使用水性颗粒物、浊度和温度来表征地表水对冲积河谷中建造的集水井的影响。在收集井的水中未发现昆虫、其他微生物、贾第虫或其他大直径病原体，尽管在邻近河流中检测到贾第虫。集水井产生的水的浊度全年几乎保持不变，并且不会随着河流浊度的变化而波动。这些结果支持了地表水对集水井的影响不应被描述为“直接”的结论然而，温度数据表明，集水井受到地表水的影响，但这些数据本身不足以决定这种影响是否是直接的。 包括7个参考文献、表格、图表。

Waterborne particulates, turbidity, and temperature were used to characterize the influence of surface water on collector wells constructed in alluvial river valleys. No insects, other microorganisms, Giardia, or other large-diameter pathogens were found in water from the collector wells, although Giardia were detected in adjacent rivers. The turbidity of the water produced by the collector wells remained virtually constant throughout the year and did not fluctuate with changes in river turbidity. These results support the conclusion that the influence of surface water on collector wells should not be characterized as "direct." Temperature data, however, show that the collector wells are influenced by the surface water, but these data alone are insufficient for deciding whether this influence is direct. Includes 7 references, tables, figures.