2. Recent advances of storm water management
{"Image DocumentName": "2. Recent advances of storm water management", "Image ImageDescription": "2.3 Standard, code and technical guidelines are under revised or newly released. Design standard improved. Released time. The return period of urban drainage system. 1975\u5e74 \u5e74 \u5e74 \uff0c\u91cd\u8981\u5730\u533a(important areas)2-5\u5e74. 2006\u5e74 \uff0c\u91cd\u8981\u5730\u533a(important areas) \u5e74. 1-3\u5e74\uff0c\u91cd\u8981\u5730\u533a(important areas)3-5. The 2014 version of design return period of storm drainage pipes. Central area. Suburban area. Important central area. Underground, underpass, low-lying square. Megacities. 3\uff5e5. 2\uff5e3. 5\uff5e10. 30\uff5e50. Big cities. 2\uff5e5. 20\uff5e30. Small and medium cities. 10\uff5e20.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}