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开發地下水源时,为了找到好的井址,以便多出水量,必須事先測定当地地下水的流向和流速。一般推断地下水流向需要測量許多鑽孔或井眼的地下水位,繪成地下水位等高线,然后按流向与等高线成直角的規律進行推断。对于局部地区也有用三点法來定流向的。至于测定流速不論使用哪种指示剂,都要有已經知道地下水流向的兩个鑽孔或井眼。在上坡井投入指示剂,从下坡井采水化驗,根据时間、距离來求流速。
When developing groundwater sources, in order to find a good site for more water, the flow and velocity of local groundwater must be determined in advance. It is generally inferred that the flow of groundwater requires the measurement of the groundwater level in many boreholes or boreholes, the contour of the groundwater level, and the inference of the flow at a right angle to the contour. For some areas also useful three-point method to determine the direction of. As for the flow rate determination, no matter which indicator is used, there must be two boreholes or boreholes that already know the groundwater flow direction. In the uphill well into the indicator, from downhill wells water testing, according to the time and distance to seek velocity.