When is it permissible for the ends of trenches to remain straight?

In the context of sewer and drainage design, the use of a serial distribution system allows for the straight ends of trenches to be permissible. This is because a serial distribution system is designed to deliver effluent evenly across multiple trench trenches, which allows the flow of wastewater to be balanced and equalized. The straight ends help maintain uniformity in the distribution of the effluent, ensuring that it properly saturates the soil and is adequately treated before it reaches the groundwater or surface water.

In this system, efficiency is derived from the serial connection of the distribution lines, where the flow is evenly distributed without the need for additional curves or alterations at the ends of the trenches. This helps mitigate the potential for uneven distribution or pooling, which could affect the performance of the sewage treatment process.

Other systems, such as gravel distribution or pressurized systems, may have different requirements for trench design and layout, necessitating variations to optimize the functional characteristics of those systems. Thus, the straight-end design is specific to the principles underlying serial distribution systems.