Following are a number of back-translations as well as a sample translation for translators of Isaiah 41:18:

• Kupsabiny: “I shall make water flow from rocky hills
  and open the holes/springs of water in the valley.
  I shall make the desert become a well/pond
  and the dry land become rivers.” (Source: Kupsabiny Back Translation)
• Newari: “I will cause floods to flow from the naked hills,
  and in the valleys I will produce springs of water.
  I will [put] pools of water in the wilderness
  and I will change the dry ground into springs of water.” (Source: Newari Back Translation)
• Hiligaynon: “I will-cause- the rivers -to-flow on the barren mountains and the springs on the plains/valleys. I will-make the desert into pool-of-waters, and the dry/parched ground into springs.” (Source: Hiligaynon Back Translation)