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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Figure 4 shows the conceptual pressurized transmission system described in this report. <br /> <br />Water Stora~ <br /> <br />Temporary storage of the irrigation water is required for this system. As described <br />previously, three storage reservoirs will be utilized for the pressurized irrigation systems. <br />The recommended size for each storage facility is approximately three times the peak <br />season daily irrigation water requirement being pumped from that reservoir. This size will <br />allow for flexibility in the delivery schedule to each reservoir and "insurance" that the <br />irrigation system can continue to operate normally in an event where water cannot be <br />delivered for a day or two. The new North reservoir will be sized for approximately 50 <br />acre feet of storage. <br /> <br />The preferred storage facilities for this project are excavated ponds with a PVC liner, <br />geotextile fabric, and 12-inches of soil backfill above the lining system. Each pond <br />should be excavated to contain a water depth of 15-feet and lined with a 30 mil PVC <br />liner and 8-ounce geotextile fabric. A 12-inch depth of soil over the geotextile is required <br />to protect the liner system and create a natural appearance. The side slopes of the pond <br />should not be steeper than 4H:1V for safety issues and liability concerns. <br /> <br />The surface area of the proposed pond near Prospect Street will be approximately 2 <br />acres to store about 50 acre feet of usable irrigation water based on the above design <br />criteria. <br /> <br />Concerns about the water quality in the existing Timnath Reservoir suggest that a new <br />water storage reservoir should be created to assist with water quality improvements. A <br />common issue when using raw water for irrigation is the potential for poor water quality, <br />specifically algae blooms and odors. In order to minimize the risk of this occurring, lake <br />bed aeration systems are recommended. This new reservoir will be adjacent to the <br />Timnath Reservoir on the south and sized for approximately 60 acre feet of water <br />storage. The surface area of this pong will be about 5 acres. <br /> <br />Lake bed aeration systems do not mechanically move the water or aerate it by spraying <br />it into the air. Rather, lake bed systems aerate ponds by bubbling air or a combination of <br />air and ozone through the water. This method is significantly more efficient, is not <br />noticeable unless the water surface is totally calm, and is less expensive to operate. The <br />air bubbles out of 3-inch long laser cut slits in polyethylene pipe that is weighted in order <br />to sink to the bottom of the pond. Typically the tubing sections are 250-feet in length with <br />several sections being used in large ponds. Exact length and compressor requirements <br />are based on pond volume and water depth in the pond, Alternatively, localized aeration <br />modules can also be used in lake bed aeration systems where several modules take the <br />place of the weighted tubing. <br /> <br />As water is pumped out of the pond and replaced on a consistent basis, the turnover of <br />water is relatively high and the opportunity for water stagnation or algae blooms is <br />reduced. <br /> <br />5 The Kern Reservoir (Lake Windsor) is also a potential fourth reservoir and pump station site but <br />the site is not part of the current hydraulic model and cost analysis. <br /> <br />Aqua Engineering, Inc. <br />June 7,2004 <br /> <br />Canal Modernization Feasibility Study <br />- 13- <br />