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TABLE 13-4A-5 <br />As-Built Storage Capacity Summary <br />Pond 011 <br /> Capacity <br />Elevation Stage (Ac.-Ft.) Descri ption <br />5990. 00 0 0 Bcitcm of Pond Excavation <br />7ooa. ao 14.40 3.17 Elevat ion of Principal Spillway <br /> b 1009 Sediment Storage <br />7006. 67 16.67 4.33 10-Yr, 24-Hr. Feak Stage <br />1007. 00 17,OD 4.53 Crest of Emerq=_o-_y spillway <br />7008. t14 1E.04 5.12 25-'i r. , _°4-Hr. Feak Stage <br />700E . 18 1E.1B .,. [0 100-'i t ., ?4-Hr. Feak Sage <br />7009. SG 1P.50 5.G3 Tap ct Embankment <br />Seneca does not anticipate any ether inflow to the pond at this time. The pn ncipal <br />spillway will be nonclogging and will automatically dewatet the ponding area to maintain <br />the design capacity foc the runoff volume for a 10-year, 24-hour storm event. <br />Spillways <br />This sediment pond has two separate spillways; a principal and an emergency. PLease see <br />Exhibit 13-SA for. location of spillways. The principal aptllway consists of a 12-inch <br />diameter Corr ugaCed metal pipe ~CP1P~. This Fipe will keep the pond level at the 7004.40 <br />el =_vation. Maaimum es[rmated elevation (peak stage) above the principal spillway with <br />the passage at the 10-year, 'c4-hour event will be 7006.67, this leaves 0.33 feet to the <br />emergency spillway (elevation 7007,00. <br />The emba n4:ment portion of the emergency spillway consists of a n prap crapezcid al channel <br />as shown on Exhibit 13-SA. Assuming the principal spillway was pluggetl, the trapezoidal <br />channel could safely pass the runoff volume from [he f5-year and 100-year., 24-hour storm. <br />The emergency spillway outflow channel consists a riprapped trapezoidal channel which was <br />underlayed with Miraii 600:1 geo[er.i ile see Addendum 13-4A-D Eor specificaiionsl. <br />13-4A-E Revised 12;12797 <br />