Near Parnasa there was a tank from which the villagers took water for drinking and washing. There were places around the tank set up for people to get at the water called rayvus where there may be a tree for shade or to hang wash on or stones laid as steps into the water. As in other villages the tank in Parnasa had different rayvus for the use of different castes. The upper-castes would not drink from a lower-caste rayvu and the lower-castes were not allowed to touch water from an upper-caste rayvu.
Of the four communities in Parnasa, only two had their own rayvus. The brahmins did not need a rayvu because they had their own separate source of water far away from the contamination of other castes. The kammas had a rayvu and the gollas had a rayvu but the untouchables were not given one. The only way they could get water was to beg a golla to give it to them. If the golla was in a charitable mood, the malas would get water. If not they had to go without.
In the 1920s and 30s untouchables all over India struggled for the right to have their own rayvus--not even to be allowed to use any rayvu they wanted but simply to have segregated rayvus of their own. They were fighting to take a step up to Jim Crow. Even this pathetically limited demand provoked bloody opposition from the caste Hindus. in Andhra Pradesh, the leaders of the water struggle were missionary-educated mala schoolteachers. In the 1970s when my uncle SM visited a village in Prakasham district, he met an old man known affectionately as Premaya Master who had no hands. When SM asked what had happened to him, he was told that the kammas chopped off Premaya Master's hands for leading the water struggle in that village.
Today in Parnasa the malas have their own rayvu--separate but equal.