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<br />Average Flow <br /> <br />The existing capacity is stated in the current NPDES permit as 49 mgd that represents the <br />dry season design rating for the WPCF. The current loading or current required capacity is <br />43.8 mgd (presented in DSMM terms). The DSMM value is used to compare to the dry <br />season design rating of the WPCF because the NPDES discharge permit stipulates that the <br />WPCF meet monthly average permit requirements. Therefore, discharge permit <br />requirements must be met on a dry season, maximum-month influent condition. This <br />43.8-mgd value is determined as follows: <br /> <br />Current average flow (presented as DSMM) = ((129 x 217,737 x 1.5)/1,000,000) + 1. 7i = 43.8 <br />Where: <br /> <br />129 is the average gallons per capita per day (gpcd) of the dry season values from <br />1990 to 2002 <br /> <br />217,737 is the population served in 2002 <br /> <br />1.5 is the selected peaking factor to convert average dry season flow to maximum <br />month dry season flow (based on 1990 to 2002 data) <br /> <br />1.7i is the current industrial flow in mgd <br /> <br />The available capacity in terms of average flow is 5.2 mgd (49 - 43.8). <br />The projected 2025 average flow is determined as follows: <br />Projected 2025 average flow (presented DSMM) = ((129 x 297,585 x 1.5)/1,000,000) + 1. 7 = <br />59.3 mgd <br />Where: <br /> <br />129 is the average gpcd of the dry season values from 1990 to 2002 <br /> <br />297,585 is the projected population to be served in 2025 <br /> <br />1.5 is the selected peaking factor to convert average dry season flow to maximum <br />month dry season flow (based on 1990 to 2002 data) <br /> <br />1.7 is the projected industrial flow in mgd (it has been assumed that the <br />industrial flow will remain constant over the study period) <br /> <br />The total required capacity to meet the needs of growth in terms of average flow is 15.5 mgd <br />(59.3 - 43.8). <br /> <br />Peak Flow <br /> <br />A summary of the peak flow breakdown is presented in Table C-2. The existing capacity in <br />terms of peak flow is not defined in the NPDES permit, but the plant was originally <br />designed for a peak flow of 175 mgd, and therefore that is defined as the existing capacity. <br />MWMC does not currently have the collection and treatment capabilities to accommodate <br />the existing peak flow (which is greater than 175 mgd), and therefore the current peak flow <br />loading (required capacity) cannot be explicitly measured at the WPCF. Using a computer <br /> <br />A.28 <br />