ᐅ Evaporation Ponds on Property – How to Construct? What to Consider?
Created on: 1 Aug 2023 14:53
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Nordlichter
Hello,
we are considering buying a plot of land where the development plan requires the installation of an evaporation basin (with overflow into the parcel ditch next to the property). For every 100 m2 (1,076 sq ft) of impervious surface, at least 19 m2 (204 sq ft) of evaporation basin must be provided.
Searching online has not really helped us understand how to construct an evaporation basin on a private property and what needs to be considered.
We have sent an inquiry to the building authority to clarify questions about the depth, permitted materials, and exact size (for example, whether no basin is required under 100 m2 (1,076 sq ft) of impervious surface, or if at 101 m2 (1,089 sq ft) it must be 38 m2 (409 sq ft), or if it is calculated proportionally). However, maybe someone here can help us get a better idea of how to build an evaporation basin.
Thank you very much for any responses and assistance!
Best regards,
Kerstin
we are considering buying a plot of land where the development plan requires the installation of an evaporation basin (with overflow into the parcel ditch next to the property). For every 100 m2 (1,076 sq ft) of impervious surface, at least 19 m2 (204 sq ft) of evaporation basin must be provided.
Searching online has not really helped us understand how to construct an evaporation basin on a private property and what needs to be considered.
We have sent an inquiry to the building authority to clarify questions about the depth, permitted materials, and exact size (for example, whether no basin is required under 100 m2 (1,076 sq ft) of impervious surface, or if at 101 m2 (1,089 sq ft) it must be 38 m2 (409 sq ft), or if it is calculated proportionally). However, maybe someone here can help us get a better idea of how to build an evaporation basin.
Thank you very much for any responses and assistance!
Best regards,
Kerstin
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xMisterDx1 Aug 2023 22:46Sometimes you can understand the frustration of some officials. The development plan specifies evaporation basins, and then 100 people call asking if a rainwater tank (cistern) would also be acceptable... or a soakaway.
Probably, the infiltration conditions in your building area are poor, and you get a relatively high amount of rain annually?
A 19m² basin with a depth of 1m (3ft) stores 19m³ (670ft³)... you first have to be able to dig in a cistern that size, and it doesn’t come cheap either...
Probably, the infiltration conditions in your building area are poor, and you get a relatively high amount of rain annually?
A 19m² basin with a depth of 1m (3ft) stores 19m³ (670ft³)... you first have to be able to dig in a cistern that size, and it doesn’t come cheap either...
If you have space for a 19m² (205 sq ft) pond, you can also fit a 19m² (205 sq ft) cistern underground. Usually, too little water flows into the sewer system. That’s why retention cisterns are used to slowly release heavy rainwater, while the remaining water stays usable. The safety of such reservoirs also needs to be ensured. I’m just imagining an entire area full of ponds that aren’t filtered… perfect breeding grounds for mosquitoes.
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WilderSueden1 Aug 2023 23:05Include practical requirements in the development plan to avoid unnecessary questions. Infiltration makes sense, as it reduces stress on the sewage system and benefits groundwater. But evaporation? Poor infiltration is unlikely to be an issue with sandy soil. And any kind of pond is a prime hazard for animals... or small children.
I tried to do some research, and it seems that ponds for firefighting water are often labeled as evaporation basins. Additionally, natural-style ponds are sometimes part of environmental compensation measures. Some areas include combined infiltration and evaporation basins. But I haven’t found any solid justification for evaporation as the main purpose, other than the desire to avoid sending water to the sewer. That could be achieved through infiltration as well. Yet requiring a 30-40 m² (320-430 sq ft) pond on every property? That feels more like excessive bureaucracy and fits into outright absurdity.
@Nordlichter is the development plan available online? If so, could you please share its name (without a link)?
I tried to do some research, and it seems that ponds for firefighting water are often labeled as evaporation basins. Additionally, natural-style ponds are sometimes part of environmental compensation measures. Some areas include combined infiltration and evaporation basins. But I haven’t found any solid justification for evaporation as the main purpose, other than the desire to avoid sending water to the sewer. That could be achieved through infiltration as well. Yet requiring a 30-40 m² (320-430 sq ft) pond on every property? That feels more like excessive bureaucracy and fits into outright absurdity.
@Nordlichter is the development plan available online? If so, could you please share its name (without a link)?
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Nordlichter2 Aug 2023 20:21Hello! Thank you for your replies and your input! Great forum!
We would really love to have a cistern 🙂
The development plan should be available under "Braderup B-14 (Goldland)".
We would really love to have a cistern 🙂
The development plan should be available under "Braderup B-14 (Goldland)".
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WilderSueden2 Aug 2023 21:51The problem with infiltration is the high groundwater level; otherwise, there isn’t much issue. In this case, I would consider choosing one of the plots without the evaporation pond.
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