As the urban population increases, so does the area of irrigated urban landscape. Summer water use in urban areas can be 2-3x winter base line water use due to increased demand for landscape irrigation. Improper irrigation practices and large rainfall events can result in runoff from urban landscapes which has potential to carry nutrients and sediments into local streams and lakes where they may contribute to eutrophication. A 1,000 m2 facility was constructed which consists of 24 individual 33.6 m2 field plots, each equipped for measuring total runoff volumes with time and collection of runoff subsamples at selected intervals for quantification of chemical constituents in the runoff water from simulated urban landscapes. Runoff volumes from the first and second trials had coefficient of variability (CV) values of 38.2 and 28.7%, respectively. CV values for runoff pH, EC, and Na concentration for both trials were all under 10%. Concentrations of DOC, TDN, DON, PO4-P, K+, Mg2+, and Ca2+ had CV values less than 50% in both trials. Overall, the results of testing performed after sod installation at the facility indicated good uniformity between plots for runoff volumes and chemical constituents. The large plot size is sufficient to include much of the natural variability and therefore provides better simulation of urban landscape ecosystems.
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机译：随着城市人口的增加，城市灌溉面积也随之增加。由于对景观灌溉的需求增加，城市地区的夏季用水量可能是冬季基线用水量的2-3倍。不适当的灌溉做法和大量降雨事件可能导致城市景观径流，这有可能将养分和沉积物带入当地的溪流和湖泊中，从而可能导致富营养化。建造了一个1,000 m 2 设施，其中包括24个单独的33.6 m 2 田地图，每个田地图都可用于测量随时间变化的总径流量并在选定的时间间隔收集径流子样本模拟城市景观中径流水中化学成分的定量分析。第一次和第二次试验的径流量的变异系数（CV）值分别为38.2和28.7％。两项试验的径流pH，EC和Na浓度的CV值均低于10％。 DOC，TDN，DON，PO4-P，K + ，Mg 2 + 和Ca 2 + 的CV值小于50在两个试验中的百分比。总体而言，草皮在工厂安装后进行的测试结果表明，地块之间径流量和化学成分具有良好的一致性。较大的样地面积足以包含大部分自然变化，因此可以更好地模拟城市景观生态系统。
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