IFS: 6008 – Kahoma and Kanahā Streams, Maui

Instream Flow Standard: Hydrologic Unit of Kahoma (6008)


The Commission on Water Resource Management has amended the interim instream flow standards for Kahoma and Kanahā Streams within the surface water hydrologic unit of Kahoma, in West Maui.

Diversion on Kanahā Stream The diversion on Kahoma Stream is maintained by Kamehameha Schools for agricultural irrigation.
Diversion on Kanahā Stream The diversion on Kanahā Stream is maintained by the Maui Department of Water supply for municipal use.

Instream Flow Standard

CFS
MGD
Location / Notes
5.4 3.49 Kahoma Stream, at an elevation of 1,850 feet, below diversion 951.6.  This will guarantee at least 2.08 mgd reaches the 650 feet elevation on Kahoma Stream, above the lo‘i complex, except during low-flow periods, in which the flow in the stream will be the natural flow and no water will be diverted off stream.
1.24 0.8 Kanahā Stream, below diversion 954.6.  This represents the flow necessary for continual mauka to makai flow in addition to the projected consumptive demand of 3.34 acres of lo‘i kalo, with 0.67 mgd of flow through also contributing to downstream flow. This interim IFS is expected to continue to meet the noninstream water needs of H. Michel (0.03 mgd), Lahainaluna High School (0.10 mgd), and Maui DWS (1.65 mgd) approximately 90 percent of the time; except when streamflow drops below the estimated 90th percentile flow of 2.65 mgd.

Gaging


Information Updates

Date
Action
Nov. 2018

Commission on Water Resource Management Meeting
West Maui Veterans Hall
Lahaina, Hawai‘i 96761
10:00 am

Oct. 9, 2018

Notice of Public Fact Gathering Meeting:
Instream Flow Standard Assessment Report for the Hydrologic Unit of Kahoma (6008) – Kahoma and Kanahā Streams

The public fact gathering meeting was held on the Island of Maui:
October 9, 2018 (Tuesday), 5:30 p.m. to 8:30 p.m.
Lahainaluna Intermediate School Cafeteria
871 Lahainaluna Road, Lahaina, Maui, HI  96761

Sep. 25, 2018

Notice of Public Fact Gathering Meeting:
Instream Flow Standard Assessment Report for the Hydrologic Unit of Kahoma (6008) – Kahoma and Kanahā Streams

Sep. 2018

Draft Instream Flow Standard Assessment Reports for Kahoma.


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/.
  • 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.