Agenda - 01-10-1994 - Laserfiche WebLink

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VB-Volume of Berms; Like landscaping,berms can be effective screens.They are also effective in collecting or diverting storm water runoff. Because they are a land form -CaW ' and have volume, they are included in the calculation of Beim VOA#W landscape intensity. There are no berms provided on The simplest method for calculating the volume of a berm is to the case study site. start with its cross-section. For stability,berms must have side slopes which rise one foot for each three feet of distance.The ridge or crown of the berm must contain a level surface at least five feet in width, and the base must have a minimum width of 25 feet. Based on these cross-section dimensions, the area can be calculated as a series of geometric shapes,e.g.,two triangles and a rectangle. As an example, the cross-section area of the berm shown in the accompanying sketch would be calculated as �., follows: 1 A= 112(3.33'X 10') + 1/2(3.33-X 10') + (3'X 5') 3 5' 10' Height=3.33' =48.3 sq.ft. 25' minimum Provided that the cross-section of the berm were uniform, the volume could be calculated by multiplying the cross-section When catL*ffi p the vO&M of a berm, area times the berms length. however, start w0th the cross-sectional tea• LVR-Landscape Volume Ratio:As was the case with the building volume ratio,calculation of the LVR is simply a matter of applying the formula.The constant, 10 feet,is again included in the formula as a basis for comparison; e.g., a LVR Of 1.0 is equivalent to vegetation with a height of 10 feet covering the entire site. The Cane S*AI Y-Cadaca�r bg V0*,E1971!°Mt& An important point to note is the effect that retention of existing wooded areas has on the calculation of the LVR.As ! r*kc VVA#WS shown in the case study example,the site's LVR is 2.399. If EXIsr ft forest AV d 1,334,025 cu.ft. the site had been devoid of any vegetation,the new plant Alew piW?tmater;W 547,11 t cu.ft. materials installed would be equivalent to an LVR of 0.698.As Berms Alone will be seen in the following section,the new plant materials installed would be insufficient to comply with the site volume Total VoOne 1,881,136 CU.ft. ratio. Site Area 1.80 acres or 78,408 sq.ft. Site Volume Ratio(SVR) lotV Landsca-loe Vo�Rxrae/10 ft. Site Volume Ratio s e volume oun LVR = (SVR)i th l f building, parkin g, Site Area exterior storage,and loading areas compared to the volume 1,881,136 cu.ft:/10 ft. of landscape features such as trees and shrubs on a site. 78,408 sq.ft. Specifically,the Site Volume Ratio is equal to the difference 2.399 between Landscape Volume Ratio and Building Volume Ratio (SVR= LVR- BVR). Ecorwrrdc DeveAWwntDbtrkts Desi�n MarxW Paige .2.3.10