## 4 Development and Opening of Optical Fiber for the Management of Public Facilities and Its Housing Space

The development and opening of optical fiber for the public facilities management and its housing space is being promoted in rivers, roads, ports, and sewage, as a response to the “e-Japan Priority Policy Program”. As of October 2014, the total extent of the optical fiber controlled by the government for river and road management was about 37,000 km, and of this a portion of core cable roughly 18,000 km that does not interfere with the facilities management was opened to private sector business, and in 2014 there were new applications for additional use of about 300 km.

## 5 Sophisticated Water Management and Water Disaster Prevention Utilizing ICT

In light of the new developments in information technology of recent years, new technology is being applied in the field to further the sophistication of water management and water disaster prevention.

Regarding the monitoring of rivers and their basins, a new type radar, XRAIN (MLIT X Band MP Radar Network), which allows for near real-time observation of local rainfall, is being implemented for rainfall observations. For the observation of flow amount and water levels, the introduction and practical application of new technology such as the ADCP (Acoustic Doppler Current Profiler) and image analysis (Figure II-10-1-3 Diagram-1) that utilizes CCTVs among other images is being promoted. Also, to assess the extent of inundation when disasters occur, utilization of big data including the use of Synthetic Aperture Radars (SAR), postings to the Social Networking Service (SNS), and various location information are being investigated.

In addition to obtaining high precision topographic data through aerial laser profiling (LP), initiatives to improve the efficiency and effectiveness of maintenance and management by utilizing the image data obtained through Mobile Mapping Systems (MMS) are being promoted.

Further crisis management is being promoted by initiatives like flood simulation and risk understanding (Figure II-10-1-3 Diagram-3) based on “Distributed Rainfall-Runoff Model”, an advanced flood prediction model compared to the conventional one, that uses the information obtained through such rain volume, water level, and high precision topographic data.

Also, for the sediment-related disasters caused by heavy rains and other causes, unusual condition are always monitored through means such as rainfall radar that can observe the rainfall situation over a large area at high accuracy, volcano monitoring cameras, and landslide monitoring systems. Additionally, in preparation for the occurrence of deep-seated catastrophic landslide, the development of the “Deep-seated Catastrophic Landslide Monitoring and Warning

Figure II-10-1-3

Example of ICT Utilized for Sophisticated Water Management and Flood Prevention

Diagram 1 Measuring the Water Level and Flow Rate Using Image Analysis of Video Source) Fujita Lab, Kobe University Faculty of Engineering

Diagram 2 Flood prediction by distributed hydrological model Source) MLIT

Diagram 3 Deep-seated Catastrophic Landslide Monitoring and Warning System Source) MLIT