FLOOD09579

• County: Statewide
• Community: Dallas, Texas
• Basin: Statewide
• Title: Effects of Urbanization on Floods in the Dallas Texas Metropolitan Area
• Date: 1/1/1974
• Prepared By: USGS, City of Dallas
• Floodplain - Doc Type: Educational/Technical/Reference Information

Table 2.--Drainage area, percentage of impervious area, and topographic characteristics of

drainage basins in the Dallas metropolitan area

,
~
~
,

imperv~ous area Coeffic~ent Topograpn~c
(percentaqe) of characteristics
Gaging Basin Drainage R7sidV Non Total Effec-- impervious- Length
station area tial residen- tive V ~e~7 Length Slope
(fia. 2) (sa mil tial (miles) (ft/mi) Yslope
(I) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)
8-556 Joes Creek 7.51 25 10 35 26 1.52 6.42 31.0 1.15
8-557 Bachman Branch 10.0 24 6 30 22 1.45 6.32 31.6 1.12
8-565 Tur tle Creek 7.98 30 17 47 37 1. 70 5.90 il28.1 1.11
8-570.2 Coombs Creek 4.75 33 10 43 31 1. 63 4.58 45.2 .68
8-570.5 Cedar Creek 9.42 34 11 45 33 1. 68 6.09 38.9 .98
8-571 White Rock Creek above 29.4 0 VI 1 VI 1. 00 13 .5 15.2 3.46
Keller Springs Road
8-571.2 Spanky Branch 6.77 0 ~/l 1 ~/l 1. 00 4.88 36.6 .81
8-571.4 Cottonwood Creek 8.50 19 11 30 23 1.45 7.04 32.1 1.24
8-571. 6 Floyd Dranch 4.17 13 13 26 21 1.39 4.84 38.6 .78
8-572 White Rock Creek above 66.4 6 4 10 8 1.15 21. 9 12.0 6.33
Greenville Avenue
-- White Rock Creek between 37.0 11 3 14 10 - - - -
Keller Springs Road and
Greenville Avenue Sf
8-573.2 Ash Creek 6.92 31 7 38 27 1.57 4.44 38.0 ,72
8-573.4 Forney Creek 1.E4 12 3 15 11 1. 22 2.72 56.4 .36
8-574.2 Fivemile Creek 13 .2 11 10 21 17 1. 32 8.22 32.1 1.45
8-574.25 Woody Branch 11.5 9 4 13 10 1. 20 6.12 40.1 .97

!/ Includes all residential zoning categories given in table 3. All other categories are nonresidential.
~ Calculated as col. 4 x 0.65 + col. 5.

~ Equation for K = 1.00 + 0.015 I, where I is total basin imperviousness from col. 6.

!/ Based on April 28, 1966, flood profile (Mills and Schroeder, 1969); many channel dams across stream.

~ Increased to 1.0 percent to account for paved roads and scattered buildings; these are rural basins.

~ Intervening subbasin; runoff from area used in report.