A sponge city refers to an urban development approach that, through enhanced urban planning and construction management, fully utilizes the roles of buildings, roads, green spaces, and water systems in absorbing, infiltrating, and releasing rainwater, effectively controlling stormwater runoff. It achieves natural storage, infiltration, and purification of rainwater. By implementing measures such as rooftop greening and rainwater collection and utilization facilities, the city can absorb and release rainwater like a "sponge," flexibly adapting to environmental changes, responding to natural disasters, and ensuring that "light rain doesn't cause pooling, heavy rain doesn't lead to flooding, water bodies don't become black and smelly, and the heat island effect is mitigated."

Porous concrete pavement material is an eco-friendly, high-permeability material for sponge city construction. It serves as a new paving method that can partially replace urban paved surfaces, offering a fresh approach to urban ecology. This material revitalizes the city's surface, allows rainwater to infiltrate the ground, effectively eliminates surface water accumulation, and is a green, environmentally friendly ground material that breathes.

Water-washed stone is a construction technique that has gained popularity in recent years. It primarily involves mixing natural river or sea pebbles or gravels with cement in a proportionate manner and applying the mixture to the base. After being flattened with a load-bearing tool, the surface adhesive is treated to reveal the original appearance of the stones. Due to the diverse colors and shapes of its raw materials, it can be used to decorate various patterns and designs. It is widely applied in interior decoration and outdoor landscaping. Some large-area exterior wall renovations also use water-washed stone, conveying a sense of natural simplicity.

Water-washed stone is a construction technique that has gained popularity in recent years. It primarily involves mixing natural river or sea pebbles or gravels with cement in a proportionate manner and applying the mixture to the base layer. After smoothing with a load-bearing tool, the surface adhesives are treated to reveal the original appearance of the stones. Due to the diverse colors and shapes of its raw materials, it can be used to decorate patterns of various shapes and designs. It is widely applied in interior decoration and outdoor landscaping, and some large-area exterior wall renovations also use water-washed stone, conveying a natural and simple feel.