IFS: 6014 – Honokōhau Stream, Maui

Instream Flow Standard: Hydrologic Unit of Honokōhau (6014)


Instream Flow Standard

CFS
MGD
Location / Notes
Natural flow Natural flow Kaluanui Stream, Natural flow below abandoned Honokōhau Ditch diversion.
13.31 8.6 Phase One: The interim IFS on Honokōhau Stream at McDonald’s Dam (at the 340 foot elevation), shall be a flow of 8.6 mgd. The interim IFS represents the restoration of 64% of median base flow (BFQ50) as estimated at USGS 16620000 (7.4 mgd), plus the additional 2.3 mgd of groundwater gains between USGS 16620000 and Aotaki Weir and 1.4 mgd of groundwater gains between Aotaki Weir and McDonald’s Dam minus 2.5 mgd for the Maui DWS. The interim IFS is expected to be in excess of the water needs to support the existing needs of lo‘i as well as future acreage while protecting aquatic biota, recreation, and domestic uses at all elevations, and ensuring sufficient water to meet traditional and customary practices 100% of the time in Honokōhau Valley. MLP is required to meet the interim IFS 100% of the time. There should also be adequate ditch flow to meet Maui DWS needs of 2.5 mgd at the Māhinahina WTF 100% of the time. It is understood that during extreme drought (< Q90; < 11.0 mgd at Aotaki Weir), 100% of the off-stream needs of non-public trust uses may not be met.
Variable
(at Q50 to at Q90)
Variable
(10.4 at Q50 to 6.8 at Q90)
Phase 2 (upon initial DHHL implementation of Regional Plan): The interim IFS on Honokōhau Stream at McDonald’s Dam (at the 340 foot elevation), shall be a variable interim IFS (See Table 2 below). The interim IFS will be the restoration of 50% of total flow at USGS 16620000 plus 2.4 mgd in groundwater gained between USGS 16620000 and McDonald’s Dam. The 2.4 mgd is 50% of the estimated 4.8 mgd in total groundwater gain between USGS 16620000 and McDonald’s Dam. The interim IFS is expected to support all instream values and Honokōhau Valley domestic uses while providing for non-instream public trust uses (domestic uses provided by Maui DWS and DHHL). MLP is required to meet the interim IFS 100% of the time. There should also be adequate ditch flow to meet Maui DWS needs of 2.5 mgd at the Māhinahina WTF 100% of the time. With 2.0 mgd of non-potable agricultural water for DHHL, Maui DEM can blend 2.1 mgd of R1 water from the Lahaina Wastewater Treatment Facility at 50:50 to make available 4.2 mgd of non-potable water to meet the agricultural needs of DHHL and other agricultural uses in the Lahaina Region. It is understood that during extreme drought (< Q90; < 11.0 mgd at Aotaki Weir), 100% of the off-stream needs of non-public trust uses may not be met. However, Kapalua Water Company (KWC) has plenty of capacity in its drilled wells to utilize groundwater as a backup supply for its non-potable needs when insufficient water is available in the ditch.

Gaging


Information Updates

Date
Action
Oct. 19, 2021

Commission on Water Resource Management Meeting (View virtual Meeting on Vimeo)

  • Agenda
  • Submittal B1: Approve Amendment to Commission Order to Maui Land & Pineapple for Modification to Diversion 770 on Honokōhau Stream (Honokōhau Ditch Intake #1) Originally Approved on November 20, 2019, in Order to Meet the Instream Flow Standard for Honokōhau Stream, Surface Water Hydrologic Unit of Honokohau (6014), Honokōhau, Maui
  • Minutes
May 18, 2021

Commission on Water Resource Management Meeting (View virtual Meeting on Vimeo)

  • Agenda
  • Submittal B2: Approve Surface Water Reservation of 2.00 Million Gallons per Day for the Department of Hawaiian Home Lands and Amend Interim Instream Flow Standards for Honokōhau and Kaluanui Streams in the Surface Water Hydrologic Unit of Honokōhau (6014) and Honolua Stream in the Surface Water Hydrologic Unit of Honolua (6013), West Maui
    • Exhibit 1: Instream Flow Standard Assessment Report for Honolua Hydrologic Unit 6013, PR-2019-02
    • Exhibit 2: Instream Flow Standard Assessment Report for Honokōhau Hydrologic Unit 6014, PR-2019-03
    • Exhibit 3: Compilation of Public Review Comments, Hydrologic Units of Honolua (6013) and Honokōhau (6014), PR-2019-04
    • Exhibit 4: Staff Submittal, April 20, 2021, Item C5, Status of Request for Surface Water Reservation of 2.00 Million Gallons per Day for the Department of Hawaiian Home Lands and Draft Interim Instream Flow Standards for Honokōhau and Kaluanui Streams in the Surface Water Hydrologic Unit of Honokōhau (6014) and Honolua Stream in the Surface Water Hydrologic Unit of Honolua (6013), West Maui
    • Briefing
    • Testimony
  • Minutes
Apr. 20, 2021

Commission on Water Resource Management Meeting (View virtual Meeting on Vimeo)

  • Agenda
  • Briefing C5: Status of Request for Surface Water Reservation of 2.00 Million Gallons per Day for the Department of Hawaiian Home Lands and Draft Interim Instream Flow Standards for Honokōhau and Kaluanui streams in the Surface Water Hydrologic Unit of Honokōhau (6014) and Honolua Stream in the Surface Water Hydrologic Unit of Honolua (6013), West Maui
  • Minutes
Sep. 15, 2020

Commission on Water Resource Management Meeting (View virtual Meeting on Vimeo)

  • Agenda
  • Submittal B1: Approval of Stream Diversion Works Permit Application (SDWP.5358.6) to Abandon Diversion No.

    768 on Kaluanui Stream by Maui Land & Pineapple Co., Inc., and Find that SDWP.5358.6 is Exempt from Hawaii

    Revised Statutes, Chapter 343,Kaluanui Stream, Lahaina, Maui TMK:(2)4-1-001:009
  • Minutes
Nov. 20, 2019

Commission on Water Resource Management Meeting

  • Agenda
  • Item C2: Request to Address the Waste Complaint Filed by Ka Malu O Kahalawai and West Maui Preservation Association Against Maui Land and Pineapple Company Alleging Water Diverted from Honokōhau Stream Overflows the Honokōhau Ditch, Pursuant to Hawai‘i Revised Statutes §174C13, and to Amend the Interim Instream Flow Standards for the Surface Water Hydrologic Units of Honolua (6013) and Honokōhau (6014), West Maui
    • Exhibit 1: Instream Flow Standard Assessment Report for Honolua Hydrologic Unit 6013, PR-2019-02
    • Exhibit 2: Instream Flow Standard Assessment Report for Honokōhau Hydrologic Unit 6014, PR-2019-03
    • Exhibit 3: Compilation of Public Review Comments, PR-2019-04
  • Minutes

References

  • Cheng, C.L., 2014, Low-flow characteristics of streams in the Lahaina District, West Maui, Hawaiʻi: U.S. Geological Survey Scientific Investigations Report 2014–5087, 58 p., http://dx.doi.org/10.3133/sir20145087.
  • Engott, John A., and Vana, Thomas T. 2007, Effects of agricultural land-use changes and rainfall on ground-water recharge in central and west Maui, Hawaii, 1926-2004: U.S. Geological Survey Scientific Investigations Report 2007-5103, 56 p., http://pubs.usgs.gov/sir/2007/5103/.
  • Fontaine, R.A., 2003, Availability and Distribution of Base Flow in Lower Honokohau Stream, Island of Maui, Hawaii: U.S. Geological Survey Water-Resources Investigations Report 03-4060, 44 p., https://pubs.usgs.gov/wri/wri034060/.
  • Gingerich, S.B., and Engott, J.A., 2012, Groundwater availability in the Lahaina District, west Maui, Hawaiʻi: U.S. Geological Survey Scientific Investigations Report 2012–5010, 90 p., http://pubs.usgs.gov/sir/2012/5010/.
  • Johnson, A.G., Engott, J.A., Bassiouni, Maoya, and Rotzoll, Kolja, 2018, Spatially distributed groundwater recharge estimated using a water-budget model for the Island of Maui, Hawai`i, 1978–2007 (ver. 2.0, February 2018): U.S. Geological Survey Scientific Investigations Report 2014–5168, 53 p., https://doi.org/10.3133/sir20145168.
  • Shade, Patricia J., 1996, Water Budget for the Lahaina District, Island of Maui, Hawaii: U.S. Geological Survey Water-Resources Investigations Report 96-4238, 27 p., https://doi.org/10.3133/wri964238.