PERMFILE52028

• Permit No: C1981020A
• IBM Index Class Name: Permit File
• Doc Date: 5/13/2002
• Section_Exhibit Name: Appendix M‎(i)‎ to M‎(viiI)‎
• Media Type: D
• Archive: Yes

•
AF'F'EIVUIX M{~•ii)
MIJN!ER CAh.IYiiN MINE
Waste Roc4:: L~ispcsal =ite - _~edin~er~tati~~ri F;es~rv~!ir
A) Run-off a.r~d V~~lurrie

Determine: Ma::<:imurt~ runoff area :ind peal; discF~argee
Reser'v~!ir ~I i~;uid vr~l U~rie
Reservoir sedimer~t .plume
Total reservoir •/oium~•
Area: The tr~ti'I disturbed area '!`r•om nihi'_h surface rurn7ff sh~ial l
be confained is ~./-~ acres.
F'ei: discharn'z= - For calculating pea4:: dischar~aes usr:
"Procedures for Deterni:ninq F'eak: F1 ~~ws in
in Cc~lor~-dry", =~~i1 i::onservatir~n '=:ervi.c.=
U.:S. Di partn~ent ..f ~=lgricuiture, t•larch, 1'?=;0.
F'ri.'C1 ~lt3tlr!ri - Fr'i~Ri F1~ i - - -
F acre _:-7, F'agc-_s ,-~ .. --
Run,~i'r - Assume m~~der:ate rur~off [~c~tential f~~r area.
L!SE CtJ = _:4 (a-sutrir r=iMC = II)

1 4 ~" i...-.,~ - -
~. ~ _
Fr~~n~: T~~'t~le .-_. F'ag~= /-,4.
Feat.: DiscF~araes:
per inch ~~t run~!tt)
Aj = drainage area in square miles
~.! = rur~~aff ire ir~cY~es
q = H~%drograph co-c~rdinatc discharge in cfs
qF = csm/in ( cut~ic feet per secor~d per square mite
Assumptions: 1) Time of c~~ncentratir_~n = /-, rziin. = 0.1 hours
'~) Time of Travel = ~~

_oluti~ar~: From Tat~le S-:?, F'a~ae _-'7, q = ~~'=~1 csn~~/ire
F'
1~~ yr' - ~4 Fir F'ea4:: DiscF~ar'ge = 'a1U - 'gyp Ad u!1~r
q10 = (9'i~1 csm/in) (i~.pu41 mi`) (ir.~t= ") = 1.71 cfs
25 yr - 24.hr FeaF:: Dischar~7e = q`= _ qF Aj i'!.`
q.~~ _ ('='%1 csrr/in) (i+.OO41 mi`) (p.L-~ ") _ ~.7•_-. cfs
~J
The peak: discharges will be Used to design the inlet ditch,
the emergency spillway and the primary spillway.