What is the maximum allowed ETAF of SLA according to the guidelines?

The maximum allowed Evapotranspiration Adjustment Factor (ETAF) for Special Landscape Areas (SLA) according to California guidelines is set at 1.0. This figure indicates that for these specific areas, which may include high-water use plants or unique landscape designs, the irrigation efficiency must be such that the water applied does not exceed the estimated evaporation and transpiration needs of those plants in order to promote water conservation.

Setting the ETAF for SLAs at 1.0 underscores the intent to encourage responsible water usage and management within landscapes that require a greater amount of irrigation. It signifies the importance of designing landscapes that are sustainable, particularly in a state known for its recurring droughts and water limitations. This restriction not only helps in minimizing water waste but also aligns with broader environmental goals in landscape architecture—making sure that landscapes, even in a special category, adhere to water conservation principles.