AppendixF

• Basin: Statewide
• Title: SWSI Phase 1 Report - Appendix F
• Date: 11/15/2004
• Author: CWCB
• SWSI - Doc Type: Final Report

requirements can vary with month of the year (for monthly timestep simulations). Finally,
annual or monthly evaporation rates (either as inches per day or percent volume) must be
estimated and input here.
For a reach source, the only input requirements (if applicable) are minimum instream
flow constraints (which can vary by month) and average annual reach loss. This latter
parameter represents net losses of water from the reach not associated with meeting
supply demands (e.g. seepage to underlying aquifers).
For each alternative selected, a new input sheet is displayed (named accordingly). For the
conservation alternative, the input requirements are the percent reductions in indoor vs.
outdoor usages (either by month or annual average). The user also has the option of
implementing conservation only during low flow/storage periods. A check box is selected
and the user must subsequently input either the minimum reservoir volume or the
minimum reach flow that activates the conservation.
For the reuse alternative, the exchange reuse percentage (for multiple uses) and the
recapture reuse percentage (for irrigation only) are both required inputs. These values
represent the percentage of available water that is reused under the two types of
programs, respectively. The combined percentage cannot exceed 100%. Water available
for reuse, as detailed in Section 3, is the non-CU water for which there are consumptive
use credits. The percent return flows associated with each reuse type are also required
(i.e. the amount of water reused that gets returned).
For the ag lands transfer alternative, the user must specify the acres of lands to be retired,
the net annual consumptive use associated with those acres, the irrigation efficiency of
the farms, and monthly distribution percentages. The irrigation efficiency is the ratio of
the farm consumptive use to the water supplied at the farm headgate. In other words, it
represents the efficiency of the farmer's irrigation system (how much water is needed
compared to how much is actually consumed by the crops). Monthly distribution
percentages provide the monthly breakdown of delivered flow from the ag lands transfer.
In other words, seasonal variation in the amount of water available from the transfer can
be specified here.
For the non-ag water acquisition, the only input requirement is the total annual volume of
water acquired.
Current model outputs (for each timestep) are: reservoir storage (AF), reservoir overflow
(AF), reservoir release (AF), reach flow (cfs), delivered water (i.e. demand met) (AF),
shortage (demand - delivered water) (AF), net downstream return flow (AF), and total
reused water (AF). The model also provides summary statistics (average, minimum, and
maximum) for each output parameter.