Analysis of rainwater and collection - Original Design
Lake Bennett Average Rainfall Intensity: 366 mm / hour
Lake Bennett Average Annual Rainfall: 160.83mm
Roof Catchment Area Of Original Design:
Guest Bedrooms: 154m2
Permanent Bedrooms: 185m2
Living Area: 205.25m2
Total Catchment Area: 544.25m2
Annual collectable water = Catchment area x Average annual rainfall
Annual collectable water = 875,320L
Water consumption / year = No. People x Daily consumption x 365
Water Consumption / Year = 8 x 166 x 365 = 484,720L
Shear line Gutter on each roof connected to two 100x75 box gutters to service 20m2 of roofing each
26,000L tank under living area of dimensions 3800 d x 3000 h
Lake Bennett Average Annual Rainfall: 160.83mm
Roof Catchment Area Of Original Design:
Guest Bedrooms: 154m2
Permanent Bedrooms: 185m2
Living Area: 205.25m2
Total Catchment Area: 544.25m2
Annual collectable water = Catchment area x Average annual rainfall
Annual collectable water = 875,320L
Water consumption / year = No. People x Daily consumption x 365
Water Consumption / Year = 8 x 166 x 365 = 484,720L
Shear line Gutter on each roof connected to two 100x75 box gutters to service 20m2 of roofing each
26,000L tank under living area of dimensions 3800 d x 3000 h
The main issue with the original design is that the roof catchment area is excessively large, being able to catch more than twice as much rain water than necessary for a years worth of usage. This means that more water than the tank is capable of storing will be filtered into the tank during the monsoon season leading to overflowing and flooding underneath the kitchen area. This can lead to erosion of the footings as the soil is highly erosive in this area.
Analysis of rainwater and collection - Refine Design
Area A = 5.5 x8.4 x 3.14 = 145.14m2
Area B = (7.3 x 4.5 x 3.14) x 0.6 = 61.92m2
Area C = (6.1 x 3.3 x 3.14) x 0.45 = 28.54m2
Total Roof Catchment Area = 235.6m2
Lake Bennett Average Annual Rainfall: 160.83mm
Annual collectable water = Catchment area x Average annual rainfall
Annual collectable water = 378,915L
Area B = (7.3 x 4.5 x 3.14) x 0.6 = 61.92m2
Area C = (6.1 x 3.3 x 3.14) x 0.45 = 28.54m2
Total Roof Catchment Area = 235.6m2
Lake Bennett Average Annual Rainfall: 160.83mm
Annual collectable water = Catchment area x Average annual rainfall
Annual collectable water = 378,915L
The rainwater is collected off the membrane roof in six locations at the base of the bamboo structure.
The collected water is channeled into a 45,500L tank of dimensions 3420mm high and 4400mm deep.
This tank is located underneath the kitchen decking and is semi submerged into the ground to maintain a stable temperature.
A spoon drain surrounds the structure on the west to stop erosion of the footings during the wet season.
Water consumption / year = No. People x Daily consumption x 365
Water Consumption / Year = 8 x 118 x 365 = 344,560L
The refined design has a smaller roof catchment area which means both the ability to catch less water than the original, but also the optimum amount of water to survive for the entire year off the grid is being caught. Furthermore a larger tank has been added so that during the dry season there can be enough water stored to survive. The spoon drain still surrounds the structure on the west side to prevent water runoff from the hill being trapped under the building.
The collected water is channeled into a 45,500L tank of dimensions 3420mm high and 4400mm deep.
This tank is located underneath the kitchen decking and is semi submerged into the ground to maintain a stable temperature.
A spoon drain surrounds the structure on the west to stop erosion of the footings during the wet season.
Water consumption / year = No. People x Daily consumption x 365
Water Consumption / Year = 8 x 118 x 365 = 344,560L
The refined design has a smaller roof catchment area which means both the ability to catch less water than the original, but also the optimum amount of water to survive for the entire year off the grid is being caught. Furthermore a larger tank has been added so that during the dry season there can be enough water stored to survive. The spoon drain still surrounds the structure on the west side to prevent water runoff from the hill being trapped under the building.
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