WSP07125

• File Number: 8278.400
• Description: Title I - Mexican Treaty and Minute 242
• Basin: Colorado Mainstem
• Date: 1/1/1989
• Author: IBWC
• Title: Minute 242 Annual Report
• Water Supply Pro - Doc Type: Annual Report

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Northerly International Boundary:

Iris data set represents the delivery to Mexico at NIB. Values of delivery
(KAY) are entered for each month. The KraNS are calculated by summing all the
KTONS to the river and the KIONS calculated for the Imperial Dam Release to
Mexico. The P/M is calculated from the KAF entered for each month and the
KTONS values calculated for each month. The annual value is the flow weighted
annual average used to calculate the annual salinity differential between
Imperial dam and NIB.

KTONS are calculated as shown below:

Northerly International Boundary CKTONS) = Wellton-tlohawk Drainage Flows to

River (KTONS) + South Gila Drainage Pump Outlet Channels to River (KTONS) +

Yl~S Mesa Conduit (KTONS) + Unmeasured Flows (KTONS) + Other Measured Flows

-
(KTONS) + Yuma Main Canal Wasteway (KTONS) + Imperial Darn Release to Mexico

(KTONS)

Annual KTONS is the sum of the monthly KTONS as calculated above.

The monthly and annual salinity (P/M) are calculated as shown below:

PIN = KTONS/KAF/O.0013584

Sal. DifNIB-IMP.:

This is the monthly and annual salinity differential between Imperial Dam and
NIB. The monthly differential is calculated as the monthly salinity at NIB
minus the monthly salinity at Imperial Dam (monthly salinity at NIB - Monthly
salinity at Imperial Dam). The annual salinity differential is calculated as
the annual salinity at NIB minus the annual salinity at Imperial Dam (annual
salinity at NIB - annual salinity at Imperial Dam).

Notes:

(1) Table 2 (run in the Yuma Projects Office) performs a detailed mass balance
(budget) of flow and salt on the Colorado River between Imperial Dam and NIB
using measured and projected values.

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