http://vocab.lternet.edu/vocab/vocab/http://vocab.lternet.edu/vocab/vocab/skos/275irrigation http://vocab.lternet.edu/vocab/vocab/skos/275 humans RT http://vocab.lternet.edu/vocab/vocab/skos/275 droughts RT http://vocab.lternet.edu/vocab/vocab/skos/275 water balance RT http://vocab.lternet.edu/vocab/vocab/skos/275 hydrologic processes BT