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C. STAGE VOLUME CALCULATIONS <br />Following are area and volume computations for the proposed pond <br />based on the contours shown on the attached plan sheet <br />Contour Area -Acres A, + A, L/2 Volume-AF <br />892 14.99 <br />894 18.78 <br />896 21.30 <br />33.77 1.0 33.77 <br />40.08 1.0 40.08 <br />The cumulative volume between elevation 892.0 (the control elevation) <br />and 895.7 (the 100 year flood level) will be 67.84 Acre Feet. <br />D. ELEVATION CONTROLS <br />Following are elevation controls used in selecting the control and <br />100 year pond elevations for Scottland Green Pond. <br />a. Invert of driveway culvert near the east side of the Scottland <br />Green Apartments = 891.5. <br />b. Ice elevation (water level) in ditch downstream from Scottland <br />Green Apartment east driveway = 892.4. <br />c., Low basement elevation in Scottland Green Apartments - 897.72. <br />d. Overflow elevation of Long Lake Road about k mile south of <br />the Scottland Green Apartments. = 893.2. <br />The normal pond level selected of 892.0 was somewhat higher than <br />the present culvert invert to the east of the apartments. It should <br />be noted that some ditch cleanou t must be done south of County Road H-2 <br />in order for this elevation to function as the control level (see the <br />above ice elevation). <br />The 100 year maximum pond level of 895.7 will provide 2 feet of free- <br />board above the pond to the low basement of the Apartment complex. <br />E. DISCHARGE -VOLUME CALCULATIONS <br />Duration <br />1 hr <br />2 hr <br />3 hr <br />6 hr <br />12 hr <br />24 hr <br />2 day <br />4 day 10 day 30 day <br />TP-40 <br />2.90 <br />3.40 <br />3.80 <br />4.30 <br />5.10 <br />5.90 <br />7.00 <br />8.20 <br />Lake (17 A) <br />4.1 <br />4.8 <br />5.4 <br />6.1 <br />7.2 <br />8.4 <br />9.9 <br />11.6 <br />Impervious (100 A) <br />21.8 <br />25.5 <br />28.5 <br />32.3 <br />38.3 <br />44.3 <br />52.5 <br />61.5 (7") (10") <br />Pervious (149 A) <br />16.1 <br />16.1 <br />16.1 <br />16.1 <br />16.1 <br />16.1 <br />16.1 <br />16.1 <br />Runoff Volume AF 42.0 46.4 50.0 54.5 61.6 68.8 78.5 89.2 155.1 221.7 <br />Store <br />67.8 AF <br />67.8 67.8 67.8 67.8 67.8 67.8 <br />67.8 <br />67.8 <br />67.8 <br />67.8 <br />AF req'd <br />AF/day <br />out <br />out <br />- -- - - - 1.0 <br />- - -- - - 1.0 <br />10:.7 <br />5.3 <br />21.4 <br />5.3 <br />87.3 <br />8.7 <br />153.9 <br />5.1 <br />