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2003-01-29_REVISION - M1998014
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2003-01-29_REVISION - M1998014
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Last modified
6/15/2021 2:56:04 PM
Creation date
11/21/2007 9:26:31 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1998014
IBM Index Class Name
Revision
Doc Date
1/29/2003
Doc Name
Amendment Application
From
DMG
To
Lafarge West Inc
Type & Sequence
AM1
Media Type
D
Archive
No
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~~ <br />DO NOT USE THIS TABLE ALONE. US <br />IN CONJiJNCTION WITH FIGURES "C-2" A "C-3"t <br />cover Description <br />Cover Type and flydrobgic Condition <br />Fully developed urban arear (vegetation estabbshedJ <br />~t space (lawn4 Park4 golfcwnser, cemetenes, etc.y: <br />Poor condition (gees cover G SO%) .............................. <br />Fav conddi[ion (goes cove SO%to 75%) .......................... <br />Good condition (grass cover> SO°k) ............................. <br />Lnpervious areas: <br />Paved parking lots, roofs, driveways, etc. (excluding rightof--way) ..... <br />Sleets and roads: <br />Paved; verbs and slam sewers (excluding rigbtof--way) ........ . <br />Paved; open ditches (including righ[of--way) .................. <br />Dirt (including righlof--way) ............................... <br />Weslem desert urban areas: <br />Natural desert landscaping (pervious areas only)' .............. <br />Artificial desert landuaping (vnpervrous weed tamer, desert shmb <br />with I- l0 2-inch sand a gravel mulch and basin borders) ....... . <br />Urban districts: <br />Conunercial and business ................................ . <br />truhtstrial .............................................. <br />Residerdial districts by average lot siu: <br />1/8 acre a less (town houses) .............................. <br />1/4 sere ................................................ <br />1/3 sae ................................................ <br />I/2 sae ................................................ <br />1 acre ................................................. <br />2 acres ................................................ <br />Developing urban areas <br />Newly graded areas (pervious areas ody, rro vegetation)' <br />Idle lands (CNe ere determined using <br />Average I Curve Num~ for Aydrologk SoD Croup <br />Percent <br />mpervioos ~ p ~ C D <br /> 68 <br />49 <br />39 <br />98 <br />98 <br />83 <br />76 79 <br />69 <br />6t <br />98 <br />98 <br />89 <br />~ 86 <br />79 <br />74 <br />98 <br />98 <br />92 <br />89 89 <br />84 <br />80 <br />98 <br />9% <br />93 <br />91 <br /> 72 82 87 89 <br /> 6 <br /> 3 77 85 88 <br /> 96 % % 96 <br />85 ~ 89 92 94 95 <br />72 81 88 91 93 <br />65 77 85 90 92 <br />38 61 75 83 87 <br />30 57 72 8l 86 <br />25 54 70 80 83 <br />20 51 68 79 84 <br />12 46 65 77 82 <br /> 77 86 9l 94 <br /> 68 79 86 89 <br />'Average runoff cnditiou (ARC = II), and Ir = 0.28. <br />'The average percent impervious area showu was used to develop the composite CNs. Other assumptions are ss follows: <br />impervious areas are directly connetled to the drainage system, impervious areas have a CN of 98, and pervious areas are <br />considered equivalent to open space in good hydrologic condition. CNs for other combinations of conditions may be computed <br />using Figure "C-3A" or "C-3B". See Figure "C-2" for more direction <br />rCNs shown are equivalent to those of pasture. Composite CNs may be computed for other combinations of open space cover type. <br />'Composite CNs for natural desert landscaping should be computed using Figures "C-3A" or "C-3B" based on the impervious <br />area percentage (CN= 98) and the pervious area CN. The pervious area CNs are assumed equivalent to desert shrub in poor <br />hydrologic coaditiou. <br />'Composite CNs to use for the design of temporary measures during grading and construction should be computed using Figures <br />"C-3A" or "C-3B", based on the degree of development (impervious area percentage) and the CNs for the newly graded perviou: <br />Breen <br />SCS CURVE NUMBERS: <br />Preliminary Values for Urban Areas <br />TABLE "C-2a" <br />C-10 <br />DEC 1994 <br />
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