Water Resources Allocation Scheme for the Central Urban Area of Mengla County

ZHAO Xiang; LIU Ning

doi:10.3969/j.issn.1004-7328.2026.增刊1.001

Abstract：As a border hub and multi-ethnic settlement,the central urban area of Mengla County faces multiple challenges including water source quality risks,insufficient water supply capacity,and rural drinking water safety,with the contradiction between water supply and demand becoming increasingly prominent.Focusing on the development needs of 2035,this paper conducts water supply-demand analysis and allocation research,aiming to establish a safe,reliable,efficient,and intensive multi-source complementary water supply system with quality-based and categorized water distribution to support the sustainable development of towns in border ethnic areas.The per capita daily water consumption method,quota method,and land-use index method are adopted for categorized water demand forecasting.Water availability is calculated based on long-term hydrological series data.Scheme comparison and demonstration are carried out through multi-source water supply comparison,supply-demand balance analysis,quality-based water allocation,and total water use control verification.The results indicate that under the P=95%extreme dry year scenario in 2035,the total water demand of the central urban area is 19.289 million m3,while the total available water supply from existing and planned sources is 14.843 million m3,resulting in a deficit of 4.446 million m3.The Mandan Reservoir is unsuitable as a domestic water source due to unstable water quality caused by non-point source pollution.With the newly constructed Nanxihe Reservoir supplying 4.446 million m3 annually,combined with the Mandan Reservoir,Manzhang Reservoir,Nanxihe Water Diversion Project,and reclaimed water,the multi-source allocation scheme can fully guarantee all types of water demand.This scheme meets the regional total water use control requirements and is technically sound and economically feasible.