31. There is an underground reservoir and a cistern said to have healing power and not to have been dry ever. 32. Markovtsev said that the city is surveying the Pushkinskaya depression, a natural underground reservoir that was discovered 20 years ago. 33. When rain falls on mountains in the West Bank, a portion seeps downhill toward Israel and into an underground reservoir . 34. Infiltration trenches are shallow excavated structures filled with permeable materials such as gravel or rock to create an underground reservoir . 35. The city's 10 million residents are short of drinking water because floodwater mixed with sewage has swamped many underground reservoirs . 36. A senior Western diplomat here said he understood that the underground reservoirs in the desert could run dry in 50 years. 37. Created over a million years ago, the layered, porous basalt retains rainwater and snow melt, which forms a large underground reservoir . 38. The work included the construction of an underground reservoir , holding of water to provide running water for the castle and village. 39. One would be as a source of new, native water for Southern California, by pumping from a previously untapped underground reservoir . 40. Underground reservoirs contain far more water than the capacity of all surface reservoirs and lakes in the US, including the Great Lakes.
