一）总公式（二）单一重现期暴雨强度公式重现期 P（年）暴雨强度公式P＝2P＝3P＝5P＝10P＝20P＝30P＝50P＝100 附件南丹县城市排水防涝暴 雨 强 度 公 式 及 计 算 图 表（设 计 用 表）河池市安信达气象灾害防御技术服务中心2019年1月说 明1.本计算公式和图表是根据南丹国家气象站52年（1966～2017年）的连续自记雨量记录为基础，采用“年最大值法”对暴雨样本资料进行选样，由耿贝尔分布曲线拟合数据，得到P-i-t关系表，再由最小二乘法求解公式参数得到2.以重现期2、3、5、10、20、30、50、100（年）相应的单一重现期暴雨强度公式编制查算表（表二），设计暴雨强度可按选定设计重现期直接查用表中对应的数值（单一重现期暴雨强度公式见表一）3.若采用其它重现期，设计暴雨强度可用暴雨强度总公式计算： 式中：q—设计暴雨强度[升/（秒公顷）] i—设计暴雨强度（毫米/分钟） P—设计暴雨重现期（年） t—降雨历时（分钟）4.适用范围本计算公式和图表适用的时间范围是1～200分钟，空间范围是南丹县城区5.公式误差重现期2～20年的暴雨强度总公式算得的平均绝对均方差为0.016（mm/min），平均相对均方差为1.49%；单一重现期暴雨强度公式平均绝对方差为0.011mm/min，平均相对均方差为0.70%，精度符合《室外排水设计规范》（GB50014—2006，2016年版）的要求。
单一重现期暴雨强度公式精度明显优于暴雨强度总公式，推荐使用单一重现期暴雨强度公式表一 单一重现期暴雨强度公式重现期 P（年）暴雨强度公式P＝2P＝3P＝5P＝10P＝20P＝30P＝50P＝100 表二 暴雨强度查算表P=2a t（min） q[L/（s•hm2）]tqtqtqtqtq1427.70541171.89781112.17712184.64116168.5712410.86042169.54382111.24712284.13816268.2533395.40343167.25883110.33412383.64216367.9384381.16544165.03984109.43712483.15216467.6275368.00445162.88485108.55612582.66816567.3196355.79946160.79086107.69012682.19016667.0147344.44747158.75487106.84012781.71816766.7128333.86048156.77388106.00312881.25216866.4139323.96049154.84689105.18212980.79216966.11610314.68150152.97090104.37313080.33717065.82311305.96651151.14391103.57913179.88917165.53312297.76252149.36392102.79713279.44517265.24513290.02553147.62893102.02813379.00717364.96014282.71554145.93794101.27213478.57417464.67815275.79755144.28895100.52813578.14617564.39816269.24056142.6799699.79613677.72417664.12117263.01457141.1089799.07513777.30617763.84718257.09558139.5769898.36613876.89317863.57519251.46159138.0799997.66813976.48617963.30620246.09060136.61710096.98014076.08218063.03921240.96461135.18810196.30314175.68418162.77522236.06762133.79210295.63614275.29018262.51323231.38263132.42710394.98014374.90018362.25324226.89664131.09210494.33314474.51518461.99625222.59765129.78610593.69614574.13418561.74126218.47266128.50810693.06814673.75718661.48927214.51067127.25810792.44914773.38518761.23828210.70368126.03410891.83914873.01618860.99029207.04169124.83510991.23814972.65218960.74430203.51570123.66111090.64515072.29219060.50031200.11971122.51111190.06115171.93519160.25932196.84472121.38511289.48515271.58219260.01933193.68473120.28011388.91715371.23319359.78234190.63374119.19811488.35715470.88819459.54635187.68675118.13611587.80415570.54719559.31336184.83676117.09511687.25915670.20919659.08237182.08077116.07411786.72115769.87419758.85238179.41278115.07211886.19115869.54319858.62539176.82879114.08911985.66815969.21619958.39940174.32480113.12512085.15116068.89120058.176P=2a t（min） i（mm/min）tititititi12.561411.029810.6721210.5071610.41122.460421.015820.6661220.5041620.40932.368431.002830.6611230.5011630.40742.282440.988840.6551240.4981640.40552.204450.975850.6501250.4951650.40362.131460.963860.6451260.4921660.40172.063470.951870.6401270.4891670.39981.999480.939880.6351280.4871680.39891.940490.927890.6301290.4841690.396101.884500.916900.6251300.4811700.394111.832510.905910.6201310.4781710.392121.783520.894920.6161320.4761720.391131.737530.884930.6111330.4731730.389141.693540.874940.6061340.4711740.387151.651550.864950.6021350.4681750.386161.612560.854960.5981360.4651760.384171.575570.845970.5931370.4631770.382181.539580.836980.5891380.4601780.381191.506590.827990.5851390.4581790.379201.474600.8181000.5811400.4561800.377211.443610.8101010.5771410.4531810.376221.414620.8011020.。