Manual and high-frequency measurements (n = 535) of chloride (Cl⁻) along a low-order stream in an urban–agricultural watershed (8% urban, 87% agriculture) were conducted to investigate the importance of stormflow to Cl⁻ transport. Sampling was conducted from February 2018 to February 2019; manual sampling occurred weekly, while stormflows were sampled at high frequency. Total Cl⁻ export was nearly 780,000 kg, of which 42.1% occurred during winter. Stormflows, which represented 19% of the period, contributed 57.6% of the total Cl⁻ load. The importance of stormflows varied seasonally; winter and spring storms exported nearly half of total Cl⁻, 29.1% and 18.2% respectively, while summer (8.2%) and fall storm (2.1%) events account for only ~ 10% of total export. A substantial portion of Cl⁻ export, 43.4%, also occurred during baseflow, likely from accumulation of Cl⁻ related to road salt and KCl fertilizer in groundwater. The results identified two periods of elevated Cl⁻ concentrations: (1) flushing of road salt from impervious surfaces during and immediately following the cold season and (2) transport of salt accumulated from the dry season. Elevated discharges associated with summer and fall stormflows when road salt was not present did not generate similar Cl⁻ loads, despite peak discharge values larger than those measured in the winter and spring. The lack of deicing application and a shift to stored Cl⁻ during the summer stormflows created a discharge–load relationship that reached an asymptote where further increases in discharge do not correspond with increased Cl⁻ load.

沿城市农业流域（8% 城市，87% 农业）的低阶河流进行了手动和高频测量（n  = 535）氯化物（Cl ^-），以研究风暴流对 Cl ^-运输的重要性. 抽样时间为2018年2月至2019年2月；每周进行一次手动采样，而暴雨流采样频率很高。Cl ^-总出口量近 780,000 公斤，其中 42.1% 发生在冬季。风暴流占该时期的 19%，占总 Cl ^-负载的57.6% 。风暴流的重要性随季节变化；冬季和春季风暴出口了近一半的氯^-、29.1% 和 18.2%，而夏季 (8.2%) 和秋季风暴 (2.1%) 事件仅占总出口的约 10%。Cl ^-出口的很大一部分，43.4%，也发生在基流期间，可能是由于与地下水中的道路盐和 KCl 肥料有关的 Cl ^-积累。结果确定了两个 Cl ^-浓度升高的时期：（1）在寒冷季节期间和紧随其后从不透水表面冲刷道路盐分和（2）从旱季积累的盐分的运输。当不存在道路盐分时，与夏季和秋季风暴流相关的高排放不会产生类似的 Cl ^-负荷，尽管峰值流量值大于冬季和春季测得的值。在夏季暴雨流期间缺乏除冰应用和转移到存储的 Cl ^-产生了一种排放-负荷关系，达到渐近线，其中排放量的进一步增加与增加的 Cl ^-负荷不相符。