PROJ00483 - Laserfiche WebLink

Home Browse Search

I I I I II I I I I I I I I II I I I I I I provided for at this time because it is probably more than 20 years in the future. The estimated water usage at buildout for 395 units is 192 acre-feet (62 MG) based upon 430 GUD. The average GUD at buildout is expected to increase by about 25% over the present usage to allow for more common areas and commercial development. I~ L TOTAL USAGE Tables 111-8 and III-C summarize the water usage in 1990 and at buildout, respectively by month for each District. Columns 2 and 3 show the estimated monthly GUD and acre-foot usage for District No. 1 in 1990 and at buildout. Columns 4 and 5 show the GUD and acre-foot usage for District No. 2 in 1990 and at buildout. Column 6 shows the combined water usage in acre-feet for both districts. Column 7 shows the average monthly flow in CFS for each month. Column 8 shows the estimated peak week flow for each month based upon a 15% increase above the average monthly flow. The values shown in Table III-C, the estimated water usage at buildout are the critical amounts for the study. The water supply that is obtained and the facilities to deliver the water are based upon the values in Table III-C. The records indicate that the peak month can occur in June, July, or August, and in most years the three months are about the same. This study assumes that the water demand is the same for the three summer months; the actual average flows could be plus or minus 10% in any particular year. The seven-day peak flow for the water demand at buildout, Column 7 of Table III-C, is used to size the delivery facilities. The estimated seven-day peak flow of 0.74 CFS (330 gpm) is 190% of the average yearly flow of 0.39 CFS (175 gpm), which is higher than the normal 170% to 180% range. The 190% was used to assure that there is adequate water and capacity available to provide the necessary water. Since the seven-day peak is high, it approximates the one- day peak flow. The peak hourly flow during the peak day is about double the average flow, so the peak hour would be about 1.5 CFS (660 gpm). The facilities will be sized to deliver 0.75 CFS (330 gpm) during the peak, therefore, requiring that the peak hourly flow be met from storage. About 20,000 gallons of water would be required during the peak hour from storage; the districts presently have about 1,160,000 gallons of storage. There is adequate storage in conjunction with the delivery of 0.75 CFS (330 gpm) to meet the peak day and peak hour demands. ") In summary, the Districts would require water rights an delivery facilities to provide about 280 acre-feet (92 MG) per year; 90 acre-feet from November to April and 190 acre-feet from May to October. The facilities should be able to provide a peak of 0.75 CFS (330 gpm) for a short term peak and an average flow fo, 'h. p..k monfh of 0.64 CF:~(~mJ.