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1 防洪标准和水文计算1.1 防洪标准的选择及校核依据根据片区的地形地貌可划分为山区及已建城区,其中山区、城建区面积分别是4.76、1.64km~2。由于城建区排洪渠均为暗渠或箱涵,不能自然汇集地面径流,只有靠城区雨水管网系统收集而后进入排洪涵渠。为了使排洪渠的设计更合理、更符合实际,设计中分别按山洪治理标准和城镇市政排水标准计算设计洪水。①治理山洪标准:按照《防洪标准》,本区域内非农业
1 Flood Prevention Standards and Hydrological Calculation 1.1 Criteria for Flood Prevention Selection and Verification Based on the topography of the area, it can be divided into mountainous areas and built urban areas, of which the area of mountainous areas and urban construction areas are 4.76 and 1.64km 2, respectively. As the drainage ditch in the urban construction area is underdrain or box culvert, ground runoff can not be brought together naturally. Only urban storm water pipe network system collects and then enters the flood drainage culvert. In order to make the design of flood discharge canal more reasonable and more realistic, the design floods are calculated according to the criteria of mountain flood control and the standard of urban drainage. ① governance torrent standards: According to “flood control standards”, the region’s non-agricultural