SCHOOL OF CIVIL

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SCHOOL OF CIVIL STRUCTURAL ENGINEERING, DIT,
BOLTON STREET, DUBLIN 1

• RAINWATER HARVESTING
• - A USEFUL TOOL IN WATER
• DEMAND MANAGEMENT
• Dr. Sean OHogain Liam McCarton
• Tel [phone] Tel [phone]
• sean.ohogain_at_dit.ie liam.mccarton_at_dit.ie

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WATER SUSTAINABILITY DEMAND

• SUSTAINABLE DEVELOPMENT
• A better quality of life for everyone, for now
  and for generations to come

• DEMAND MANAGEMENT

• WATER SUPPLIER
• Network Leakage Detection
• Treatment Optimisation
• WATER END USER
• Water Saving Technologies
• Conservation Measures
• Waste Reduction
• Alternative Supplies
• Rainwater Harvesting
• Recycling Reuse
• Greywater
• Process reuse

• QUANTITY
• Rising consumption
• Rising affluence
• Increased development
• QUALITY
• Pollution
• Water Treatment
• Wastewater treatment

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HOUSEHOLD WATER USE Per Capita Consumption
(pcc)
Typical Household Water Use

• PCC Reduction Methods
• Water Displacement Devices
• Dual Flush wcs
• Low Flow Faucets
• Water Efficient Appliances
• Rainwater Harvesting

Mains water Supply Harvested Rainwater Supply
(53)
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Potential Reduction in PCC rates by
implementation of Water Conservation Rainwater
Harvesting Systems

• DEMAND MANAGEMENT
• Predicted 2018 PCC reduced from 147.17 l/hd/d to
  82.75 l/hd/d (potential saving of 44)

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RAINWATER QUALITY

• Extensive monitoring of rainwater harvesting
  installations in Europe has concluded
• Waterborne Diseases These arise from bacteria,
  which are human and animal in source. No human
  bacteria has been found in water collected from
  roof surfaces
• Salmonella Salmonella may be present on roof
  surfaces due to the presence of birds. Tests on
  rainwater have found no trace of salmonella. This
  is due to the fact that salmonella cannot survive
  without a food source.
• E.coli Tests on harvested rainwater have shown
  E.coli present at levels of 26/100ml.
• Coliform Bacteria Tests on harvested rainwater
  have shown average values of 200/100ml

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RAINWATER QUALITY
Test Results Prof Dott, Director of the Institute
for Hygiene And Environmental Medicine,Technical
University of Aachen No hygenic risk from the
domestic use of rainwater for flushing of
toilets garden use, provided properly
engineered systems are used
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AGRICULTURAL APPLICATION
PROJECT OBJECTIVES

• TO ASSESS THE FEASIBILITY OF INCORPORATING
  RAINWATER SUPPLY TO SUPPLEMENT / REPLACE MAINS OR
  OTHER WATER SUPPLIES
• TO MONITOR THE QUALITY AND QUANTITY OF HARVESTED
  RAINWATER OVER A 24 MONTH PERIOD
• TO IDENTIFY THE CONSTRAINTS INVOLVED IN
  IMPLEMENTING RAINWATER HARVESTING SYSTEMS IN
  AGRICULTURAL SETTINGS.
• TO DEVELOP GUIDELINES FOR SUSTAINABLE WATER
  MANAGEMENT SYSTEMS FOR AGRICULTURAL INSTALLATIONS

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RURAL WATER SUPPLY
PROJECT OBJECTIVES
 

•     
• INSTALL RAINWATER HARVESTING AND WATER
  CONSERVATION DEVICES AS PART OF A PILOT PROJECT
  TO ASSESS THE REDUCTION IN DOMESTIC WATER DEMAND
• MONITOR FOR 24 MONTHS
• FLOWRATES
• WATER QUALITY
• RAINFALL
• ENERGY USEAGE
• FILTER EFFICIENCY
• DEVELOP GUIDELINES FOR SUSTAINABLE DOMESTIC
  WATER DEMAND MANAGEMENT SYSTEMS IN IRELAND

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PROJECT TASKS

• LITERATURE REVIEW
• Collate Water Efficiency Research
• Assess International Best Practice
• PILOT RAINWATER HARVESTING INSTALLATION
• Site Selection
• Water Audit
• Water Management Plan
• Installation Phase
• Install Monitoring Equipment
• OPERATION
• Public Education Campaign
• Commissioning
• Problems / Solutions
• Quick Reference Guide for Users

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PROJECT TASKS

• MONITORING
• Water Use Inventory
• Rainfall
• Flowmeters
• Energy Usage
• Water Quality
• ANALYSIS OF DATA
• Water Quality Parameters
• Review Water Conservation Measures
• Payback Periods
• REPORT PREPARATION
• Interim Reports
• Final Report
• Conferences / Journals

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SUMMARY

• Water conservation / rainwater harvesting forms
  an essential
• part of developing a Sustainable Water Management
  Policy
• Internationl experience has shown that financial
  benefits can
• accrue to both customers and providers
• Implementation of water efficiency / reuse
  technologies for rural water
• supply could prove more cost effective than
  resource development
• Pilot projects are required to address the
  current shortfall of data
• in Ireland
• Provide Technical Guidance and establish Best
  Practice Guidelines
• for both Domestic and Agricultural Water
  Conservation / Reuse Measures