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Client: Jenkins Poultry Farms QC1# G-94-841 Project: Mello Road Ranch Page 2 accumulation and odors., However, if the lagoon truly operaten facultatively, odor control will be enhanced. Design capacity was the first objective prior to lagoon construction. Yearly manure production from 75, 000 layers is calculated to be 109, 500 cu ft. The south lagoon has a storage capacity of 144, 251 cu ft. From the scientific literature, calculations show the expected anaerobic lagoon life expectancy, until it is 50t full of sludge to be: 0 . 016 m3/bird/yr (sludge accumulation rate) = 0 . 016 X 75, 000 layers= 1, 200 m3/yr 4, 080 0 storage capacity + 1200 m3/yr= 3 .5 yrs . The climatic conditions present at the lagoons, especially the hot summers will increase sludge degradation. It is anticipated that the south lagoon will have to be draglined every five to seven years . Rainwater storage capacity was the second objective for design considerations . The north lagoon, which is nearly equal in capacity as the south lagoon, will be used as rainfall runoff overflow. From the published isopluvials of the 25 yr, 24 hr precipitation, the data indicates 2 . 5 inches of rain for this storm event . Using the rational method for stormwater runoff : the formula is Q=Cia, where Q= runoff volume needed in cu ft . The entire surface area for both lagoons, embankments and levee roads is 62, 500 sq ft. The runoff coefficient for a pond is 1 . 0 and the runoff in feet (incorporating a 25t safety factor on the 2 . 5 inches of rain) is 0 .26 . Therefore: Q (cu ft needed) = 62, 500 X 1.00 X 0 .26 = 16, 250 X 2 (safety factor) = 32, 500 cu ft of needed storage. The north lagoon has a capacity of 71, 928 cu ft which allows for sufficient rainfall storage . t I . ............ Err1 N � QuilityJO ntrol J.'Ped.