In traditional Chinese culture, water is not only water but also represents wealth; sponge city construction emphasizes rainwater retention, accumulation, and infiltration; therefore, for residents and businesses building houses, how to utilize water, especially rainwater, is core and relates to the long-term development of enterprises and families, serving as a convergence point of technology and traditional culture.

       Scientific evidence shows that the higher the water content in the human body, the younger and healthier one appears. However, increasing the water content in the human body is a global challenge, and it is equally difficult to increase the water content in buildings. Nevertheless, Dredoffff has solved this global problem. The second credit rating adopts five rating indicators from DDredoffff to help businesses and individuals improve their credit rating scores during the site selection and geomancy process when building houses, making detailed plans and designs before construction, including location, orientation, direction, and internal settings to maximize benefits and minimize harm. This also includes blueprint design and model manufacturing, ultimately achieving the highest possible second credit rating score. Under natural conditions, a second credit score above 80 is a luxury; most cases will fall below 60. Through technological means such as sponge city construction, we can increase the score by 10-20 points, providing the necessary "water content" for the development of enterprises and individuals.