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31. Farming More intensive agriculture has led to increased concentrations of nitrate in groundwater in many areas.

32. Leaking oil and spilled water around the wellhead percolates through to the groundwater, carrying pollutants.

33. This studied the economics of reducing groundwater pollution in ten catchments overlying chalk, sand or limestone aquifers.

34. We were able to pump clean groundwater from several of the wells.

35. Bioremediation is formally defined as the controlled use of biodegradation to remove toxic chemicals from soil and groundwater.

36. Industrial chemicals such as volatile organochlorine compounds can also find their way into groundwater, with serious implications for its quality.

36. Sentencedict.com try its best to gather and build good sentences.

37. If we drill a borehole into the aquifer the groundwater will be under sufficient pressure to overflow from the borehole.

38. But last month the issuance of groundwater discharge permits was frozen in this state.

39. And this may be the greatest threat to our reserves of groundwater.

40. Groundwater in a confined aquifer is compressed elastically, rather like air in a tyre.

41. Groundwater system is an intricate and stochastic system.

42. Nitrobenzene can rapidly deteriorate the quality of groundwater.

43. The groundwater is only feet beneath the city streets.

44. Pond formation history, groundwater flow-through ponds, phosphorous contamination.

45. Water resources management, surface and groundwater hydrology.

46. Grass-fed beef Feedlot waste piles up and ruins groundwater.

47. Dilution of groundwater falls behind of soil desalinization.

48. So the gas Rn in groundwater, which is a new observation item of earthquake precursors in groundwater, has an expansively developing prospects.

49. Bury waste and toxins in landfills, and they seep into groundwater.

50. Apparent ages of groundwater are calculated by the input function of CFCs.

51. Building warping dams will increase drinking water for people and livestock, ecological use, evaporation loss, groundwater recharge and water for dammed land.

52. If the water-tight stratum had already existed, what the groundwater pressure distribution regular in it.

53. More than a century of groundwater over-exploitation in Vietnam has drawn the water table down and, with it, arsenic.

54. "Other key factors are land subsidence caused by human activities, including over-exploitation of groundwater and massive construction of high buildings in coastal areas, " Liu said.

55. The main factors, which lead to hill landslide, are following: human engineering activities, corrosion of flowing water, change of groundwater and concentrated rainfall.

56. The flowing groundwater in coal measure can affect the coalbed gas content largely.

57. In order to satisfy the balance of groundwater in many years, a punitive factor is introduced in recursion equation.

58. By using the above obtaining conclusion, inconvertibility, nonstationarity and multiformity of result in evolution process for groundwater system of mining area were expanded on.

59. These include constructing small reservoirs and using groundwater systems sustainably, including artificial groundwater recharge and rainwater harvesting for smallholder vegetable gardens.

60. The paper analyzed the difference and the error of trans-mechanism of moisture between the lysimeter and the natural unconfined groundwater system.