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<br /> Wastewater Treatment System .� -�- FALL CREEK
<br /> °- Engineering Report ENGINEERING,INC.
<br /> Maximum Storage (SWm,,,and SPm,,,). Both the wetland and the stormwater detention area will
<br /> have a small storage volume of 69,600 and 67,300 gallons, respectively.
<br /> %W Initial Conditions. The wetland was assumed to be half full at the beginning of each year.
<br /> %W Average and wet rainfall years were modeled to assess the capacity of the proposed wetland/land
<br /> disposal system to manage wastewater and stormwater discharged from the winery utilizing
<br /> calculated wastewater flow data.
<br /> 3.3.1. Water Balance Calculation for Average Annual Rainfall
<br /> 141
<br /> 1r The estimated flow rates for the current expansion is approximately 0.2 million gallons of
<br /> `, process water is generated per year. Table 3.3 presents the results of the water balance
<br /> calculations based on this process water estimate and the stormwater flow in an average rainfall
<br /> year (0.5 million gallons). The water balance calculations show that during average rainfall
<br /> %W years, the field performs hydraulically without any overflow.
<br /> Table 3.3. Water Balance Calculations for the System
<br /> in an Average Rainfall Year (17.9 inches/year).
<br /> Wetland Grass Stormwater Detention Area
<br /> Process water Storm-water Direct Wetland ET Wetland Wetland Direct Grass E cess Direct
<br /> Month Flow(gal) runoff(gal) Rainfall (gal) Storage Own- Rainfall Grass ET Infiltration Water Rainfall ;EPt
<br /> T F149,620
<br /> Storage Overflow
<br /> Pt(gal) St al) RWt l) EWt al SWt al) OWt(gal) RGt((gal) EGt(gal) IGt(gal) OGt(gal) RPt((gal) al SP(( I) ON
<br /> '%r Januar, 2,055 106,926 21,917 5,309 69,618 90,779 30,469 7,381 244.404 - 18,653 5,498 - -
<br /> Febmary 6.962 100,636 20.628 8.365 69,618 119,860 28,677 11,630 244,404 - 17,555 9,621March 7,707 77,254 15,835 16,257 69.618 84,539 22,014 22,601 244,404 - 13,477 19,242 - -
<br /> April 7,459 33,773 6,923 24,852 69,618 23,303 9,624 34,549 244,404 - 5,892 30,042 149,620
<br /> May 5,138 17,765 3,641 34,433 61,729 _ 5,062 47,869 244,404 _ 3,099 43,983 149,620 - -
<br /> June 4.973 2,797 573 40,737 29.335 797 56,633 244.404 488 44,375 149,620
<br /> r July 5.138 994 204 41,275 - - 283 57,381 244,404 - 173 56.549 149,620 - -
<br /> August 30,830 247 51 36,124 - 70 50.220 244,404 - 43 48,499 149.620 - -
<br /> September 49.725 7,511 1,540 27,079 31,697 - 2,140 37,646 244.404 - 1,310 36,325 149,620 -
<br /> October 43,675 32,021 6.563 17,018 69,618 27,320 9,124 23,658 244,404 - 5,586 21,991 149,620 -
<br /> i Novembe 19,890 57,465 11,779 8,694 69,618 80,440 16,375 12.087 244,404 - IU 025 9,621 149,620 - -
<br /> December 20.553 74.905 15,354 4,449 69.618 106,363 21,345 6.185 244 404 13,067 5?01 149,620
<br /> Total 204.105 512.294 105,006 264.593 532,604 145,981 367,840 2932.851 - 89,367 331.048 1,795.440 -
<br /> .. In some years the wetland may dry out during the hot summer months when there is little or no
<br /> rainfall and little process water discharges. During these times it is recommended that fresh
<br /> water be added to the wetland. Additions of water could help maintain the vegetation.
<br /> 3.3.2. Water Balance Calculations for High Annual Rainfall
<br /> Table 3.4 presents the results of the water balance calculations based on the same process flow
<br /> rates as above and projected stormwater flows in a high rainfall year. The water balance
<br /> calculations show that the system is adequate to accommodate the current summer and crush
<br /> wastewater flows as well as stormwater flows.
<br /> MW
<br /> y IESSIE'S GROVE WINERY MAY 2002
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