W HAT ARE THE LAW COST TECHNIQUES Ferrocement Ground reservoir's Ferrocement Ground reservoir's Ferrocement elevated Tanks Ferrocement elevated Tanks Ferrocement roughing filter’s Ferrocement roughing filter’s Ferrocement Slow sand filter’s Ferrocement Slow sand filter’s
Plastic shell roughing filter’s Plastic shell roughing filter’s Plastic shell rainwater harvesting tank Plastic shell rainwater harvesting tank NEXT
Ferrocement Ground reservoir's Back
F ERROCEMENT ELEVATED T ANKS Back
F ERROCEMENT ROUGHING FILTER ’ S Back
F ERROCEMENT S LOW SAND FILTER ’ S Back
P LASTIC SHELL ROUGHING FILTER ’ S Back
P LASTIC SHELL RAINWATER HARVESTING TANK Back
S RI L ANKA CHRONOLOGICAL ORDER 1980 –Sarvodaya/Danida Project(capacity up to Cm) 1990 – CWSSP Project (capacity up to 40 Cm) 1995-NWS&DB – Small town water supply and sanitation project (capacity up to 40 Cm) 2000-NWS&DB – ADM 3rd project (capacity up to 100 Cm)
H OW T O C ONSTRUCT F ERROCEMENT T ANK ? Tank Base Tank wall Tank Dome NEXT
T ANK B ASE Back
T ANK WALL Back
T ANK D OME Back
C ONSTRUCTION MISTAKES OCCURRED DURING CONSTRUCTION PERIOD Pipes arrangement (inlet,outlet &wash out pipe) not placing correct place Tank wall not align correctly Dome is not construct ' correct shape Wall thickness is increased than recommended thickness 4.5 mm dia GI wire not connected to base properly 4.5 mm dia GI wire is not fixed to the wall in correct distance Neglect water cement ratio Neglect quality of materials Curing is not done properly NEXT
P IPES ARRANGEMENT ( INLET, OUTLET & WASH OUT PIPE ) NOT PLACING CORRECT PLACE Back
T ANK WALL NOT ALIGN CORRECTLY Back
D OME IS NOT CONSTRUCT ' CORRECT SHAPE Back
4.5 MM DIA GI WIRE NOT CONNECTED TO BASE PROPERLY Back
4.5 MM DIA GI WIRE IS NOT FIXED TO THE WALL IN CORRECT DISTANCE Back
O UT COMES OF CONSTRUCTION MISTAKES Tank will be out of shape Water leak can be occurred Construction cost would be increased Durability of the tank would be decreased NEXT
T ANK WILL BE OUT OF SHAPE BACK
W ATER LEAK CAN BE OCCURRED BACK
C OMPARISON OF FEROCEMENT TANK & CONCRETE TANK (ADB 3 RD PROJECT -M ONARAGALA ) Table -01 Table -02 NEXT
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Description Cost for Ferro cement tank SLR Cost for concrete tank SLR Percentage reduction compared to concrete tank 30 cum ground tank % 50 cum ground tank % 30 cum elevated tank 6.8m (height) % 60 cum elevated tank 9 m (height) % BACK
VIDEO – 01 VIDEO – 02 VIDEO – 03
A DVANTAGES OF FERROCEMENT TECHNOLLOOGY Law cost for general types of constructions Simplicity in technology Not much skill labour required Required tools and equipment can be found easily Light weight and therefore easy handling Easy repairs and maintenance Adequate strength for rural development Adequate durability Protection against sunshine and flooding Easy removal
O THER A PPLICATION OF FERROCEMENT TECHNIQUES Intake well dome Water pond Patrician wall Domestic water storage tank Rainwater harvesting tanks toilets Chlorine house NEXT
I NTAKE WELL DOME BACK
INTAKE WELL DOME VIDEO BACK
W ATER POND BACK
P ATRICIANS WALL BACK
D OMESTIC WATER STORAGE TANK BACK
R AINWATER HARVESTING TANKS BACK
TOILETS BACK
O THER APPLICATION - FOREIGN COUNTRIES
Other application-foreign countries