I now need some help from the house building forum!
We are planning rainwater harvesting for our new build, ideally for the toilets, washing machine, and garden irrigation. Unfortunately, we have a challenging sloped plot and a very shallow rainwater sewer connection (about 1.10m (3.6 ft) below street level).
We are planning a 6000-liter (1585-gallon) concrete cistern. The domestic water system pump will be installed in the utility room on the ground floor.
- Does the suction line to the domestic water system pump (Wilo) need to have a continuous upward slope?
- How deep should the suction line and inlet be buried? From which depth is the frost-free zone?
- What is the minimum slope required for the (emergency) overflow from the cistern to the rainwater sewer?
- Does the overflow have to drain into the rainwater sewer? ... Our wastewater connection is lower.
- How can backflow into the house be prevented if the rainwater sewer is overloaded? Is a pressure-tight seal (Doyma) the only solution?
Thanks in advance for your answers and help!
Greetings from the Rhineland
We are planning rainwater harvesting for our new build, ideally for the toilets, washing machine, and garden irrigation. Unfortunately, we have a challenging sloped plot and a very shallow rainwater sewer connection (about 1.10m (3.6 ft) below street level).
We are planning a 6000-liter (1585-gallon) concrete cistern. The domestic water system pump will be installed in the utility room on the ground floor.
- Does the suction line to the domestic water system pump (Wilo) need to have a continuous upward slope?
- How deep should the suction line and inlet be buried? From which depth is the frost-free zone?
- What is the minimum slope required for the (emergency) overflow from the cistern to the rainwater sewer?
- Does the overflow have to drain into the rainwater sewer? ... Our wastewater connection is lower.
- How can backflow into the house be prevented if the rainwater sewer is overloaded? Is a pressure-tight seal (Doyma) the only solution?
Thanks in advance for your answers and help!
Greetings from the Rhineland
B
Bauexperte16 Jun 2011 13:25Hello,
Based on feedback from our homeowners, you should reconsider using rainwater for the washing machine; everyone unanimously reports early graying of laundry and, besides spending a significant amount of money on the system itself, they also had to invest in additional measures to prevent this issue. Whether operating the toilets with rainwater is worth the effort compared to the costs is something you have to assess yourself; there are definitely more cost-effective options available for garden irrigation.
For the system itself, you will likely need to have a hydrogeological report prepared—approximately €600.00—which will provide you with all the necessary parameters for construction.
Kind regards
datjabi schrieb:
We are planning to use rainwater in our new build, ideally for the toilets, washing machine, and garden irrigation.
Based on feedback from our homeowners, you should reconsider using rainwater for the washing machine; everyone unanimously reports early graying of laundry and, besides spending a significant amount of money on the system itself, they also had to invest in additional measures to prevent this issue. Whether operating the toilets with rainwater is worth the effort compared to the costs is something you have to assess yourself; there are definitely more cost-effective options available for garden irrigation.
For the system itself, you will likely need to have a hydrogeological report prepared—approximately €600.00—which will provide you with all the necessary parameters for construction.
Kind regards
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