смотреть фильм предчувствие 2013 в хорошем качестве
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смотреть фильм предчувствие 2013 в хорошем качестве, Bioretention: Sizing - LID SWM Planning and Design Guide, Bioretention Treatment Best Management Practice Design Guide - Caltrans, Bioretention Cell - NC.gov, The following guidance has been incorporated into Rainwater and , Bioretention Design Handbook: Designing Holistic Bioretention for , Stormwater Best Management Practice, Home - City of Columbia Water.
For practices with an underdrain where the perforated pipe is installed on the bottom and connected to a riser (e.g., standpipe and two 45 degree couplings), infiltration water storage is provided by the storage reservoir depth between the inverts of the riser outlet (i.e invert elevation of the top 90 degree coupling) and reservoir bottom, and is calculated the same way as above. See page for further design guidance and information on water quality treatment benefits of internal water storage reservoirs or zones in partial infiltration bioretention designs., This spreadsheet tool has been set up to perform all of the bioretention sizing calculations shown below and allows side-by-side comparison of equation outputs for each potential design approach or constraint scenario., The following calculation method is used to size the TBMP footprint area necessary to treat the required WQV (Claytor and Schueler 1996): Af = WQV (df / [k (hf + df) tf]) Where: Af = Minimum surface area of the bioretention ponding area (ft2) WQV = Water Quality Volume (ft3) df = Media layer depth (ft) k = Coefficient of permeability for .
DESIGN VOLUME. The maximum ponding depth for the design volume shall be 12 inches above the. planting surface. This MDC is used to calculate the required surface area of the bioretention cell, which is equal to the required treatment volume divided by ., For all bioretention practices, the minimum size of the filter bed shall be at least equal to the Water Quality Volume (WQv) divided by the ponding depth to a maximum depth of 18 inches., This document serves as a guide to designing, implementing, and maintaining bioretention facilities; selection of and specifications for individual facility designs should be based on a thorough analysis of site conditions and awareness of local regulations., Bioretention practices are well suited to small sites in urbanized settings and can filter stormwater from small to medium storms. Designers generally bypass stormwater discharges from larger storms past a bioretention practice to a larger stormwater control or the storm drain system., Af = (WQv * df)/[k*(hf + df)*tf] where: surface area of ponding area . feet. coefficient of permeability of filter media . ft/day. average height of water above filter bed., To effectively design a bioretention pond in Hydrology Studio, it is recommended to construct a single pond featuring two outlet devices: an exfiltration system and an overflow weir..