WSPC07410

• File Number: 8064
• Description: Indian Water Rights
• State: CA
• Date: 8/13/1951
• Author: Unknown
• Title: Santa Margarita Water Rights Controversy-California
• Water Supply Pro - Doc Type: Report/Study

000223

10 SANTA MARGARITA WATER RIGHT8 CONTROVERSY, CALIFORNIA

j\'IEMOH.....NDUM OF UNDERSTANDING BETWEEN TITE DEPARTMENT OF THE NAVY,
THE FALLBROOh. PUBLIC UTILITY Dr::iTRICT, DEPARTMENT OF THE ARMY, AND
THE DEPARTMENT OF THE INTERIOR

The pa.rties !lamed in the title of t.his memorandum all being con....ersant. with
the terms and provisions of the attached bill for llIl act to authorize the Secretary
of the Navy to const.ruct), maintain, alld operate a dam Rnd reservoir on the Santa.
Margarita River in the .;tate of Qalifornia and for other purposes, have reached
the following: understanding relating to the operation of said proposed dam and
reservoir when authorized and construction thereof is completed:
1. Bel;t. obtainable hydrologic data, which are accepted by the parties as the
basis for this understanding show that. a dam built'at the DeLuz site to a height
s~fficient to create a reservoir of 188,000 acre-feet active consen-nt.ion capacity
will create a reseryoir having a firm yield during its initial filling llS indicated by
the figures below:

ACtlVll r~ser- SuhS<:Quent
t'Olr content
Mllr.! firm yield
(acre-reet) (ll.cre-fcet)
0 3,400
44,000 8.000
54,000 9,000
63,000 9.800
74,000 10.800
&3,000 1l,600
94.000 12.500
93,000 12,800
116,000 14.300
]39,000 16,300
160,000 18,000
176,000 19,300
188,000 20,000

Subsequent t.o the reservoir filling to 188,000 acre-feet, the firm annual yield is
estimated to be 20,000 acre-feet at any stage of the resen-oir.
2. As between the naval reservations and the Fallbrook public utility district,
division of the waters of the Santa Margarita River and of the DeLuz Reservoir
shall conform to the following:
(a) Until such time, immediately following construction of DeLuz Dam, alJ
the reservoir attains an active cont.ent of 63,000 acre-feet,' Naval Reservations
will satisfy their basic requirement.s but not exceed a draft upon the reservoir
of 8,000 acre-feet in any year except in the ca.se of a national emergency involving
mobilizat.ionj Fallbrook would satisfy its requirements to the extent possible
v.'ithout exceeding a draft upon the river or reservoir of 1,800 a.cre-feet.
(h) ACt.er the reservoir has attained an active content of 63,000 R.cre-fp-et, and
until an active content of 98,000 acre-feet has been attained, the Naval Reserva-
tions willsll.tisfy their basic requirements but not exceed a draft upon the reservoir
of 8,000 acre-feet in any yea.r except in case of a national emergency involving
mobilization; Fallbrook would divert from the river or reservoir the difference
between the firm yield indicated in the table above, and the Naval Reservations
8,000 acre-feet.
(e) When an active reservoir content of 98,000 acre-feet is reached, the 12,800
acre-feet yield of the reservoir will have been divided, following the rule of (b),
8,000 acre-feet to the Naval Reservations except in case of a nationa.l emergency
invoking mobilization, 4,800 acre-feet to Fallbrook. These quantities represent
62.5 percent and 37.5 percent of the whole. Thereafter, and unt.il the reservoir
fills, the firm yield of the reservoir as indicated by the table above shall be divided
in that proportion.
(d) After the reservoir fills, and except in the case of National Emergency
involving mobilization, the 20,000 acre-feet firm yield would be dividedj 12,500
acre-feet t;o the Na\"al Reservations, 7,500 acre-feet to Fallbrook. Water unsued
by either party after the reservoir fills initially would accrue to the credit of tha.t
party. Credit to the United States a.nd to FaJlbrook shaH not exceed 62.5 per-
cent and 37.5 percent respectively of that part of the conservation capacity that
would be unoccupied if no credits existed to either party. When the reservoir
refills to its full conservation capacity, namely, 188,000 acre-feet, aU credits to
either patty shall become Iluli and void"

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