README.md

In dCraigJones/rSSOAP: rSSOAP

rSSOAP

Overview

Analysis using the EPA SSOAP toolbox typically relies on weeks or months of flow meter and rain gauge data at timesteps ranging from 5-min to 15-min. At this resolution, data collection can be costly, time-consuming, and contain noisy measurement errors. Instead, rSSOAP relies on long-term (1 or 2 years) of hourly (or daily) flow and rain gauge data. While less accurate, this approach is useful for developing planning-level wet-weather hydraulic models or identifying liftstation basins for further investigation.

Installation

library(devtools)
devtools::install_github("dCraigJones/rSSOAP")

Background

Wastewater flow patterns are a complex phenomenon that are often sub-divided into Dry-Weather Flow and Wet-Weather Flow. Dry-Weather Flow (DWF) is the combination of Base Sewer Flow (BSF) and Ground Water Intrustion (GWI). BSF is the collected wastewater from customers that follows a predictable daily pattern in aggregate, called a diurnal. GWI is the relatively constant flow from leaky infrasturcture during periods of high groundwater table. Wet-Weather Flow (WWF) is the addition of Rainfall Derived Inflow (RDI) to DWF. RDI is increased flow following rain events, usually defined by an unit hydrograph. The final component is an error term ($\epsilon$), which includes iid noise and allows for uncertainty during special events such as holidays, abnormal weather, and mechanical issues.

In general, BSF should correspond to a percentage of water consumption. GWI is often measured in terms of upstream gravity pipelines, in terms of GPD/IDM (or Gallons/Day per Inch-Diameter Miles). RDI is usually measured as a percentage of total runoff.

##  --- Base Sewer Flow (kGPD) ----------------- 
##  Weekday:  101.8 
##  Weekend:  99.1 
##  
##  --- Peaking Factor ------------------------- 
##               min     95%     99% 
##  Weekday:    0.12    2.41    4.67 
##  Weekend:    0.12    2.44    4.66 
##  
##  --- Ground Water Infiltration (kGPD) ------- 
##  50%:  62.1 ( 29.2 gpm ) 
##  95%:  105.5 ( 73.2 gpm ) 
##  99%:  193.2 ( 134.1 gpm ) 
##  
##  --- Rainfall Derived Inflow (GPM) ---------- 
##        6-hour SCS Type-II Storm 
##      MA:  323.7 
##    5-YR:  397.5 
##   25-YR:  613.2 
##  
##  Total Volume: 59.32 kGal/inch ( 122.23 acre ) 
##  
##  --- Peak Hourly Flow (GPM) ----------------- 
##  min  (5%):  37.2 
##  DWF (95%):  243.5 
##  WWF (99%):  1,077.5 (25-YR 6-HR)

Liftstation Runtime Flow

Work in Progress

Rainfall

Public Rain Gauge Data

Work in Progress

Double-Mass Curve

Work in Progress

I&I Model - Diagnostic Graphs

Q-i Chart

Event Timeseries

Curve-Fitting RTK Parameters

| # | R | T | K | |:-:|:-:|:-:|:-:| | 1 | 0.001942409 | 1.6918 | 2.9759 | | 2 | 0.002132323 | 2.8004 | 3.9940 | | 3 | 0.003341376 | 3.7522 | 5.6965 |

References

1 Mikalson, Daley & Guo, Yiping & J. Adams, Barry. (2012). Rainfall Derived Inflow and Infiltration Modeling Approaches. Journal of Water Management Modeling. 10.14796/JWMM.R245-08.

2 US EPA. (2007). Computer Tools for Sanitary Sewer System Capacity Analysis and Planning. Publication No. EPA/600/R-07/111.

3 US EPA. (2014). Guide for Estimating Infiltration and Inflow.

Other Packages

This package is part of a water/wastewater planning toolset. Other packages include:

• n185, for visual fire flow analysis.
• pumpR, for pumpstation hydraulic analysis.
• rSSOAP, for Inflow & Infiltration Analysis.

dCraigJones/rSSOAP documentation built on Aug. 12, 2022, 10:11 p.m.