Laserfiche WebLink
SCOTTLAND GREEN POND DESIGN CALCULATIONS <br />A. FINAL LAND USE IN DRAINAGE AREA <br />From drainage area boundaries shown in the report entitled "Report <br />on Storm Water Drainage Facilities for City of Moundsview" by Short, <br />Elliott, Hendrickson, and Associates, Inc., the tributary drainage area <br />to the proposed Scottland Green Pond was determined to be 266 acres. <br />The final land use breakdown is based on present land use for all <br />areas except the -proposed Kraus Anderson development. In that area, <br />the land use is as shown on the attached generalized development plan. <br />Any idle land not in the development area was assumed to be developed <br />to 50 percent impervious. The following table shows a breakdown of <br />land uses. <br />Percent Total <br />Land Use Impervious Area Impervious Pervious__ <br />Open Space <br />10 <br />34.0 <br />3.4 <br />30.6 <br />Residential <br />35 <br />94.0 <br />32.9 <br />61.1 <br />Mult. Res. <br />55 <br />25.5 <br />14.0 <br />11.5 <br />Commercial <br />75 <br />25.6 <br />19.2 <br />6.4 <br />TH--10 ROW <br />40 <br />26.0 <br />10.4 <br />15.6 <br />City Hall <br />40 <br />18.2 <br />7.3 <br />10.9 <br />Subtotal <br />87.2 <br />136.1' <br />Undeveloped <br />Land <br />not on KA <br />proj. 50 <br />25.7 <br />12.8 <br />12.9 <br />Pond Area <br />17.0 <br />Totals <br />266.0 <br />100.0 <br />149.0 <br />SUMMARY <br />FOR VOLUME <br />COMPS: <br />LAKE <br />17.0 <br />Acres <br />IMPERVIOUS 100.0 <br />" <br />PERVIOUS 149.0 <br />" <br />B. INFILTRATION IN TURFED AREAS (PERVIOUS AREAS) <br />Soil types in the area are sands having high infiltration rates. <br />These are common all over the City of Moundsview. In the Kraus Anderson <br />project, water table is normally more than six feet in depth. Use the <br />SCS classification of soils as Zimmerman Soils <br />From the SCS curves for CN a 50, the runoff for a 24 hour rainfall <br />event of 5.9 inches will be 1.1 inches. For this calculation, we used <br />1.3 inches per hour for the turfed areas. <br />