Summer is coming, and rainwater is inevitable. Farmers with greenhouses are very worried about the drainage problem of multi span greenhouses. In the near future, there will be frequent rainfall, and many areas will face challenges. Multi span greenhouses are not enclosed. So, how should multi span greenhouses be drained on rainy days?

The roofs of multi span connected greenhouses are divided into circular arch and pointed arch types. The water on the roof will flow downstream to the gutter, so we just need to make a good slope in the direction of the gutter. Generally speaking, the slope in the direction of the sink is about 2.5 ‰, and the slope in the direction of a 4-meter bay is about 1cm. Greenhouse slopes are divided into one-way slopes and two-way slopes. If the distance in the direction of the greenhouse is greater than 40 meters, a two-way slope is generally used. The water tank is high in the middle and low on both sides, with water flowing to both sides. If the distance in the direction of the greenhouse is less than 40 meters, one side of the drainage can be used, that is, one side of the sink is blocked and only the other side is drained.

The other is that the distance in the gutter direction is too long, and the drainage on both sides cannot meet the drainage index of rainstorm, so it is necessary to add an internal drainage channel in the middle of the sink. Choose the middle position and open an opening at the bottom of the sink to allow rainwater to flow into the greenhouse.

The roofs of multi span connected greenhouses are divided into circular arch and pointed arch types. The water on the roof will flow downstream to the gutter, so we just need to make a good slope in the direction of the gutter. Generally speaking, the slope in the direction of the sink is about 2.5 ‰, and the slope in the direction of a 4-meter bay is about 1cm. Greenhouse slopes are divided into one-way slopes and two-way slopes. If the distance in the direction of the greenhouse is greater than 40 meters, a two-way slope is generally used. The water tank is high in the middle and low on both sides, with water flowing to both sides. If the distance in the direction of the greenhouse is less than 40 meters, one side of the drainage can be used, that is, one side of the sink is blocked and only the other side is drained.

The other is that the distance in the gutter direction is too long, and the drainage on both sides cannot meet the drainage index of rainstorm, so it is necessary to add an internal drainage channel in the middle of the sink. Choose the middle position and open an opening at the bottom of the sink to allow rainwater to flow into the greenhouse.

With the arrival of the rainy season, the drainage of multi span greenhouses is very important. You can use the above methods to avoid the phenomenon of greenhouse waterlogging!

To reduce water droplets on greenhouse films, the following measures can be taken:

(1) The use of drip free film in multi span greenhouses can allow water droplets to flow into the underground on both sides of the greenhouse surface.

(2) Using plastic film covering to reduce relative humidity in the air and minimize the occurrence of water loss.

(3) New films are prone to attaching water droplets. If the film is laid on a shelf or ground to dry for a few days before use, and then the sunny side is officially covered on the greenhouse or greenhouse frame, it can reduce the condensation of water droplets.

(4) If there are too many droplets on the already covered film, a cloth dipped in soybean powder can be used to wipe it. This can significantly reduce the amount of droplets. You can also use a rag dipped in soybean milk to wipe the film when the fog drops on the surface of the film have dissipated