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Chapter 8

URBS 150 Chapter Notes - Chapter 8: Total Maximum Daily Load, Hydrograph, Surface Runoff

Course Code
URBS 150
Raymond Asomani- Boateng

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Jordan Petryniec
Raymond Asomani-Boateng
URBS 150: Ch. 8
21 March 2017
URBS 150: Chapter 8 of Seven Rules of Sustainable Communities: Invest in Lighter, Greener, Cheaper,
Smarter Infrastructure (5 points)
1. According to the chapter, how does road and storm water infrastructure impact homeowners
and cities?
a. Road and storm water infrastructure often destroys the ecological function of the land
that supports it and burdens homebuyers and taxpayers through its cost to install,
maintain, and replace. Since the end of WWII, the per dwelling unit costs for providing,
maintaining, and replacing infrastructure has increased by nearly 400%.
2. According to the chapter, how does road and storm water infrastructure interfere with the
ecological function of the land?
a. Pavement fundamentally alters where water goes when it rains. Water that should go
into the ground goes into pipelines or rivers instead, which can contaminate our
freshwater and drinking water
3. Outline four (4) benefits of a canopy cover of riparian vegetation along stream corridors. What is
the minimum feet of streamside vegetation required to maintain a healthy riparian corridor of a
a. At least 100 feet is required to maintain a healthy riparian corridor
b. Roots and fallen trees reduce the energy of flowing water, which in turn, helps to secure
streamflow and stabilize them
c. Riparian plants hold soil in place and trap moving sediment, replacing soil and reducing
d. Vegetation filters surface runoff and slows overload flow during times of rising flood
e. Stored groundwater is released back into the stream during periods of dry weather to
help maintain a minimum base flow
4. Which act governs and regulates water quality in the United States? What are its goals and how
have these goals changed over the years?
a. The Clean Water Act is still the only regulation governing U.S. water quality, and all 50
states hae aliged poliies ith it. The goals of the at are to protet Aeria’s
waterways, and to keep all U.S. water swimmable and fishable.
b. The act has ee updated y addig the TMDL rule (total maximum daily load of
suspended solids), which can address stream degradation by regulating siltation.
5. State and explain the four (4) rules of infiltration
a. Infiltrate, Infiltrate, Infiltrate: if all the rainwater that falls on the site could go into the
ground, then the predevelopment hydrograph is emulated. If this can be fortified by a
robust planting strategy for streets, yards, and, at certain densities, rooftops, then the
predevelopment hydrograph can be nearly matched.
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