241220_42 ERW_Stormwater Report FULL

Project Name Description Analysis Date BMP or LID Type Recharge BMP Input Parameters Root Zone Water capacity Calculated Parameters Recharge Design Parameters Parameter Symbol Value Unit Parameter Symbol Value Unit Parameter Symbol Value Unit BMP Area ABMP 5404.7 sq.ft Empty Portion of RWC under Post-D Natural Recharge ERWC 0.61 in Inches of Runoff to capture Qdesign 1.84 in BMP Effective Depth, this is the design variable dBMP 3.6 in ERWC Modified to consider dEXC EDRWC 0.00 in Inches of Rainfall to capture Pdesign 2.07 in Upper level of the BMP surface (negative if above ground) dBMPu 108.0 in Empty Portion of RWC under Infilt. BMP RERWC 0.00 in Recharge Provided Avg. over Imp. Area 36.5 in Depth of lower surface of BMP, must be>=dBMPu dEXC 117.0 in Runoff Captured Avg. over imp. Area 36.5 in Post-development Land Segment Location of BMP , Input Zero if Location is distributed or undetermined SegBMP 2 unitless BMP Calculated Size Parameters CALCULATION CHECK MESSAGES ABMP/Aimp Aratio 0.48 unitless Volume Balance-> Solve Problem to satisfy Annual Recharge BMP Volume VBMP 1,621 cu.ft dBMP Check---> OK Parameters from Annual Recharge Worksheet System Performance Calculated Parameters dEXC Check---> OK Post-D Deficit Recharge (or desired recharge volume) Vdef 28,650 cu.ft Annual BMP Recharge Volume 34,489 cu.ft BMP Location---> OK Post-D Impervious Area (or target Impervious Area) Aimp 11,326 sq.ft Avg BMP Recharge Efficiency 100.0% Represents % Infiltration Recharged OTHER NOTES Root Zone Water Capacity RWC 3.69 in %Rainfall became Runoff 78.5% % Pdesign is accurate only after BMP dimensions are updated to make rech volume= deficit volume. The portion RWC Modified to consider dEXC DRWC 0.00 in %Runoff Infiltrated 95.0% % of BMP infiltration prior to filling and the area occupied by BMP are ignored in these calculations. Results are Climatic Factor C-factor 1.67 no units %Runoff Recharged 29.2% % sensetive to dBMP, make sure dBMP selected is small enough for BMP to empty in less than 3 days. For land Average Annual P Pavg 49.0 in %Rainfall Recharged 22.9% % Segment Location of BMP if you select "impervious areas" RWC will be minimal but not zero as determined by Recharge Requirement over Imp. Area dr 9.3 in the soil type and a shallow root zone for this Land Cover allowing consideration of lateral flow and other losses. How to solve for different recharge

by Recharge Requirement over Imp. Area dr 9.3 in the soil type and a shallow root zone for this Land Cover allowing consideration of lateral flow and other losses. How to solve for different recharge volumes: By default the spreadsheet assigns the values of total deficit recharge volume "Vdef" and total proposed impervious area "Aimp" from the "Annual Recharge" sheet to "Vdef" and "Aimp" on this page. This allows solution for a single BMP to handle the entire recharge requirement assuming the runoff from entire impervious area is available to the BMP. To solve for a smaller BMP or a LID-IMP to recharge only part of the recharge requirement, set Vdef to your target value and Aimp to impervious area directly connected to your infiltration facility and then solve for ABMP or dBMP. To go back to the default configuration clik the "Default Vdef & Aimp" button. 11/18/24Waymaker Proposed Site Improvements Subsurface Infiltration Basin This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.