Water Space under the ground“Cross-Wave” is a water holding material for rainfall accumulation installed within underground reservoirs. Certified by ARSIT, it is Japan’s new technology product.Underground water space created by Cross-Wave effectively controls flood of river and drainage caused by heavy rain. At the same time it also provides a system through which stored rain water can be used according to necessity. The reserved water can be used for all purposes such as daily life usage, industrial usage or at the time of emergency.