COM 1470.000 2006-2008 - Laserfiche WebLink

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estimates for water use in the district is somewhere between the high number that includes agricultural use and the low number that does not include agricultural use. Neither of the estimates that include or do not include agriculture use, when taken by themselves, paints a complete picture of projected future water demand in the district, hence, both numbers are given. A more complete and detailed explanation of future water use projections can be found in the 2006 Hawaii County Water Use and Development Plan Update. , Future projected water demand based upon current County zoning designations exceeds ASYA. Sustainable yields in the Mahukona ASYA and Waimea ASYA if agricultural demand is taken into account. If future agricultural water demand is not taken into account, future projections for water demand do not exceed the sustainable yields of any of the four ASYA. Future projected water demand based upon population projections for the year 2025 does not exceed the sustainable yields of the ASYA's. The Waimanu ASYA can safely accommodate water demand in all of the future water demand projection scenarios. However, the Waimanu ASYA is not being currently used. Furthermore, considering the Waimanu ASYA as a viable and economically feasible source to meet future demand may not be practical. Waimanu ASYA incorporates lands that are not readily accessible by vehicles and thus it would be a difficult area to develop groundwater sources. Also, there is the environmental and cultural concern of diverting water from this conservation watershed area to another watershed area. Lastly, consideration must also be given to the current and future water demands of North Kohala as much of the Waimanu ASYA encompasses lands in the district of North Kohala. Also in 2001, the County DWS conducted hydrogeological studies ofhigh-level ground water in Waimea. The purpose of the studies was to evaluate the potential of the high-level aquifer system to supply Waimea Town and South Kohala's coastal communities. The study involved an area of 122,023 acres from the summit of the Kohala Mountain to the 5,000 foot elevation of the northern slope of Mauna Kea. The study concluded that there are ample ground water resources of good quality within the study area that could be used to supply water to Waimea and the other coastal communities in the district. However, utilizing these high-level ground water resources will require the DWS to construct more water delivery infrastructure such as new wells, storage facilities, and transmission lines. (Hydrogeologic Study of the Waimea High-Level Ground Water, 2001) Water Delivery Systems The Waimea Water System primarily services the Waimea and Puukapu area. From Waimea Town, the system extends along Mamalahoa Highway westward and runs down Kawaihae Road for about eight miles. From Waimea Town, the system extends eastward to the two connections at the Haina Water System at the South Kohala district boundary near Mud Lane. The water system spans three aquifer sector areas; but the majority of the service area is within the Kohala ASEA, including the majority of Waimea Town, and the areas north'of Mamalahoa Highway from Kawaihae to the Kamuela Highlands subdivision. Improvements to the system have increased reservoir capacity and enlarged the distribution pipelines. The primary water sources for the Waimea Water System are 17