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Difference between revisions of "Rainfall"
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| − | Waiheke residents depend on the rain harvesting as there is no water reticulation on the island. Water is collected off the roof and stored in tanks. These range in size but a typical modern house would have at least | + | Waiheke residents depend on the rain harvesting as there is no water reticulation on the island. Water is collected off the roof and stored in tanks. These range in size but a typical modern house would have at least one 5000 gallon (22500 litre) tanks. |
| − | NIWA and the NZ Meteorological Service have a long-term rainfall monitoring site at Awaroa on Waiheke Island. Mean annual rainfall in the Awaroa Valley | + | NIWA and the NZ Meteorological Service have a long-term rainfall monitoring site at [[Awaroa]] on Waiheke Island. Mean annual rainfall in the Awaroa Valley is approximately 1,280mm Source [http://www.arc.govt.nz/arc/library/r44147_2.pdf Auckland Water Resource Quantity Statement 2002] |
| − | 1,280mm Source [http://www.arc.govt.nz/arc/library/r44147_2.pdf Auckland Water Resource Quantity Statement 2002] | ||
| − | For every square metre of roof each millimeter of rain will | + | For every square metre of roof each millimeter of rain will deliver one litre of water into the tank. Hence with an annual rainfall of 1,280 mm and assuming a 100sqm roof an average house will expect to collect 128,000 lires of water in a year. This allows 350 litres per day. The average houshold usage in the Metrowater catchment area is 501 litres per day. Source [http://www.ourwater.co.nz/docs/submission.pdf Local Government andEnvironment Committee submission on water charges] It is believed that Waiheke water usage is as low as 100 litres per day per person. |
| − | + | The flaw in this calculation is that during winter months a lot of the collected water is lost as the tanks overflow. Many Waiheke residents have to buy in water from one the water delivery companies on the island. These companies draw bore water from the Waiheke aquifer. | |
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http://www.waihekeweather.net/Onetangi/rainyeartank.gif Rain this year http://www.waihekeweather.net/Onetangi/rainmonthtank.gif Rain this month http://www.waihekeweather.net/Onetangi/raintodaytank.gif Rain today | http://www.waihekeweather.net/Onetangi/rainyeartank.gif Rain this year http://www.waihekeweather.net/Onetangi/rainmonthtank.gif Rain this month http://www.waihekeweather.net/Onetangi/raintodaytank.gif Rain today | ||
Source Waiheke Weather Network rain gauge Onetangi | Source Waiheke Weather Network rain gauge Onetangi | ||
Revision as of 11:22, 12 September 2007
Waiheke residents depend on the rain harvesting as there is no water reticulation on the island. Water is collected off the roof and stored in tanks. These range in size but a typical modern house would have at least one 5000 gallon (22500 litre) tanks.
NIWA and the NZ Meteorological Service have a long-term rainfall monitoring site at Awaroa on Waiheke Island. Mean annual rainfall in the Awaroa Valley is approximately 1,280mm Source Auckland Water Resource Quantity Statement 2002
For every square metre of roof each millimeter of rain will deliver one litre of water into the tank. Hence with an annual rainfall of 1,280 mm and assuming a 100sqm roof an average house will expect to collect 128,000 lires of water in a year. This allows 350 litres per day. The average houshold usage in the Metrowater catchment area is 501 litres per day. Source Local Government andEnvironment Committee submission on water charges It is believed that Waiheke water usage is as low as 100 litres per day per person.
The flaw in this calculation is that during winter months a lot of the collected water is lost as the tanks overflow. Many Waiheke residents have to buy in water from one the water delivery companies on the island. These companies draw bore water from the Waiheke aquifer.
Rain this year 
Rain this month 
Rain today
Source Waiheke Weather Network rain gauge Onetangi