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APPROPRIATE LAW COST TECHNIQUES IN RURAL WATER SUPPLY SCHEMES. H,M.GUNAPALA(E/A) RWS-Unit Monaragala MAHINDA DISSANAYAKE RWS-Unit Badulla. Why we need Law cost techniques ?. To minimized the overall cost in rural water supply scheme’s. What are the law cost techniques.
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APPROPRIATE LAW COST TECHNIQUES IN RURAL WATER SUPPLY SCHEMES H,M.GUNAPALA(E/A) RWS-Unit Monaragala MAHINDA DISSANAYAKE RWS-Unit Badulla
Why we need Law cost techniques ? • To minimized the overall cost in rural water supply scheme’s
What are the law cost techniques FERROCEMENT TECHNIQUES COULD BE BEST OPTION • Ferrocement Ground reservoir's • Ferrocement elevated Tanks • Ferrocement roughing filter’s • Ferrocement Slow sand filter’s
Other techniques • Plastic shell roughing filter’s • Plastic shell rainwater harvesting tank NEXT
Sri Lanka chronological order • 1980 –Sarvodaya/Danida Project(capacity up to 10 - 15 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)
How To Construct Ferrocement Tank ? • Tank Base • Tank wall • Tank Dome Parts of ferocement tank NEXT
Tank Base Back
Tank wall Back
Tank Dome Back
Construction 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
Pipes arrangement (inlet,outlet &wash out pipe) not placing correct place Back
4.5 mm dia GI wire is not fixed to the wall in correct distance Back
Out 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
Comparison of ferocement tank &concrete tank(ADB 3rd project-Monaragala) • Table -01 • Table -02 NEXT
How to repair ferrocement tanks VIDEO – 01 VIDEO – 02 VIDEO – 03
Advantages of ferrocementtechnolloogy • 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
Other Application of ferrocement techniques • Intake well dome • Water pond • Patrician wall • Domestic water storage tank • Rainwater harvesting tanks • toilets • Chlorine house NEXT
Intake well dome BACK
intake well dome VIDEO BACK
Water pond BACK
Patricians wall BACK
toilets BACK