Ed Heck蓄水池是一个圆柱形蓄水池，内径为154英尺，深度为30英尺，正常工作范围为15至27英尺。容量约为400万加仑；蓄水池由一根24英寸的管道供水，水通过一根30英寸的出水管流出。进水管从储液罐底部进入，上面有一个直角弯头。出口就在它的底部。进水的能量使水库中的水逆时针旋转。正常的日常操作是向储罐中泵送约800万加仑，因此平均滞留时间为4/8*24，即12小时。 在1994年4月的实验中，氟化物示踪剂研究表明，储层的T10时间约为25分钟。这一短时间不足以满足地表水处理规则要求的CT值。所需的T10时间估计在1到1 1/2小时之间，具体取决于温度、氯剂量、信用、储罐液位和其他参数。问题是:如何增加T10时间？为了分析这个问题，建立了两个小规模的水槽模型，并借助染料示踪剂分析了流型和滞留时间。 用摄像机和静态摄影记录了流动模式。

The Ed Heck reservoir is a cylindrical reservoir with an inside diameter of 154 feet, a depth of 30 feet and a normal operating range of 15 to 27 feet. The capacity is about 4 million gallons; the reservoir is fed by a 24 inch pipe and water exits through a 30 inch outlet pipe. The inlet pipe enters in at the bottom of the reservoir, and has a right angle elbow on it. The outlet is next to it at the bottom. The energy of the incoming water causes the water in the reservoir to rotate in a counter-clockwise direction. The normal daily operation is to pump about 8 million gallons to the tank, thus leading to an average detention time of 4/8*24, or 12 hours. During experiments in April of 1994, tracer studies with fluorides indicated that the T10 time of the reservoir is about 25 minutes. This short time is not sufficient to meet the required CT values under the Surface Water Treatment Rule. The required T10 times are estimated between 1 and 1 1/2 hours, depending on temperature, chlorine dosage, credits, tank levels, and other parameters. The question is: What can be done to increase the T10 time? To analyze this problem, two small scale models of the tank were built, and the flow patterns and detention times were analyzed with the help of a dye tracer. The flow patterns were recorded with a video camera and still photography.