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, U BU RBA N 6875 Highway No. 655N. E. 6 • E. [� N G I N E E RING P.O. Box 32308 ,, Minneapolis, Minnesota 55432 INC Civil, Municipal & Environmental En ineerin 890-6510 g g 12350 River Ridge Blvd. Land Surveying • Land Planning • Soil Testing Burnsville, Minnesota 55337 ❑ DRAINAG E PLAN .. ETTINGER DISTRIBUTION CENTER ROSEVILLE, MINNESOTA DESCRIPTION OF DRAINAGE AREA The property is located adjacent to West County Road C approximately 1/2 mile west of Interstate 35W in Roseville, Minnesota. The drainage area is within the Rice Creek Watershed District and the total property area is 12.8 acres. EXISTING SITE CONDITIONS At present the site has three, one-story buildings with the majority of the remaining property covered by bituminous parking lot. The existing parking area on the east of the property is a gravel and oil surface. The property has previously been used as a truck terminal. The site is divided into four drainage areas. The southern area flows south off of the site and is directed by a swail to a culvert under the Burlington Northern Railroad tracks which enters a 48" storm sewer. This storm sewer flows easterly until it reaches an open ditch adjacent to the Minnesota Transfer Railroad tracks where it flows northerly approximately 2 miles to Lake Jones and eventually to Rice Creek. There is an existing catch basin. in this drainage area which drains sou;.;1- erly off the property. Due to the nature of the flow patterns in its vicinity it gto a small ditch east is essentially non -effective and will therefore be neglected in the analr si follow. The eastern area flows east off the property sofo he property line. From here the water flows north to the railroad tracks. The , northwestern area drains north directly to a catch basin and an 18" storm sewer under County Road C. This storm sewer flows east and is released into the ditch adjacent to the Minnesota Transfer Railroad tracks. The northeastern area drai::s north to County Road C and is intercepted by catch basins on this roadway. This flows east to the of oremen tioned.ditch. The undeveloped runoff rate for the four drainage areas for the 1-year and 100-rear event using the rational method is: SOUTHERN AREA Tc = 9.0 minutes Q1=C1A=0.90x Q100 = 0.90 x 8.6 EASTERN AREA Tc = 14.0 minutes Ql = C1A = 0.80 x Q100 = 0.80 x 7.2 NORTHWESTERN AREA Tc = 11.0 minutes Q1 = C1A = 0.87 x Q100 = 0.87 x 8.0 3.6 in/hr x 4.6 acres = 14.9 cfs x 4.6 = 35.6 cfs 3.0 in/hr x 3.1 acres = 7.4 cfs x 3.1 = 17.9 cfs 3.3 in/hr x 2.8 acres = 8.0 cfs x 2.8=19.5cfs Wm. E. Jensen, Reg. Eng. Wm. E. Price, Reg. Eng. H. William Rogers, Reg. Surv. Gary R. Harris, Reg. Suru. Eugene A. Lindhom, Reg. Eng, William J. Brezinsky, Reg. Eng. Robert Sikich, Reg. Suru. Bruce A. Paterson, Reg. Eng. Daniel P. Johnson, Reg. Eng.