{
  "title": "Gold Park water-accounting closure ledger",
  "calculation_version": "goldpark-closure-v1.0-2026-09-24",
  "basin": {
    "name": "USGS 09064000 Gold Park StreamStats basin",
    "area_sq_mi": 35.9029,
    "area_ac": 22977.851
  },
  "sign_convention": "P = export + Gold Park Q + losses + delta storage + net boundary terms; negative delta storage supplies water.",
  "matched_period": "WY2007-2020",
  "averages_af_per_year": {
    "precip_total_af": 61496.193663857666,
    "precip_oct_may_af": 47698.8076724689,
    "tunnel_export_af": 23344.850442857143,
    "gold_park_flow_af": 23341.304840613935,
    "gross_remainder_af": 14810.03838038659,
    "sublimation_low_af": 7068.133226555641,
    "sublimation_high_af": 9401.509241405694,
    "dwr_evaporation_account_af": 237.58012142857143,
    "reservoir_delta_s_af": -45.87866428571423,
    "storage_adjusted_remainder_af": 14855.917044672304,
    "gross_lake_evap_low_af": 812.0,
    "gross_lake_evap_high_af": 971.25,
    "fen_wetland_et_low_af": 134.0,
    "fen_wetland_et_high_af": 191.5,
    "remaining_closure_low_af": 4291.6578,
    "remaining_closure_high_af": 6841.7838
  },
  "annual_ledger": [
    {
      "water_year": 2007,
      "precip_total_af": 66447.67305005375,
      "precip_oct_may_af": 45569.626400402725,
      "tunnel_export_af": 20792.5902,
      "gold_park_flow_af": 18304.383471074383,
      "gross_remainder_af": 27350.69937897937,
      "homestake_reservoir_delta_s_af": 1159.6875,
      "storage_basis": "2006-09-30 to 2007-09-30",
      "storage_adjusted_remainder_af": 26191.01187897937,
      "sublimation_low_af": 6752.625614755583,
      "sublimation_high_af": 8981.844298344404,
      "gross_lake_evap_low_af": 812.0,
      "gross_lake_evap_high_af": 971.25,
      "dwr_evaporation_account_af": 289.75960000000003,
      "fen_wetland_et_low_af": 134.0,
      "fen_wetland_et_high_af": 191.5,
      "remaining_closure_low_af": 16046.417580634967,
      "remaining_closure_high_af": 18492.386264223787,
      "annual_closure_basis": "storage-adjusted"
    },
    {
      "water_year": 2008,
      "precip_total_af": 70570.2860344907,
      "precip_oct_may_af": 58948.69168565633,
      "tunnel_export_af": 26533.071099999997,
      "gold_park_flow_af": 34210.333884297506,
      "gross_remainder_af": 9826.881050193188,
      "homestake_reservoir_delta_s_af": -399.3594000000012,
      "storage_basis": "2007-09-30 to 2008-09-30",
      "storage_adjusted_remainder_af": 10226.240450193189,
      "sublimation_low_af": 8735.17026308942,
      "sublimation_high_af": 11618.878892256953,
      "gross_lake_evap_low_af": 812.0,
      "gross_lake_evap_high_af": 971.25,
      "dwr_evaporation_account_af": 283.6741,
      "fen_wetland_et_low_af": 134.0,
      "fen_wetland_et_high_af": 191.5,
      "remaining_closure_low_af": -2555.388442063764,
      "remaining_closure_high_af": 545.0701871037691,
      "annual_closure_basis": "storage-adjusted"
    },
    {
      "water_year": 2009,
      "precip_total_af": 66406.54761123112,
      "precip_oct_may_af": 51722.24478133664,
      "tunnel_export_af": 51353.3506,
      "gold_park_flow_af": 20225.15702479339,
      "gross_remainder_af": -5171.960013562271,
      "homestake_reservoir_delta_s_af": -20630.1387,
      "storage_basis": "2008-09-30 to 2009-09-30",
      "storage_adjusted_remainder_af": 15458.178686437728,
      "sublimation_low_af": 7664.336588900045,
      "sublimation_high_af": 10194.534958546783,
      "gross_lake_evap_low_af": 812.0,
      "gross_lake_evap_high_af": 971.25,
      "dwr_evaporation_account_af": 213.03390000000002,
      "fen_wetland_et_low_af": 134.0,
      "fen_wetland_et_high_af": 191.5,
      "remaining_closure_low_af": 4100.893727890945,
      "remaining_closure_high_af": 6847.842097537683,
      "annual_closure_basis": "storage-adjusted"
    },
    {
      "water_year": 2010,
      "precip_total_af": 57860.01172732893,
      "precip_oct_may_af": 44464.566243144065,
      "tunnel_export_af": 9023.5961,
      "gold_park_flow_af": 16328.370247933888,
      "gross_remainder_af": 32508.045379395036,
      "homestake_reservoir_delta_s_af": 15909.3887,
      "storage_basis": "2009-09-30 to 2010-09-30",
      "storage_adjusted_remainder_af": 16598.656679395037,
      "sublimation_low_af": 6588.874930073984,
      "sublimation_high_af": 8764.035221184324,
      "gross_lake_evap_low_af": 812.0,
      "gross_lake_evap_high_af": 971.25,
      "dwr_evaporation_account_af": 271.7396,
      "fen_wetland_et_low_af": 134.0,
      "fen_wetland_et_high_af": 191.5,
      "remaining_closure_low_af": 6671.871458210713,
      "remaining_closure_high_af": 9063.781749321053,
      "annual_closure_basis": "storage-adjusted"
    },
    {
      "water_year": 2011,
      "precip_total_af": 75777.82964264593,
      "precip_oct_may_af": 62169.1154297692,
      "tunnel_export_af": 32240.0471,
      "gold_park_flow_af": 34149.56033057851,
      "gross_remainder_af": 9388.22221206742,
      "homestake_reservoir_delta_s_af": 2403.080600000001,
      "storage_basis": "2010-09-30 to 2011-09-30",
      "storage_adjusted_remainder_af": 6985.1416120674185,
      "sublimation_low_af": 9212.381019082613,
      "sublimation_high_af": 12253.629425214085,
      "gross_lake_evap_low_af": 812.0,
      "gross_lake_evap_high_af": 971.25,
      "dwr_evaporation_account_af": 257.5179,
      "fen_wetland_et_low_af": 134.0,
      "fen_wetland_et_high_af": 191.5,
      "remaining_closure_low_af": -6431.237813146667,
      "remaining_closure_high_af": -3173.239407015195,
      "annual_closure_basis": "storage-adjusted"
    },
    {
      "water_year": 2012,
      "precip_total_af": 43862.42160372912,
      "precip_oct_may_af": 29460.923737791534,
      "tunnel_export_af": 42101.7114,
      "gold_park_flow_af": 20098.690909090925,
      "gross_remainder_af": -18337.980705361806,
      "homestake_reservoir_delta_s_af": -39421.170000000006,
      "storage_basis": "2011-09-30 to 2012-09-30",
      "storage_adjusted_remainder_af": 21083.1892946382,
      "sublimation_low_af": 4365.596209154214,
      "sublimation_high_af": 5806.79392833257,
      "gross_lake_evap_low_af": 812.0,
      "gross_lake_evap_high_af": 971.25,
      "dwr_evaporation_account_af": 67.0226,
      "fen_wetland_et_low_af": 134.0,
      "fen_wetland_et_high_af": 191.5,
      "remaining_closure_low_af": 14113.645366305629,
      "remaining_closure_high_af": 15771.593085483986,
      "annual_closure_basis": "storage-adjusted"
    },
    {
      "water_year": 2013,
      "precip_total_af": 62406.680742615354,
      "precip_oct_may_af": 42108.93358209826,
      "tunnel_export_af": 19125.025999999998,
      "gold_park_flow_af": 17134.115702479343,
      "gross_remainder_af": 26147.539040136013,
      "homestake_reservoir_delta_s_af": 645.29,
      "storage_basis": "2012-09-30 to 2013-09-30",
      "storage_adjusted_remainder_af": 25502.249040136012,
      "sublimation_low_af": 6239.811163209479,
      "sublimation_high_af": 8299.736356855228,
      "gross_lake_evap_low_af": 812.0,
      "gross_lake_evap_high_af": 971.25,
      "dwr_evaporation_account_af": 92.213,
      "fen_wetland_et_low_af": 134.0,
      "fen_wetland_et_high_af": 191.5,
      "remaining_closure_low_af": 16039.762683280784,
      "remaining_closure_high_af": 18316.43787692653,
      "annual_closure_basis": "storage-adjusted"
    },
    {
      "water_year": 2014,
      "precip_total_af": 65617.26165814434,
      "precip_oct_may_af": 49447.774010376226,
      "tunnel_export_af": 16545.5636,
      "gold_park_flow_af": 23303.76198347107,
      "gross_remainder_af": 25767.93607467327,
      "homestake_reservoir_delta_s_af": null,
      "storage_basis": "NA",
      "storage_adjusted_remainder_af": null,
      "sublimation_low_af": 7327.299601740009,
      "sublimation_high_af": 9746.233229092157,
      "gross_lake_evap_low_af": 812.0,
      "gross_lake_evap_high_af": 971.25,
      "dwr_evaporation_account_af": 143.3872,
      "fen_wetland_et_low_af": 134.0,
      "fen_wetland_et_high_af": 191.5,
      "remaining_closure_low_af": 14858.952845581114,
      "remaining_closure_high_af": 17494.636472933264,
      "annual_closure_basis": "gross; annual reservoir delta unavailable"
    },
    {
      "water_year": 2015,
      "precip_total_af": 61732.76598978231,
      "precip_oct_may_af": 47511.1533137941,
      "tunnel_export_af": 4184.5106,
      "gold_park_flow_af": 25338.74380165291,
      "gross_remainder_af": 32209.5115881294,
      "homestake_reservoir_delta_s_af": null,
      "storage_basis": "NA",
      "storage_adjusted_remainder_af": null,
      "sublimation_low_af": 7040.326116223554,
      "sublimation_high_af": 9364.5222752034,
      "gross_lake_evap_low_af": 812.0,
      "gross_lake_evap_high_af": 971.25,
      "dwr_evaporation_account_af": 274.9925,
      "fen_wetland_et_low_af": 134.0,
      "fen_wetland_et_high_af": 191.5,
      "remaining_closure_low_af": 21682.239312926,
      "remaining_closure_high_af": 24223.185471905846,
      "annual_closure_basis": "gross; annual reservoir delta unavailable"
    },
    {
      "water_year": 2016,
      "precip_total_af": 62496.686310694764,
      "precip_oct_may_af": 47458.364657139005,
      "tunnel_export_af": 4617.9848,
      "gold_park_flow_af": 35220.25785123968,
      "gross_remainder_af": 22658.443659455086,
      "homestake_reservoir_delta_s_af": null,
      "storage_basis": "NA",
      "storage_adjusted_remainder_af": null,
      "sublimation_low_af": 7032.503755953017,
      "sublimation_high_af": 9354.117548804534,
      "gross_lake_evap_low_af": 812.0,
      "gross_lake_evap_high_af": 971.25,
      "dwr_evaporation_account_af": 302.5036,
      "fen_wetland_et_low_af": 134.0,
      "fen_wetland_et_high_af": 191.5,
      "remaining_closure_low_af": 12141.576110650552,
      "remaining_closure_high_af": 14679.939903502069,
      "annual_closure_basis": "gross; annual reservoir delta unavailable"
    },
    {
      "water_year": 2017,
      "precip_total_af": 61062.174985182326,
      "precip_oct_may_af": 49498.013778579036,
      "tunnel_export_af": 23018.5373,
      "gold_park_flow_af": 26950.869421487598,
      "gross_remainder_af": 11092.768263694732,
      "homestake_reservoir_delta_s_af": -16.7300000000032,
      "storage_basis": "2016-09-29 to 2017-09-30",
      "storage_adjusted_remainder_af": 11109.498263694735,
      "sublimation_low_af": 7334.744261098522,
      "sublimation_high_af": 9756.135565609417,
      "gross_lake_evap_low_af": 812.0,
      "gross_lake_evap_high_af": 971.25,
      "dwr_evaporation_account_af": 288.5795,
      "fen_wetland_et_low_af": 134.0,
      "fen_wetland_et_high_af": 191.5,
      "remaining_closure_low_af": 190.6126980853187,
      "remaining_closure_high_af": 2828.7540025962135,
      "annual_closure_basis": "storage-adjusted"
    },
    {
      "water_year": 2018,
      "precip_total_af": 46945.207821711585,
      "precip_oct_may_af": 39080.76675696055,
      "tunnel_export_af": 20346.4257,
      "gold_park_flow_af": 9909.024793388437,
      "gross_remainder_af": 16689.757328323147,
      "homestake_reservoir_delta_s_af": -1024.6100000000006,
      "storage_basis": "2017-09-30 to 2018-09-30",
      "storage_adjusted_remainder_af": 17714.367328323147,
      "sublimation_low_af": 5791.0895368896,
      "sublimation_high_af": 7702.879961900047,
      "gross_lake_evap_low_af": 812.0,
      "gross_lake_evap_high_af": 971.25,
      "dwr_evaporation_account_af": 298.854,
      "fen_wetland_et_low_af": 134.0,
      "fen_wetland_et_high_af": 191.5,
      "remaining_closure_low_af": 8848.7373664231,
      "remaining_closure_high_af": 10977.277791433547,
      "annual_closure_basis": "storage-adjusted"
    },
    {
      "water_year": 2019,
      "precip_total_af": 68062.84611285194,
      "precip_oct_may_af": 58599.613356958,
      "tunnel_export_af": 34060.2058,
      "gold_park_flow_af": 30673.685950413215,
      "gross_remainder_af": 3328.9543624387225,
      "homestake_reservoir_delta_s_af": 111.17000000000553,
      "storage_basis": "2018-09-30 to 2019-09-30",
      "storage_adjusted_remainder_af": 3217.784362438717,
      "sublimation_low_af": 8683.442929553423,
      "sublimation_high_af": 11550.075010286417,
      "gross_lake_evap_low_af": 812.0,
      "gross_lake_evap_high_af": 971.25,
      "dwr_evaporation_account_af": 254.8003,
      "fen_wetland_et_low_af": 134.0,
      "fen_wetland_et_high_af": 191.5,
      "remaining_closure_low_af": -9495.0406478477,
      "remaining_closure_high_af": -6411.658567114706,
      "annual_closure_basis": "storage-adjusted"
    },
    {
      "water_year": 2020,
      "precip_total_af": 51698.31800354516,
      "precip_oct_may_af": 41743.51968055898,
      "tunnel_export_af": 22885.285900000003,
      "gold_park_flow_af": 14931.312396694208,
      "gross_remainder_af": 13881.719706850949,
      "homestake_reservoir_delta_s_af": -763.7799999999988,
      "storage_basis": "2019-09-30 to 2020-09-30",
      "storage_adjusted_remainder_af": 14645.499706850947,
      "sublimation_low_af": 6185.66318205552,
      "sublimation_high_af": 8227.712708049381,
      "gross_lake_evap_low_af": 812.0,
      "gross_lake_evap_high_af": 971.25,
      "dwr_evaporation_account_af": 288.04389999999995,
      "fen_wetland_et_low_af": 134.0,
      "fen_wetland_et_high_af": 191.5,
      "remaining_closure_low_af": 5255.036998801566,
      "remaining_closure_high_af": 7513.836524795428,
      "annual_closure_basis": "storage-adjusted"
    }
  ],
  "storage_ledger": [
    {
      "water_year": 2007,
      "start_af": 41254.0313,
      "end_af": 42413.7188,
      "delta_s_af": 1159.6875,
      "basis": "2006-09-30 to 2007-09-30",
      "status": "Approved exact Sep 30"
    },
    {
      "water_year": 2008,
      "start_af": 42413.7188,
      "end_af": 42014.3594,
      "delta_s_af": -399.3594000000012,
      "basis": "2007-09-30 to 2008-09-30",
      "status": "Approved exact Sep 30"
    },
    {
      "water_year": 2009,
      "start_af": 42014.3594,
      "end_af": 21384.2207,
      "delta_s_af": -20630.1387,
      "basis": "2008-09-30 to 2009-09-30",
      "status": "Approved exact Sep 30"
    },
    {
      "water_year": 2010,
      "start_af": 21384.2207,
      "end_af": 37293.6094,
      "delta_s_af": 15909.3887,
      "basis": "2009-09-30 to 2010-09-30",
      "status": "Approved exact Sep 30"
    },
    {
      "water_year": 2011,
      "start_af": 37293.6094,
      "end_af": 39696.69,
      "delta_s_af": 2403.080600000001,
      "basis": "2010-09-30 to 2011-09-30",
      "status": "Approved exact Sep 30"
    },
    {
      "water_year": 2012,
      "start_af": 39696.69,
      "end_af": 275.52,
      "delta_s_af": -39421.170000000006,
      "basis": "2011-09-30 to 2012-09-30",
      "status": "Approved exact Sep 30"
    },
    {
      "water_year": 2013,
      "start_af": 275.52,
      "end_af": 920.81,
      "delta_s_af": 645.29,
      "basis": "2012-09-30 to 2013-09-30",
      "status": "Approved exact Sep 30"
    },
    {
      "water_year": 2014,
      "start_af": 920.81,
      "end_af": null,
      "delta_s_af": null,
      "basis": "NA",
      "status": "No public DWR Sep endpoint during dam repair"
    },
    {
      "water_year": 2015,
      "start_af": null,
      "end_af": null,
      "delta_s_af": null,
      "basis": "NA",
      "status": "No public DWR Sep endpoint during dam repair"
    },
    {
      "water_year": 2016,
      "start_af": null,
      "end_af": 42305.68,
      "delta_s_af": null,
      "basis": "NA",
      "status": "Approved Sep 29 proxy"
    },
    {
      "water_year": 2017,
      "start_af": 42305.68,
      "end_af": 42288.95,
      "delta_s_af": -16.7300000000032,
      "basis": "2016-09-29 to 2017-09-30",
      "status": "Approved exact Sep 30"
    },
    {
      "water_year": 2018,
      "start_af": 42288.95,
      "end_af": 41264.34,
      "delta_s_af": -1024.6100000000006,
      "basis": "2017-09-30 to 2018-09-30",
      "status": "Approved exact Sep 30"
    },
    {
      "water_year": 2019,
      "start_af": 41264.34,
      "end_af": 41375.51,
      "delta_s_af": 111.17000000000553,
      "basis": "2018-09-30 to 2019-09-30",
      "status": "Approved exact Sep 30"
    },
    {
      "water_year": 2020,
      "start_af": 41375.51,
      "end_af": 40611.73,
      "delta_s_af": -763.7799999999988,
      "basis": "2019-09-30 to 2020-09-30",
      "status": "Approved exact Sep 30"
    },
    {
      "water_year": 2021,
      "start_af": 40611.73,
      "end_af": 29244.17,
      "delta_s_af": -11367.560000000005,
      "basis": "2020-09-30 to 2021-10-01",
      "status": "Approved Oct 1 proxy"
    },
    {
      "water_year": 2022,
      "start_af": 29244.17,
      "end_af": 29532.24,
      "delta_s_af": 288.07000000000335,
      "basis": "2021-10-01 to 2022-09-30",
      "status": "Approved exact Sep 30"
    },
    {
      "water_year": 2023,
      "start_af": 29532.24,
      "end_af": 34715.375,
      "delta_s_af": 5183.134999999998,
      "basis": "2022-09-30 to 2023-09-30",
      "status": "Approved exact Sep 30"
    },
    {
      "water_year": 2024,
      "start_af": 34715.375,
      "end_af": 42265.53,
      "delta_s_af": 7550.154999999999,
      "basis": "2023-09-30 to 2024-09-30",
      "status": "Approved exact Sep 30"
    }
  ],
  "storage_block": {
    "period": "2013-09-30 to 2016-09-29",
    "delta_s_af": 41384.87,
    "status": "combined block only; no annual allocation"
  },
  "component_screens": [
    {
      "component": "Total precipitation (rain + snow water equivalent)",
      "low": 61496.1937,
      "central": 61496.1937,
      "high": 61496.1937,
      "units": "AF/yr",
      "evidence_class": "modeled basin input",
      "period": "WY2007-2020",
      "include": 1,
      "overlap_group": "input",
      "source_ids": "gp-prism-800m-modern-20260924",
      "interpretation": "PRISM 800-m total precipitation; not a rain/snow phase split or SWE inventory."
    },
    {
      "component": "Oct-May precipitation (mixed phase denominator)",
      "low": 47698.8077,
      "central": 47698.8077,
      "high": 47698.8077,
      "units": "AF/yr",
      "evidence_class": "modeled seasonal input",
      "period": "WY2007-2020",
      "include": 0,
      "overlap_group": "input-subset",
      "source_ids": "gp-prism-800m-modern-20260924",
      "interpretation": "Subset of total precipitation used only as the snow-process denominator; includes rain."
    },
    {
      "component": "Interbasin export through Homestake Tunnel",
      "low": 23344.8504,
      "central": 23344.8504,
      "high": 23344.8504,
      "units": "AF/yr",
      "evidence_class": "approved administrative record",
      "period": "WY2007-2020",
      "include": 1,
      "overlap_group": "recorded-output",
      "source_ids": "tunnel-divrec-month-20260924",
      "interpretation": "DWR total-diversion class 13704614 counted once; feeder classes overlap."
    },
    {
      "component": "Gold Park discharge",
      "low": 23341.305,
      "central": 23341.305,
      "high": 23341.305,
      "units": "AF/yr",
      "evidence_class": "observed + approved estimated daily flow",
      "period": "WY2007-2020",
      "include": 1,
      "overlap_group": "recorded-output",
      "source_ids": "gp-usgs-daily-20260924",
      "interpretation": "Integrated USGS daily means at the checkpoint below all five intakes and reservoir."
    },
    {
      "component": "Snow sublimation planning screen",
      "low": 7068.1332,
      "central": 8234.8212,
      "high": 9401.5092,
      "units": "AF/yr",
      "evidence_class": "literature transfer scenario",
      "period": "average WY2007-2020 denominator",
      "include": 1,
      "overlap_group": "snow-atmosphere",
      "source_ids": "sexstone-2016;sexstone-2018;schwat-2025",
      "interpretation": "15-20% of terrestrial Oct-May precipitation after excluding alternative lake-area footprints. It is a planning band, not a calibrated basin estimate."
    },
    {
      "component": "Gross Homestake Reservoir evaporation",
      "low": 812.0,
      "central": 891.625,
      "high": 971.25,
      "units": "AF/yr",
      "evidence_class": "fixed-area physical scenario",
      "period": "climatological annual proxy",
      "include": 1,
      "overlap_group": "open-water-atmosphere",
      "source_ids": "usbr-cul-methods-2025;nid-co00673",
      "interpretation": "Alternative 278.4- and 333-acre scenarios. They are not annual observations and do not track drawdown area."
    },
    {
      "component": "DWR reservoir evaporation account",
      "low": 237.5801,
      "central": 237.5801,
      "high": 237.5801,
      "units": "AF/yr",
      "evidence_class": "administrative comparison",
      "period": "WY2007-2020",
      "include": 0,
      "overlap_group": "open-water-comparator",
      "source_ids": "reservoir-divrec-month-20260924",
      "interpretation": "Administrative account derived by water year. Never add to gross lake evaporation."
    },
    {
      "component": "Mapped-fen partial-season ecosystem ET",
      "low": 134.0,
      "central": 162.75,
      "high": 191.5,
      "units": "AF/yr",
      "evidence_class": "High Creek analogue screen",
      "period": "15 Jul–1 Nov normal-year analogue",
      "include": 1,
      "overlap_group": "fen-ecosystem-et",
      "source_ids": "blanken-2014;cnhp-fens-2025",
      "interpretation": "September 24, 2026 normal-year scenario. 247–353 mm applied to 165.324 mapped confirmed + potential fen acres. Includes vegetation, soil and wet-surface vapor flux."
    },
    {
      "component": "Plant transpiration",
      "low": null,
      "central": null,
      "high": null,
      "units": "AF/yr",
      "evidence_class": "unresolved within closure",
      "period": "WY2007-2020",
      "include": 0,
      "overlap_group": "land-et-partition",
      "source_ids": "berkelhammer-2016;knowles-2015",
      "interpretation": "No defensible basin AF/yr. If the full post-fen remainder were land ET, a 60% closure-allocation sensitivity would be about 2,575-4,105 AF/yr, but that is a ceiling scenario, not an estimate."
    },
    {
      "component": "Soil + wet-canopy evaporation",
      "low": null,
      "central": null,
      "high": null,
      "units": "AF/yr",
      "evidence_class": "unresolved within closure",
      "period": "WY2007-2020",
      "include": 0,
      "overlap_group": "land-et-partition",
      "source_ids": "berkelhammer-2016;knowles-2015",
      "interpretation": "Cannot isolate soil-only flux. A complementary 40% closure-allocation sensitivity would be about 1,717-2,737 AF/yr if all remainder were land ET."
    },
    {
      "component": "Fen/wetland annual storage change",
      "low": null,
      "central": null,
      "high": null,
      "units": "AF/yr",
      "evidence_class": "unmeasured signed storage",
      "period": "annual endpoint",
      "include": 0,
      "overlap_group": "storage",
      "source_ids": "cnhp-fens-2025;cnhp-wetlands-2025",
      "interpretation": "Unknown. Sensitivity: 16.53 AF per 0.1 ft mean water-equivalent endpoint change over all mapped fens; 33.21 AF over vegetated wetlands."
    },
    {
      "component": "Diversion-pond annual storage change",
      "low": null,
      "central": null,
      "high": null,
      "units": "AF/yr",
      "evidence_class": "no public storage series",
      "period": "annual endpoint",
      "include": 0,
      "overlap_group": "storage",
      "source_ids": "dwr-stagevolume-3704516",
      "interpretation": "No feeder-intake stage-volume records or separately inventoried pond were found. NULL means unmeasured, not zero."
    },
    {
      "component": "Groundwater/aquifer storage change",
      "low": null,
      "central": null,
      "high": null,
      "units": "AF/yr",
      "evidence_class": "unmeasured signed storage",
      "period": "annual endpoint",
      "include": 0,
      "overlap_group": "storage",
      "source_ids": "carroll-2020;thiros-2023",
      "interpretation": "Recharge is an internal pathway; later baseflow is already in Gold Park Q. No basin monitoring network supports an AF/yr storage estimate."
    },
    {
      "component": "Net cross-boundary groundwater flow",
      "low": null,
      "central": null,
      "high": null,
      "units": "AF/yr",
      "evidence_class": "unknown signed boundary flux",
      "period": "WY2007-2020",
      "include": 0,
      "overlap_group": "boundary-flow",
      "source_ids": "carroll-2020;thiros-2023",
      "interpretation": "Direction and magnitude are unmeasured. The remaining closure is only an algebraic ceiling if all other omitted terms and error were zero."
    },
    {
      "component": "Remaining unassigned closure after screened terms",
      "low": 4291.6578,
      "central": 5566.7208,
      "high": 6841.7838,
      "units": "AF/yr",
      "evidence_class": "residual, not a process estimate",
      "period": "WY2007-2020 mean",
      "include": 1,
      "overlap_group": "closure",
      "source_ids": "calculated",
      "interpretation": "September 24, 2026 normal-year fen scenario. Contains upland and wet-meadow ET, early-season wetland ET, snow/soil/GW storage, possible net groundwater flow, ponds, and input/measurement error."
    }
  ],
  "mapped_areas_ac": {
    "confirmed_fens": 11.593,
    "potential_fens": 153.731,
    "all_mapped_fens": 165.324,
    "nwi_vegetated_other": 332.104,
    "nwi_all_including_water": 1064.701
  },
  "nulls": [
    "diversion pond storage",
    "fen/wetland annual storage",
    "groundwater storage",
    "net cross-boundary groundwater flow",
    "plant transpiration",
    "soil-only evaporation"
  ],
  "edition_scope": {
    "status": "Historical September 24, 2026 normal-year fen scenario",
    "fen_depth_mm_partial_season": [
      247,
      353
    ],
    "current_full_range_calculation_url": "https://savehomestake.com/evidence/record/#WATER:GP-BUDGET",
    "current_full_range_depth_mm": [
      101,
      353
    ],
    "current_full_range_fen_af_per_year": [
      54.782559055118114,
      191.4677559055118
    ],
    "current_full_range_remainder_af_per_year": [
      4291.690047361098,
      6921.001259061546
    ]
  }
}