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Home My WebLink AboutP_ Filterra Detail Dwg_200207_v1.pdf© 2016 Contech Engineered Solutions LLCInstalled without Bypass Curb InletStandard 4’ Throat on all sizesUtilizes Terraflume to divert bypass flows away from media.6”, 8”, or 10” Overflow PipesRecommended Outlet Chamber allows for design flexibilityPedestrian live load, 4000 lb wheel load mounting the curb, and HS-20 Live Load Surcharge on the walls.Standard Rim-Outlet Depth = 48” +/-oMinimum Rim – Outlet Depth = 42” (15” Media Depth)oMaximum Rim-Outlet Depth = 62” (3’ Max depth from Rim to Media Surface) –Not RecommendedFilterra Internal Bypass – Curb (FTIBC)1Size Throat LengthMax Bypass Size (in)Max Bypass Flow (cfs)*4x4 4’-0” 6” 1.44x6/6x4 4’-0” 8” 1.94x8/8x4 4’-0” 8” 1.96x6 4’-0” 8” 1.96x8/8x6 4’-0” 8” 1.96x10/10x6 4’-0” 8” 1.96x12/12x6 4’-0” 10” 2.47x13/13x7 4’-0” 10” 2.4 © 2016 Contech Engineered Solutions LLCFilterra Internal Bypass – Curb Dimensions16” Underdrain Stone(Mounded over Bypass Pipe)21” Filterra Media3” Mulch9” +/- Ponding Area48” +/- Rim to Outlet5” +/- Overflow Area1” Typical Above Vault Floor © 2016 Contech Engineered Solutions LLCFTIBC Single Unit Layout Considerations1 © 2016 Contech Engineered Solutions LLCFTIBC Double Unit Layout Considerations1Problem:Upstream unit will get overloaded, and downstream unit will get skipped.Caution:Flow from either direction must be able to be accommodated by each individual unit.Caution:Flow from either direction must be able to be accommodated by each individual unit. © 2016 Contech Engineered Solutions LLC Filterra –Internal Bypass Curb Inlet © 2016 Contech Engineered Solutions LLC Filterra –Internal Bypass Piped Inlet Toll Free: 1-800-338-1122 www.ContechES.comENGINEERED SOLUTIONS ® Bioretention Systems© 2017 Contech Engineered Solutions LLC Filterra® Bioretention Attractive, Functional, and Flexible Filterra is similar to bioretention in its function and application, but has been optimized for high volume/flow treatment and high pollutant removal. Filterra is available in a number of arrangements, providing engineers a solution that minimizes footprint and maintenance cost with the flexibility to meet functional and aesthetic goals. Standard Tree Grate • Standard Filterra offering on all vault products • 12” tree opening provides space for plant growth with minimal sidewalk interruption Recessed Top Slab • Allows sod or other landscaping on top of the Filterra vault • Available when using standard and custom 3’x3’ or 4’x4’ tree grates Filterra Bioscape • Filterra option without a concrete container • All components provided by Contech and assembled by certified providers for maximum quality control Filterra Bioscape Vault • Fully open top vault option • Available in precast (<150 sf) and cast-in-place (>150 sf) Custom/Decorative Tree Grate • Custom patterned grates available upon request • Custom grates must meet size requirements (contact your Contech Representative for more information) Full Grate with Grasses • Allows pedestrian traffic in tight walkways • Improves line-of-sight at intersections Sizing Based on the Western Washington Hydrology Model (WWHM) TSS/Phosphorous Oil/Grease Metals Hydraulic Conductivity: 70.92 in/hr 35.46 in/hr 24.82 in/hr VANCOUVER Size Acres Treated Acres Treated Acres Treated 4x4 0.349 0.187 0.136 4x6 & 6x4 0.528 0.279 0.202 Vancouver NNE rain gauge 4x8 & 8x4 0.705 0.372 0.269 precip factor = 1.110 6x6 0.794 0.419 0.303 6x8 & 8x6 1.063 0.561 0.404 6x10 & 10x6 1.332 0.702 0.507 6x12 & 12x6 1.615 0.844 0.609 TACOMA Size Acres Treated Acres Treated Acres Treated 4x4 0.421 0.219 0.159 4x6 & 6x4 0.633 0.325 0.234 38 in CENTRAL rain gauge 4x8 & 8x4 0.845 0.433 0.31 precip factor = 1 6x6 0.952 0.487 0.349 6x8 & 8x6 1.272 0.651 0.465 6x10 & 10x6 1.594 0.814 0.582 note:1901‐2059 (yr) 6x12 & 12x6 1.925 0.981 0.701 EVERETT Size Acres Treated Acres Treated Acres Treated 4x4 0.391 0.206 0.151 4x6 & 6x4 0.589 0.309 0.223 Everett rain gage 4x8 & 8x4 0.795 0.413 0.297 precip factor = 1 6x6 0.886 0.463 0.335 6x8 & 8x6 1.185 0.619 0.447 6x10 & 10x6 1.485 0.774 0.558 6x12 & 12x6 1.805 0.933 0.671 SEATTLE Size Acres Treated Acres Treated Acres Treated 4x4 0.384 0.203 0.148 4x6 & 6x4 0.578 0.303 0.219 Seatac rain gauge 4x8 & 8x4 0.771 0.403 0.29 precip factor = 1 6x6 0.871 0.454 0.327 6x8 & 8x6 1.165 0.607 0.437 6x10 & 10x6 1.461 0.76 0.547 6x12 & 12x6 1.787 0.914 0.657 Notes: 1. All treatment areas are based on 100% impervious contributing drainage area. 2. Filterra size assumes offline configuration and 21" of media 3. For sizing in other areas, contact your Contech Engineered Solutions Stormwater Design Engineer.