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Accueil du site → Doctorat → États-Unis → 2022 → Colorado River Sustainability in a Changing Climate : Development and Application of Sustainability Metrics for the Lower Basin States Under Drought Condition

University of Arizona (2022)

Colorado River Sustainability in a Changing Climate : Development and Application of Sustainability Metrics for the Lower Basin States Under Drought Condition

Huizar, Luis H.

Titre : Colorado River Sustainability in a Changing Climate : Development and Application of Sustainability Metrics for the Lower Basin States Under Drought Condition

Auteur : Huizar, Luis H.

Université de soutenance : University of Arizona

Grade : Doctor of Philosophy (PhD) 2022

Résumé partiel
The Colorado River is the main water source in the southern United States serving seven states and Mexico. Overallocation of the Colorado river in the original compact governing Colorado River water allocation and drought conditions over the past two decades have left the river’s reservoirs (primarily Lakes Powell and Mead) at historically low water levels, requiring the need for new administrative measures. To help maintain higher Lake Mead elevations, an initial set of strategies was established under the 2007 Interim Guidelines (2007-IG) outlined a set of penalties to Arizona and Nevada once Lake Mead levels reached 1075 ft amsl. Mexico later joined the conservation effort under Minute 319 also accepting reductions in deliveries when Lake Mead reached1075ft amsl. Rapidly decreasing lake elevations and drought conditions after the adoption of the 2007-IG motivated new legislation even before Lake Mead hit the 1075ft critical mark. The new agreement, the Drought Contingency Plan (DCP) of 2019, was developed and adopted by all seven Colorado River basin states and Mexico. The DCP increased penalties beyond those established in the 2007-IG. The DCP also added new penalty tiers beginning with reductions at Lake Mead elevations of 1090ft amsl. New penalties included reductions to California which was exempt from reductions under the 2007-IG ; it also added measures relative to conservation and allowed state to recover reductions specific to the DCP in later years if lake levels recovered. To assess the effectiveness of the DCP in comparison to the 2007-IG. sustainability, resilience, and robustness (SRR) metrics applied under conditions specific to either the 2007-IG and the DCP. Four metrics are used here as measures of DCP performance. These include functionality, sustainability, mean time to repair (MTTR) and mean time between failures (MTBF). Functionality is calculated annually and measures fractional demand delivered over the period analyzed.

Présentation

Page publiée le 28 novembre 2022