{
  "fields": [{"id":"_id","type":"int"},{"id":"時間軸コード","type":"numeric"},{"id":"時間軸（西暦）","type":"text"},{"id":"時間軸（和暦）","type":"text"},{"id":"区分","type":"text"},{"id":"水系数（単位なし）","type":"numeric"},{"id":"水系数_うち実数（単位なし）","type":"numeric"},{"id":"支流川数（単位なし）","type":"text"},{"id":"延長（m）","type":"numeric"}],
  "records": [
    [1,2023000000,"2023年","令和5年","一級河川",8,7,"253",1734535],
    [2,2023000000,"2023年","令和5年","二級河川（支流を有するもの）",32,32,"67",439471],
    [3,2023000000,"2023年","令和5年","二級河川（単独河川）",49,49,"-",187544]
]}