rainpond

plural rainponds

1. A pond which is fed by rain, such as a dewpond.

   ...small artificial rainponds made on the downs for the watering of cattle.

   1918, The Archaeological Journal, page 210

   1 more example

   ... rainponds and small dams within a radius of fifty miles of Meru at altitudes of 4000 feet upwards. Unlike most Ducks it exhibits no preference between saline and fresh waters. At Ngiroin, a small group of rainponds about ten acres in[…]

   1946, The Ibis