2013-08-08_HYDROLOGY - M1977306

• Permit No: M1977306
• IBM Index Class Name: HYDROLOGY
• Doc Date: 8/8/2013
• Doc Name: RESPONSE TO GENERAL STORMWATER COMMENTS
• From: OPERATOR
• To: DRMS
• Email Name: DMC
• Email Name: TC1
• Media Type: D
• Archive: No

w"A * , -
2-5
Table 2-2.--Runoff curve numbers for selecte6 agricultural, suburban, and
-urban land use. (Antecedent moisture condition 11, wid I;a = 0-2S)
ai For a more detailed description of agricultural land txse curve xt=bers refer to
Nattcm-3 Engineering Uandbook, Section 4, WdroloQr, Chapter 9, Aug. 1972.
of Goon cover is protected trams grazing and litter and brtmh cover soil.
Cux-ve nubdwre are computed assuming the ruanl- from the house and drivevW
JE directed vowards the street with a min 'Unn of root' water directed to lawns
vhere additiousa innItrelAon could occur.
The retwinlog pervious areas Uw*u) are considered to be in good pasture condition
for these curve mmibers.
V In some y climates of the country a curve nunber of 95 mAy br- used.
Or=
HYDROLOGIC SOIL r.ROL'3>11
LW USE DESCFI?TIOE
Cultivated lfiAdil; vithout conservation treatment
72
R;,
RB
91
vIth conservation treatment
62
71
75
'5
Fr-stt=e or r land: poor condition
96
W
P�
good condition
39
�79
61
74
80
Meadow* good condition
3C
58
71
V3
Wood or Forest lu&ti- thin zt4&d, poor co-rer, rte > =ulah
45
66
77
83
good care-21
215
55
70
77
OP— SPsces, 1-nz. Wks, gull aoursea, i:earterjeu, etc.
good condition.- grass cover on 75% or more 7'f -.he s-Ps.
19
Cl
74
50
rair condition; grass cover on 30% to 75% of Ut area
49
£9
-rg
84
Commercial and business axe" (85% inpervio=0
89
92
0
95
Industr:La,L districts (72% Saperviouz)•
61
50
91
91
Average lot size Average % Imperv-ious!/
119 acre or IWW. 65
TT
85
go
91,
1/4 acre 38
61
75
83
87
1/3 acre 30
57
72
al
86
112 acre 25
54
To
80
85
I acre 20
51
63
79
all
ft"d perking lots, roofs, drivevgWs. eite.!I
98
98
98
")a
"trewts and rQa&.
paved 'with curbs and store sewerall
98
98
98
98
gravel
76
85
89
Ri
dirt
72
82
87
89
ai For a more detailed description of agricultural land txse curve xt=bers refer to
Nattcm-3 Engineering Uandbook, Section 4, WdroloQr, Chapter 9, Aug. 1972.
of Goon cover is protected trams grazing and litter and brtmh cover soil.
Cux-ve nubdwre are computed assuming the ruanl- from the house and drivevW
JE directed vowards the street with a min 'Unn of root' water directed to lawns
vhere additiousa innItrelAon could occur.
The retwinlog pervious areas Uw*u) are considered to be in good pasture condition
for these curve mmibers.
V In some y climates of the country a curve nunber of 95 mAy br- used.
Or=