RAINFALL-RUNOFF ANALYSIS WITH EPA SWMM

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University of Wisconsin – Milwaukee
CIV ENG 411 –Fall 2015
Gabriela Santos
Lab Report #2
10/13/15
RAINFALL-RUNOFF ANALYSIS WITH EPA SWMM
INTRODUCTION
 The SWMM contains a flexible set of hydraulic modeling capabilities used to route runoff and external inflows through the drainage system network of pipes, channels, storage/treatment units and diversion structures. The objective of this lab was to learn to use SWMM through a tutorial example, using essential steps to obtain the results. A dynamic rainfall-runoff simulation model used for single event or long-term simulation of runoff quantity and quality from primarily urban areas.
PROCEDURE
 Following the tutorial, setup and run the example case with the following general
procedures, we ran the first simulation using the tutorial. It showed how to add objects to a SWMM project, also to edit the properties of these objects, how to run a single event simulation for both hydrology and water quality, and how to run a long-term continuous simulation.
RESULTS
Table 1 - Subatactchment Runoff 
	
Subcatchment
	
Total
Precip
in
	
Total
Runon
in
	
Total
Evap
in
	
Total
Infil
in
	
Total
Runoff
in
	
Total
Runoff
10^6 gal
	
Peak
Runoff
CFS
	
Runoff
 Coef
	S1
	3.54
	0.00
	0.00
	1.49
	2.04
	0.28
	7.24
	0.576
	S2
	3.54
	0.00
	0.00
	1.15
	2.38
	0.19
	5.40
	0.672
	S3
	3.54
	0.00
	0.00
	1.45
	2.09
	0.23
	6.39
	0.589
Table 2 – Node flooding
	
Node
	
Hours
Flooded
	
Maximum
Rate
CFS
	
Day of
Maximum
flooding
	
Hour of
Maximum
Flooding
	
Total
Flood
Volume
10^6 gal
	
Maximum
Ponded
Volume
1000 ft³
	J1
	0.36
	1.56
	0.00
	2:30
	0.008
	0.00
	J2
	1.54
	7.81
	0.00
	2:25
	0.140
	0.00
	J3
	0.29
	1.21
	0.00
	2:30
	0.005
	0.00
Graph 1 – Times series of flow rate
Graph 2 – Time series of lead concentration
Graph 3 – Water Surface Profile
CONCLUSION
 The software SWMM 5 has an important function to analyze data; running hydrologic, hydraulic and water quality simulations; and viewing the results in a variety of formats.