PERMFILE57171 - Laserfiche WebLink

Home Browse Search

• PERMANENT DIVERSION NO.1 AND REFUSE COLLECTION DITCHES This section contains the calculations utilized to design the diversion and collection ditches associated with the refuse disposal area. Specifically, those structures which handle surface drainage from an area above the refuse disposal area and from the crest and face of the disposal area include: o Permanent Diversion No. 1 o Refuse Collection Ditches Permanent Diversion No. 1 routes clean surface water from an area south and west of the refuse pile to natural drainages. The refuse collection ditches collect surface drainage from the refuse pile and route it to Sedimentation Pond No. 4. The structure locations are shown on Figure 3, Refuse Disposal Area Drainage Plan. • The methodology utilized to complete the refuse area channel designs is explained in detail in the Methodology Section of this exhibit. The structure locations are shown on the Drainage and Sediment Control Map, (Map 20), and design details are contained in figures within this exhibit. Hydrology calculations and hydraulic design calculations are included for Permanent Diversion No. 1 and each refuse collection ditch. Permanent Diversion No. 1 Permanent Diversion No. 1 is located along the west boundary of the refuse disposal area as shown on Figure 3, Refuse Disposal Area Drainage Plan. This diversion routes surface runoff from an undisturbed area south and west of the refuse pile to the north where it joins with natural drainage beyond the disturbed area. The diversion is divided into three (3) sections (Sections A, B and C) • each having a different flow slope. All three (3) sections divert undisturbed runoff from an area above the refuse storage area and are therefore designed to safely pass the 100-year, 24-hour storm event providing 0.3 feet of freeboard. The peak flow calculated by SEDCAD+ is 105