Erosion and sediment control practices are implemented during construction activities to mitigate downstream effects, but limited field-performance data exists. Field assessments were conducted to evaluate ditch check installations during highway construction in Tama County, Iowa. Data collection included daily rainfall, topographical surveys of sediment deposition, pre- and post-rain event images, and visual observations. Variations to the standard Iowa Department of Transportation silt fence ditch check installation evaluated as part of this study include: (a) upgrading non-reinforced geotextile to a multi-belted, reinforced geotextile (i.e., SF-M1); (b) installing V-shape, as opposed to linear, while incorporating wire reinforcement to support hydrostatic loads placed on the geotextile, inclusion of a weir to facilitate controlled flow discharge, and offsetting the geotextile entrenchment location to improve ground securement (i.e., SF-M2); and (c) installing the dich check as described for SF-M2 substituting slicing for trenching (i.e., SF-M3). The modified wattle installation (i.e., W-M) incorporated a teepee staking configuration to facilitate ground contact, and an excelsior underlay, secured by sod staples, to minimize wattle undercutting. Results from field experiments indicated that sediment retention rates significantly improved for installations of SF-M2 and SF-M3 when compared with the standard installation and SF-M1 at the 85% confidence level, and served as viable control measures in concentrated flow applications. The W-M installation exhibited a statistically significant improvement in sediment retention over the W-S installation at the 95% confidence level. These findings suggest that ditch check performance is a function of specified practice and of installation methods described within regulatory agency specifications and design guidelines.

在施工活动中实施了侵蚀和沉积物控制措施，以减轻下游影响，但现场性能数据有限。在爱荷华州多摩县的公路建设过程中，进行了现场评估，以评估沟渠检查装置。数据收集包括每日降雨量，沉积物沉积的地形调查，降雨前后的事件图像以及目视观测。作为本研究的一部分，对爱荷华州交通部淤泥围栏沟渠检查装置的标准安装进行了以下改动：（a）将非增强土工布升级为多带增强土工布（即SF-M1）；（b）安装V型（而不是线性），同时加入钢丝增强以支撑施加在土工布上的静水载荷，包括堰，以促进受控的流量排放，并抵消土工布的固定位置，以改善地面安全性（即SF-M2）；（c）按照SF-M2的说明安装挖沟支票，用切片代替挖沟（即SF-M3）。改进的矮木安装（即WM）采用了圆锥形帐篷结构以利于地面接触，并采用草皮钉固定的优质衬板，以最大程度地减少矮木的根切。现场实验的结果表明，与标准装置和SF-M1相比，SF-M2和SF-M3装置在85％的置信度水平下的沉积物截留率显着提高，并且在浓缩流应用中是可行的控制措施。在95％的置信度下，WM装置比WS装置在沉积物保留上具有统计学上的显着提高。这些发现表明，沟渠检查的性能是规范惯例和监管机构规范和设计指南中所述的安装方法的函数。