FLOOD09697

• County: Statewide
• Community: Nationwide
• Basin: Statewide
• Title: Mathematical Modeling of a Sociological and Hydrologic Decision System
• Date: 6/1/1978
• Prepared By: Institute for Social Science Research on Natural Resources, Utah State Univ.
• Floodplain - Doc Type: Educational/Technical/Reference Information

2. For each block, calculate Ihe
percentage impervious area for
each type of surface.
3. Average the resulls over all the
blocks to obtain a mean imper,
vious area for residential houses
including garage roofs, driveways,
and home sidewalks. In this
study the average area of imper-
vious cover associated with a
single residenlial house was de-
lermined to be approximately
2400 square feet.
4. In the same manner, average val-
ues are eslimaled for the widths
ofresidential slreets and thorough-

fares. Freeways and main high.
ways are considered on an indi-
vidual basis.
B. Divide the subzones (Figure 2.2) in-
to smaller spalia! units (Figure 2.4)
based on the following crileria:
I. Thallhe amount of impervious
cover and its distribution are
nearly homogenous within a
ooil.
2. That a geomelric COllier of the
unit, and from which all runoff
from Ihe ooil mighl be consid-
ered to originale, can be assigned
by visual inspection.

/

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+1 ..../ A 12113';;:16- A2 I A6
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I A IA3 I A 5
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Wasatch Notional
Forest

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:Q)
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Figure 2.4. Division of Mill Creek and Big Cottonwood Creek subzones into smaller spatial units.

17