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Conservation of Mass in Moving, Nondeforming Control Volume01:14

Conservation of Mass in Moving, Nondeforming Control Volume

Stormwater detention basins are essential in managing runoff during heavy rainfall, particularly in urban areas where impervious surfaces increase the risk of flooding. Understanding the conservation of mass in these systems allows engineers to optimize basin performance, balancing inflow, outflow, and water storage.
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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Related Experiment Video

Updated: Jun 13, 2026

Vegetated Treatment Systems for Removing Contaminants Associated with Surface Water Toxicity in Agriculture and Urban Runoff
08:49

Vegetated Treatment Systems for Removing Contaminants Associated with Surface Water Toxicity in Agriculture and Urban Runoff

Published on: May 15, 2017

Rainwater utilization and storm pollution control based on urban runoff characterization.

Mulan Zhang1, Hao Chen, Jizhen Wang

  • 1State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. zhangmulanmine@yahoo.com.cn

Journal of Environmental Sciences (China)
|April 20, 2010
PubMed
Summary

Urban runoff pollutant loads, including chemical oxygen demand (COD) and total suspended solids (TSS), vary by area type and source. Treating initial rainfall separately is key for effective rainwater utilization and storm pollution control.

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Last Updated: Jun 13, 2026

Vegetated Treatment Systems for Removing Contaminants Associated with Surface Water Toxicity in Agriculture and Urban Runoff
08:49

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10:35

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Area of Science:

  • Environmental Science
  • Urban Hydrology
  • Water Resource Management

Background:

  • Urban runoff significantly impacts water quality and the feasibility of rainwater harvesting.
  • Understanding pollutant characteristics in different urban functional areas is crucial for effective water management.
  • Zhengzhou City, facing water shortages, requires optimized strategies for rainwater utilization and storm pollution control.

Purpose of the Study:

  • To investigate urban runoff characteristics and their influence on rainwater utilization and storm pollution control.
  • To quantify pollutant loads (COD and TSS) in different functional areas (industrial, commercial, residential) and from different sources (roof, road).
  • To determine optimal initial rainfall volumes for separate collection and treatment.

Main Methods:

  • Sampling and analysis of urban runoff in industrial, commercial, and residential areas of Zhengzhou City.
  • Measurement of pollutant loads, specifically chemical oxygen demand (COD) and total suspended solids (TSS).
  • Correlation analysis between pollutants and assessment of biodegradation capacity (BOD5/COD ratio).

Main Results:

  • Pollutant loads followed the order: industrial area > commercial area > residential area.
  • Road runoff exhibited higher COD and TSS concentrations than roof runoff within the same area.
  • First flush effects were observed, necessitating separate treatment of initial rainfall volumes (e.g., 2-10 mm for roofs, 4 mm to all for roads, varying by area).

Conclusions:

  • Separate collection and treatment of initial rainfall are essential for cost-effective rainwater utilization and pollution control.
  • A treatment system combining sedimentation and soil-slag filtration effectively removes over 90% of pollutants.
  • Findings provide a basis for developing improved rainwater management strategies in water-scarce urban environments.