Rainwater Availability and Household Water Consumption for Mayne Island Report

Extracted text (beginning)

RAINWATER AVAILABILITY AND  
HOUSEHOLD WATER CONSUMPTION 
FOR MAYNE ISLAND 
 
 
for: 
 
Gerry Hamblin 
The Islands Trust 
 
 
by: 
 
Ken Hughes-Adams, M.Eng.,P.Eng. 
Madrone Environmental Services Ltd. 
 
and 
 
Bob Burgess 
Gulf Islands Rainwater Connection Ltd. 
 
 
October 30, 2006 Dossier 06.0122 
MADRONE
envi ronmental  services  ltd.

TABLE OF CONTENTS 
1.0 INTRODUCTION .................................................................................... 1 
2.0 RAINWATER AVAILABILITY ................................................................... 2 
 
2.1 Methodology............................................................................................ 2 
2.2 Recent Climatic Conditions ..................................................................... 3 
2.2.1 Spatial Trends in Precipitation ....................................................... 5 
2.2.2 Extreme Dry Conditions ................................................................. 7 
 
2.3 Future Climatic Conditions ...................................................................... 8 
3.0 HOUSEHOLD WATER CONSUMPTION .............................................. 11 
 
3.1 Methodology.......................................................................................... 11 
3.2 Estimated 2005 Residential Household Water Use ................................ 12 
3.3 Seasonal Variations in Residential Water Use........................................ 14 
3.4 Non-potable Water Use ......................................................................... 15 
3.5 Factors Influencing Future Water Consumption .................................... 17 
 
3.5.1 Population Growth....................................................................... 17 
3.5.2 Changes in Household Occupancy (full vs. part-time).................. 18 
3.5.3 Changes in Household Size and Composition .............................. 19 
3.5.4 Water Conservation Attitudes and Practices................................ 20 
 
3.6 Preliminary Estimates of Future Water Consumption ............................ 23 
 
 

 
Dossier 06.0122 
MADRONE
envi ronmental  services  ltd.
 
 
 
 
 
Rainwater Availability and  
Household Water Consumption  
for Mayne Island 
 
 
 
 
1.0 INTRODUCTION 
Water supply on the Gulf Islands is an increasingly scarce resource. Accelerating 
growth  and  development,  depletion  of  aquifers,  and  change  in  precipitation  
regimes  with  climate  change  contribute  to  an  uncertainty  in  the  viability  of  the  
Islands’ future water supply. The Islands Trust retained Madrone Environmental 
Services Ltd. (Madrone) to conduct this case study into rainwater availability and 
patterns of household consumption on Mayne Island. The information from this 
study will assist in formulating planning policies that to encourage or regulate the 
adoption of water conservation (demand management), rainwater augmentation, 
or other water supply measures for different islands and region

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