AG 1992 12 21 - Laserfiche WebLink

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'iL APPENDIX I. Estimates of Water and Sewer Demand The demand for water and sewer services in the plan area was estimated based upon projected future land use. This analysis was done for each of four basins in the study area so that it could be better understood what the infrastructure demands will be on the area as projected development occurs. The following is a brief description of the methodology employed and the rescflts of the estimation. A similar estimation was made of the average daily traffic produced by the projected land uses, and a description of that methodology and results follows in Appendix II. Water and sewer estimations were based upon the general "Future Land Use Map" that is included in this plan. The general land uses were further defined so that estimates of housing units, and employees could be made. For example, areas designated as industrial were divided into industrial park, light industrial and heavy industrial. These refinements were not intended to replace the general projection, but instead were made for estimating purposes only. Projections of employees and units were made from the designated future land use and were adjusted to recognize real world development limitations. Comparisons were made between the density of developed areas and the permitted density. Findings showed that for residential uses that approximately .35 units can be. expected for each unit permitted. No direct method such as this was employed for non*residential use, but instead it was assumed in the final calculations that the ratio would be similar since the physical factors that affect usability are similar. The County's Geographic Information System, ARC/INFO, was employed to make the land use based calculations for water and sewer. The number of expected units was calculated for each residential polygon and the number of employees for each non-residential polygon. These numbers were then converted to expected water and sewer needs based upon actual County water, and sewer records and estimated water and sewer needs per employee taken from a data service. The e~act numbers used for each land use polygon are included in Appendix III. The total results in gallons per day, were as follows: Wa ter Sewer Rocky River Basin Coddle Creek Basin Irish Buffalo Basin 1 .Irish Buffalo Basin 2 !,947,221 1,469,365 3,148,122 2,369,498 864,026 648,683 471,845 354,521 TOTAL 6,431,214 4,842,067 These estimations have some lirrfited qualifications particularly for the residential land uses. The first qualification is that the low and medium-low density residential areas may not require community water and sewer service but instead may rely on individual septic tanks and wells. The second, and more important qua/ification, is that these calculations assume that the plan area is currently vacant. Therefore, the estimates are not adjusted for existing uses and their resultant needs, some of which have already been addressed. If this adjustment could have been made, the projected water and sewer needs would certainly be much lower if only for the number of residential units already constructed that rely on individual systems. The implications of this estimation exercise are twofold. First, these findings reinforce two recorrtmendafions of the plan. These are that land use conversion in this area will rely on infrastructure improvement, and that methods of funding these improvements, both public and private, must be explored. The second implication is that the water and sewer treatment capacities must be increased. The City of Concord is currently planning a new water treatment plant at the Coddle Creek reservoir that will meet the increased needs. The Rocky River Regional Waste Treatment Plant will also need to be enlarged to increase capacity, although the needs indicated by this estimation should not exceed capacity as it now exists. WESTERN AREA PLAN DRAFT 4 PAGE 25