CCP 09-11-1995 - Laserfiche WebLink

Home Browse Search

I I. .Specific soil type location is relevant to whether the soil can support the development or if water- related problems will occur such as wet basements, flooding, etc. Water levels are more I pertinent to the avoidance of these problems. Stormwater management design will ensure that flooding of the site or of neighboring properties does not occur due to the project. The 100-year I flood elevation for Valentine Lake is 880.3. The lowest floor elevation is at 883.5 feet. It is expected that the project will encounter no water-related problems, based on the I GO-year flood elevation. I 7. Water Oualitv. Surface Water Runoff, Erosion I Several comments were received stating that more information should be provided about the sediment basin design, amounts of runoff and stormwater management. and that several homes I in the area have drainage problems~ Several commenters ask that more information be supplied aboUlthe requirements of Rice Creek Watershed District regarding slOrmwater management, erosion control. and the like~ I The following storm water calculations were submitted to the DNR and the Rice Creek I Watershed District for permit review~ Storage for 5~year and lOO-year storms. I- Area 5.34 acres Runoff for 5-year storm ? ..,..,,, _.JJ Runofffor 100-year storm 3.29" Normal Water Level I dead storage required far 5-year storm: J ......." x 5.34 acres x 43.560 sf ~ 45,165 cu~ ft --=-:U..- 12"/ft 1 acre I additional storage required for [OO.year stann (no outtJow): 3.29" x 5.34 x 43,560 = 63,775 cu. ft. I 12 High Water Level I additional storage required for tOO-year storm with outflow := 2.3 cfs := 0.7 acre ft, 12" RCP@ 0.40% 30,492 cu~ ft. 45,165 cu. ft. = 75,657 cu~ ft. I I I I . Responses to Comments Ogren Townhome PUD page 8 I