Simple reservoir model

This simple reserovir model simulates regulated streamflow in a grid-based river network, given naturalized flow (RVIC routed flow). The model simulate reservoir operation at each dam based on:
    - rule curve
    - reservoir capacity
    - reservoir bottom pool storage
    - Minimum allowed release
    - Maximum allowed release

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# Usage
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./scr/reservoir_network.py <config_file>

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# File Structure
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[scr] - source script for reservoir modeling

[input_example] - example of input files for reservoir modeling
    * reservoir_network.Tennessee.max_flow_exceed0.1.cfg
        - Config file example
    * reservoir_to_model.max_flow_exceed0.1.csv
        - Reservoir info csv file example
    * dam7_Douglas.txt
        - Rule curve info example

[tools]
    * determine_max_flow_dams_fromUSGS_TVA.py
        - Determine maximum allowed release at each dam from USGS and TVA pass-through data
    * determine_max_flow_dams_fromRVICflow.py
        - Determine maximum allowed release at each dam from RVIC simulated flow