Some Common Misconceptions About Groundwater
Barney Popkin First, it’s not a question if you grind the water before you extract it or afterwards. Second, it’s not about where the ground meets the
sea. Just kidding. Here’s some common misconceptions about groundwater.
1. Groundwater’s or aquifer’s hydraulic parameters (hydrau- lic conductivity, transmissibility, storage coefficient, storativity) and conditions (saturated aquifer thickness, hydraulic gradient) are good predictors of groundwater availability. They’re not. Better predictors are safe yield, storage capacity, and saturated aquifer volume in porous media or fractured and cavernous rock.
2. Deeper groundwater is generally better-quality drinking water. Not true. Deeper water is generally older, has more contact time with minerals, and is saltier than shallow water.
3. Artesian or even flowing groundwater is better quality drinking water than otherwise. False. These flow mecha- nisms are unrelated to water quality.
4. If you double the diameter of a water well, you’ll double the well’s discharge capacity. Nonsense. You’ll only increase well yield by a few percent. If you want to double the dis- charge, you’ll likely need to double its saturated thickness.
5. You can accurately predict the water level in an aquifer any distance from a pumping well in operation for several years from hydraulic equations based on aquifer tests. Baloney; Aquifer properties are not homogeneous and isometric.
6. Aquifer tests and pumping or pump tests are the same. Bull. Aquifer tests examine the properties of the aquifer regard- ing groundwater flow. Pump tests examine the performance of pumps with regard to energy, lift, and discharge rate.
7. Seawater intrusion is readily reversible. Haha. Seawater is impossible to easily remove from drinking and irrigation water once the two are mixed.
8. Seawater intrusion only impacts a small coastal area of an aquifer. Not true. Seawater intrusion can adversely impact very large areas of drinking and irrigation water inland of seacoasts and rivers.
9. Aquifer storage capacity is fixed by nature. Fake news. Water storage may readily be increased by blasting, tunnel- ing, fracturing, excavating, and acidizing the aquifer.
10. Groundwater quality is protected from overlying surface pollution because groundwater is deep. No. Surface pol- lution from landfills, oil spills, land use, sewage, and com- mercial and industrial wastes readily contaminate drinking and irrigation groundwater.
www.aipg.org
Jul.Aug.Sep 2024 • TPG 19
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