Question: where does the vaal dam get its water from
[{'answer': 'Vaal River', 'provenance': [{'wikipedia_id': '842210', 'title': 'Vaal Dam', 'start_paragraph_id': 1, 'start_character': 214, 'end_paragraph_id': 1, 'end_character': 224, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '842210', 'title': 'Vaal Dam', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 483, 'bleu_score': 0.8516271886704581, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3220079763423758246}, 'section': 'Section::::Abstract.'}]}]