Flow Monitoring of Blueprint Columbus Sump Pump Pilot Program
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1 Flow Monitoring of Blueprint Columbus Sump Pump Pilot Program Fang Cheng, PhD, PE, Dave Bukovac City of Columbus Department of Public Utilities Division of Sewerage and Drainage 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 1
2 Acknowledgement Mike Griffith, PE, John Rubadue, Kevin Abrigg, Matt Panko, 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 2
3 Outline Background Objectives Flow Monitoring Equipment Preliminary Results Lessons Learned 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 3
4 Sump Pump Program One of the four pillars of Blueprint Columbus Program Voluntary Goal is to reduce private source I/I Plan to install sump pumps in 25% of homes within Blueprint area No direct cost to home owners Prior to full scale implementation, a pilot sump pump project was performed 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 4
5 Sump Pump Pilot Public outreach team solicited volunteers Installation started in Oct ~110 sump pumps installed Average cost of $6,000 per sump pump including discharge piping 29 sump pumps are monitored Plan monitoring for minimum 12 months per site 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 5
6 Objectives of Flow Monitoring Quantify sump pump effectiveness Quantify Inflow/Infiltration reduction of sump pump installation How to improve sump pump effectiveness regular sump pit vs. deeper pit How many sump pump do we need to install? 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 6
7 Regular Pit (22 ) vs. Deeper Pit (30 ) Started with only 22 pit Early 2017, 30 pits began to be installed If foundation drains tie into floor drain 22 pit If no foundation drains tie into floor drain Excavate outside near 4 by 6 transition to locate external foundation drains If no external foundation drain, install 30 pit inside If external foundation drain exists, pipe it to a 30 pit inside 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 7
8 Monitoring Equipment Water meter (totalizer) installed on discharge pipe $200 / meter No time stamp No remote access ability Data retrieval by physical access, phone, and text from residents 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 8
9 Monitoring Equipment Sump pit float switch $20 /switch Positioned in between pump on/off water level Each switch closure sends a electric pause to data logger recording one pump cycle 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 9
10 Monitoring Equipment and Technology Retired ADS Flowshark data logger No additional cost Wireless communication enabled 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 10
11 Progression of a sump pump install. Ohio Basement Authority (OBA) digs the pit. 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 11
12 OBA installs the well. We are using pits of 22 and 30 depth. 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 12
13 OBA prepares submersible pump for install into pit. Note float switch position. 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 13
14 Submersible pump lowered into pit. 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 14
15 Complete install, showing discharge piping, inline ZPM water meter, backup battery, and float switch data logger. 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 15
16 Discharge pipe to be laid from home to curb. 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 16
17 Float switch, made by Wayne Pumps. Switch opens as float rises with water level. When pump kicks on, float falls causing switch closure. Data logger reads and time stamps the switch closure. 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 17
18 The data logger is a retired ADS Flowshark meter using the rain gauge port to count the float switch closures. Meters are programmed in five minute interval. 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 18
19 Sample Float Switch Data The big storms on 7/10 and 7/13 greatly impacted the pump cycling at this location. The data logger is programmed as a rain gauge, it displays the switch closures as tipping bucket tips. 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 19
20 The float switch data alone was not giving us enough information on what was going on in the pits. We began installing retired ADS depth/pressure sensors into the pits as well. Sensors are attached to 1 pvc pipe and mounted at the bottom of the pit. 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 20
21 This image cannot currently be displayed. Sample data from a location with both the float switch and pressure sensor installed. Working well. 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 21
22 This image cannot currently be displayed. Sump Pump Flow Monitoring Periods 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 22
23 Preliminary Results Water Meter Pump discharge volume was normalized by total rainfall between the installation and date of reading 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 23
24 This image cannot currently be displayed. Sump Pump Discharge Volume per Inch of Rainfall 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 24
25 This image cannot currently be displayed. Float Switch with Data Logger Each pump cycle discharges 3-5 gal of water < 10 secs to drain the sump Filling time varies greatly by site and by storm 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 25
26 This image cannot currently be displayed. Float Switch Challenges Not correlated with water meter readings Switch could be stuck in one position 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 26
27 Solution - Depth Sensor Depth sensors were installed in 8 sites started June, 2017 Discharge volume can be calculated accurately More detail information on how sump is filled and emptied 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 27
28 This image cannot currently be displayed. 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 28
29 Sump Pump Peak I/I reduction - July 13, 2017 Event 1.94 over 1.5 hours Between 10-year to 25-year storm Flow meter Clintonville_0342 Peak flow 1.1 MGD 157 parcels 31 sump pumps installed 4 sump pumps monitored 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 29
30 This image cannot currently be displayed. 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 30
31 This image cannot currently be displayed. Sump Pump Discharge Peak Occurred at the same time 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 31
32 This image cannot currently be displayed. What is the sump pump peak discharge? Average 1.9 gpm 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 32
33 This image cannot currently be displayed. Most effective site : 6 gpm 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 33
34 This image cannot currently be displayed. This image cannot currently be displayed. How Much Peak I/I Can Sump Pump Reduce? Total sump pump discharge = peak discharge rate * Number of pumps 1.9 gpm * 31 = 60.1 gpm Sump pump peak I/I reduction = Total sump pump discharge/(monitored peak I/I +Total sump pump discharge) 60.1 gpm/(1.03 mgd gpm) = 7.8% 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 34
35 How Many Sump Pumps Do We Need? With average 1.9 gpm and 25% Sump Pump, I/I peak reduction is 9.7% 365 sump pumps per 1 MGD I/I reduction 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 35
36 Conclusions Sump pump results are promising More storms will be analyzed to confirm the effectiveness Deeper sump pits are more effective We could develop a specific target number of sump pumps needed for each Blueprint Area Lessons Learned Water meter without time stamp can be misleading Remote access if possible Depth sensor is most reliable 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 36
37 Questions? Fang Cheng, Dave Bukovac, 8/17/2017 Flow Monitoring of Blueprint Columbus Sump Pump Pilot 37
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