| Clue | Source | Date |
|---|---|---|
| Quite strict in, thus, returning water-storage vessels (8) | ||
| Tanks and fliers coming under ex-Soviet grouping | ||
| They can hold water | The Washington Post Sunday | 11 Nov 2018 |
| Rain storage tanks | Eugene Sheffer | 24 Oct 2017 |
| 101 rear ends? | New York Times | 12 Sep 2017 |
| 101 rear ends? | ||
| Artificial reservoirs | Universal | 26 Jul 2016 |
| Artificial reservoirs | ||
| Reservoirs | ||
| Some reservoirs | ||
| Some reservoirs | ||
| Tanks for rain water | ||
| Water tanks | ||
| Rain collectors | ||
| Artificial reservoirs | ||
| Rain water storage tanks. |