Which of the following is NOT a requirement of MWELO regarding irrigation system design?

The requirement to ensure high-pressure water usage is not a component of the Model Water Efficient Landscape Ordinance (MWELO) regarding irrigation system design. MWELO emphasizes water efficiency and encourages landscape designs that minimize water waste. High-pressure water systems can lead to increased evaporation and runoff, which contradicts the ordinance's intent.

In contrast, preventing runoff and low head drainage is essential to ensure that irrigation systems are designed to avoid water loss and manage water application effectively. Utilizing a soil management plan is critical for assessing the needs of the landscape and ensuring plants receive adequate moisture without over-irrigation. Additionally, conforming to hydrozones in landscape design is crucial in directing water use efficiently based on the needs of different plant types grouped according to their irrigation requirements. Each of these requirements supports the overarching goal of conserving water and improving irrigation efficiency, while the emphasis on high-pressure systems does not align with these objectives.