To design a streambed with concrete, one should first plan the shape and layout of the streambed to mimic a natural stream. Next, prepare the area by excavating the site and creating a stable base. Then, line the streambed with a geotextile fabric to prevent erosion and add a layer of concrete to form the desired shape. Finally, finish the streambed by adding rocks, boulders, and plants to create a more natural look and provide habitat for wildlife. **

To design a stream bed with concrete, you can start by creating a form or mold in the desired shape and size of the stream bed. Next, pour the concrete mixture into the form, making sure to smooth and level the surface. You can also add texture or patterns to the concrete to mimic the natural look of a stream bed. Once the concrete has set and cured, you can remove the form and place the concrete stream bed in its desired location, ensuring proper drainage and flow for water. **

To apply concrete on concrete, the existing surface must be clean, free of debris, and properly moistened. A bonding agent or primer should be applied to the existing concrete to ensure adhesion. The fresh concrete mix can then be poured or pumped onto the existing surface and spread evenly using a screed or trowel. It is important to properly cure the new concrete to prevent cracking and ensure a strong bond between the two layers. **

Yes, it is possible to pour new concrete over old concrete as long as the existing concrete is in good condition and properly prepared. The old concrete should be clean, free of any loose debris, and roughened to provide a good bonding surface for the new concrete. Additionally, a bonding agent may be used to ensure a strong bond between the old and new concrete. It is important to consult with a professional to assess the condition of the existing concrete and determine the best approach for pouring new concrete over it. **

For setting lawn edging stones, garden concrete would be the better option. Garden concrete is specifically designed for outdoor use and is more durable and weather-resistant than concrete screed. It also has better adhesion properties, making it more suitable for securing the edging stones in place. Additionally, garden concrete is often formulated to be more resistant to cracking and shifting, which is important for maintaining the integrity of the lawn edging. **

To cast figures in a concrete style from plaster, you will need to first create a mold of the figure using a flexible material like silicone. Once the mold is ready, mix plaster with water according to the manufacturer's instructions and pour it into the mold. Allow the plaster to set and cure completely before carefully removing the figure from the mold. To achieve a concrete look, you can paint the plaster figure with a mixture of gray paint and water, or use a concrete finish spray to give it a textured appearance. **

It is unclear whether the concrete ring was poured with the wrong concrete based on the information provided. The concrete ring may have been poured with the wrong concrete mix if it did not meet the required specifications or if it resulted in structural issues. Further investigation or clarification from the relevant parties would be needed to determine if the wrong concrete was used for the project. **

It is unclear whether the concrete belt was poured with the wrong concrete based on the information provided. To determine if the wrong concrete was used, further investigation would be needed to compare the specifications of the concrete used with the requirements for the project. Factors such as strength, composition, and curing methods would need to be considered to determine if the concrete used was indeed incorrect. **