WSP09281

• File Number: 8407.500
• Description: Platte River Basin - River Basin General Publications - Missouri River
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 5/1/1983
• Author: MBSA
• Title: Missouri River Basin Hydrology Study - Final Report - Missouri Basin States Association
• Water Supply Pro - Doc Type: Report/Study

llil14r,~

Figure 4
Comparison of Average Historic Streamflow
and Average 1978 level Depleted Streamflow. 1944-1978
by Subbasin and the Missouri River Basin

.

. Average H,storIC SUeamlN;)w

~
~ ~
~ ~
~

~
~
I~

'"

Ayerage 1978le\t('1 Depleted Slream!~w

120 ~
~
0
~
'" ~~
mN
m
! ~~ I
BO ~
. ~
" I
<
0 I ~ ~
~ 60 ~ . . I
~ ~
" I ~
N I
'0 N
~ 0
NN [ I
20 ~ .
'--
U"",,, Western Plane- Kansas M,ssourl
M's5OUn Dakota N.obrara BasIn
't'e-llo",stone East",," MldOle Lower
Dakota M.ssoun MISSOUfl

L __

hy an additional ~.ti."l million acre-ref'! from 196f) 10
1978 Wigun' :11. A l'ompari!<on of th~. aH'ra~(> historic
stn'amflow and Ih", <l\'f'rag-t' l!Jil-i level dt'plt"ll'd
.-.trt'aml1ow for the period 194.' . 1978 by suhbaslll Bnd
for the \tissourl Hin'f basin is .~hown in FiJrUft' 4 Tht'
19,,s [(,H'I dt'plt'tf'd streamflow is btimllte.d tt) ht" 2L4:~
million aCTf'-ff-t't al Sioux (,il~' and ;;."l,()3 million IlCTl".
feet al HNmann.

In Ihe ~ltssouri Hin'r ba:<in. W<ller supply "tudib'
haH' heen made that extend nfu:k 1I:, far 8":' the \/;,90's.
.-\ftN review uf hoth watN !'upply and availahle r('("-
urd" for ag-ricultural data, it W<l5 decidt'd Ihal a guod
starting puint would he ,.omewhi're durin/;:' the 1930'"
or 19.tU';;>. H"lWeVt'T, lhfo bia" that wlIuld be introduced
into the study r{';;\llt." by including hoth the H):l(f"
drought and the I g,"J(J',.:. drought was con1iidered to ha\'{'
tou great nn impan to provide impartial re"uJt...,
Thl"Tefori'.1l periud ,.:.tarting sometime aller the 19:10'"
droug:ht wa" con"idNi'd appropriate. and .January 194.1
wa" s,{'leC'ted HOWi"\'N. in con,.:.ideration of thi" signif-
icant negati\-e impact a drought lIf that nature can
ha\'i' on a water "upply ,.:.itu8tion a.nd In anticipation

01 an.v qUt:'''tlOIl conC'l':'rning it,.:. efff'ct had it Iwen in-
c1udt"d ill lht' sllIdy. a "drought factor" rl"lationship
wa.;, dt'vt'!!,'pt'd for historical .;,t rt'llml1ow III :;elected
gaging "tat ion.::. Den'lopmenl of this factor was based
un di'tt'rmining mean tlowr;. using the 1944-19i8 and
Ihe W:l(l-l!r;b rwrind" of rt'~'ord..;,. For the ~tissouri
River al Hermann, ~li",s(luri, that factor is 0.93, in-
dicating" lht' recorded mt'an annual now during the
19:kJ-19iS periud wa~ 9:Fc of tht' m{-8n annual now
for tht' pl.'rilld 19.1.t-HliS.

Tht' ~Ii,;~ouri Ha"in :'talli';.. Association maintaim
and Ol~ratli's (hii' compu{{'rized Willer Accounting Sys-
tem de\'t']opl"d (I,.:. a part of lht' ~IRB Hydrolo~y ~tudy.
l'sli'r:' of the :'o\stf'm can ohlllin information of e:,ti-
mated "treamliow de-ple-tion" due 10 an\' number of
Wiltt'r u...es within thl' 93 defined hydrolo!:!,ic areas.
called nodt' basins. Ihnt comprise the ~Iir;.souri Ri\'er
Basin. Information Oil bistorlc dt'plf'1ion~ is "upple-
mt'ntNj, hy narrati\t' information about compactr;..
court dt'('rt"f's, and the gent'ral water right~ pwces"es
alld rwrmll law~ In t>(ft'ct in each of thf' ten ~1iswuri
Hiwr Rasin sli.ltes.