This paper studies soil-erosion problem around cracked sewer pipes, which is usually associated with groundwater infiltration in systems. Four factors (soil-particle size, defect water head, and soil height) that are the erosion process were investigated experimentally. Two experimental setups used: a cylindrical bin circular outlet at bottom center to simulate rectangular box on side wall show internal process. The quantitative influences of four erosion-void shape, volume, length analyzed....

As sewer pipes age, groundwater and the surrounding soil can enter into system through various defects on pipe wall. Groundwater infiltration erosion cracked result in increased sewage loading cause sinkhole problems. A reliable model is needed to assess water rates. By incorporating related resistances during process, this paper presents improved expressions for calculating rates crack a pipe. Good agreement between experimental predicted results rate obtained. The analytical models...

Understanding hydrogen sulfide (H2S) emission into sewer air space and the rate of ventilation to atmosphere is important in preventing/mitigating odor corrosion problems systems. This study presents results a field monitoring program on pressure H2S levels 3-km-long sanitary system Edmonton, Alberta, Canada, which has drop structures upstream section pump station downstream section. Nineteen manholes were monitored, including six structures. A positive correlation was found between sewage...

Abstract The quick‐view (QV) technique serves as a primary method for detecting defects within sewerage systems. However, the effectiveness of QV is impeded by limited visual range its hardware, resulting in suboptimal image quality distant portions sewer network. Image super‐resolution an effective way to improve and has been applied variety scenes. research on images remains considerably unexplored. In response, this study leverages inherent depth relationships present introduces novel...

Estimating groundwater infiltration into sewer systems is important for wastewater treatment operators and municipalities. This paper presents an approximate solution steady-state through line defects. The table was assumed to be horizontal the aquifer homogeneous isotropic. Mobius transformation technique equivalent circumference method were introduced solve governing equation. rate found controlled by hydraulic conductivity of surrounding soil, total head above pipe, size position defect, defect.

Abstract The City of Edmonton has been suffering from sewer odour problem for many years. Ten years complaints data 2008 to 2017 were statistically analyzed identify major factors that relate the problem. Spatial and temporal distributions in city first presented. Then relationships between physical attributes systems by introducing a parameter risk index. It was found snowmelt storm events could possibly reduce complaints. Old pipes large drop structures are more linked thus significantly...

Untreated water can intrude into distribution systems through pipe cracks and/or openings when negative pressure events occur inside drinking pipelines. It is important to determine the magnitude of possible intrusion event. To estimate flow rate more accurately, effects surrounding soil must be considered. In this paper, an analytical relationship derived by combining seepage in and orifice for predicting a circular under steady-state conditions. The effect pipeline on reducing area...

Abstract An analytical solution was proposed for the groundwater flow through a defective pipe, which can be used to estimate water rate into pipe and predict pore pressure distribution in surrounding soils. This verified by comparing with experimental results, predicted around is proved consistent numerical simulations using finite element method. From parametric analysis, infiltration increases as defect position changes from top bottom on effect of not significant if head above 10 times...

Abstract Previous studies on the extraneous water problem (or infiltration/inflow) in sanitary sewer systems assumed that wastewater flow is mainly composed of foul sewage (FS), groundwater infiltration (GWI) and rainfall-derived inflow (RDII). Most existing assessment methods are based this assumption. In 2018, China initiated ‘Protection Yangtze River Program’, two-year research data showed it was neither GWI nor RDII but direct surface intrusion (DSWI), which has rarely been reported...

Abstract This study investigates the geometric modelling of architectural heritage digital twins constructed based on multi-source point cloud data and its effectiveness in structural reinforcement assessment. Particular emphasis has been placed use static stiffness rules to identify areas weakness models need for their reinforcement, order prevent potential problems ensure long-term preservation built heritage. Taking Yingxian wooden pagoda as a case, collection data, twin model is through...

Groundwater infiltration through cracked sewer pipes has caused significant economic losses. This paper presents a three-dimensional analytical expression for calculating the steady-state groundwater rate into systems. As an extension of previously developed two-dimensional model by author, this new can be used to simulate orifice defect. The derived been validated with experimental results. incorporates all related resistances during process, including soil head loss and loss. is assessed...

Microplastics (MPs) can be sheltered by bed grains, resulting in a higher threshold of mobilization compared with those moving on smooth bed. Only one formula considering the sheltering effects has been proposed for critical shear stress (τc) MP including densities and sizes MPs but it is inaccurate certain materials such as PS shows limitations understanding effects. Additionally, no method exists depth-averaged velocity (Uc). In this study, experiments were conducted measuring both τc Uc...

ABSTRACTThis study establishes a refined model of wooden column members, with the aim studying more accurately force deformation characteristics members under influence aging. The service life each layer columns was predicted by calculating load-bearing capacity aging; hybrid 3D integrated triangular network and parametric established; location point where maximum displacement occurred at level second to fifth obtained through real-time monitoring system; deformations M2W23-S, M3W23-S,...

Better understanding of the hydraulic performance stormwater inlets which serve as linkage between surface drainage system and underground sewer is important to avoid urban flooding. Continuous transverse grates were not well studied in literature, and, therefore, eight types such commonly used China examined experimentally this study. A full-scale physical model simulating a 12-m-long 3-m-wide road was constructed for 320 tests with different approaching flow rates longitudinal slopes....

Abstract In sewer pipes, haze caused by the humid environment seriously impairs quality of closed‐circuit television (CCTV) images, which leads to poor performance subsequent pipe defects detection. Meanwhile, complexity such as steep depth change and extensive textureless regions, brings great challenges or application general dehazing algorithms. Therefore, this study estimates maps first with help water–pipewall borderlines produce paired dataset. Then a structure‐aware nonlocal network...

In recent years, three simple tracers (conductivity, turbidity and temperature) have shown their advantages to many other for tracing assessment of extraneous water (or inflow infiltration, I/I) into sewer systems due low detection cost high monitoring frequency. A better understanding the error uncertainty on quantification I/I will help improve reliability reduce actual projects. large-scale experimental model simulating a 36 m long was constructed conducting flow tests including...

Neural network has strong ability of pattern recognition.In consideration the problems traditional pure BP neural network, such as subjecting to randomness initial weights, slow convergence speed, low efficiency, easy fall into local extreme value, in this paper we proposing an optimal fusing with genetic algorithm using bridge health assessment.The optimized a good diagnosis effect, and improves calculation accuracy speed identification structure damage.

Combined GPRS network data transmission, the advanced GPS satellite positioning and other key technologies, an embedded vehicle intelligent monitoring system could be achieved. This paper introduced development of main device driver, application program design video capture card, GPS, GPRS. build software will help to achieve improve degree networking. With µC/OS-II real-time multi-threading technology solve problem multi-task parallel processing in system, order ensure stability,...

In order to better plan new or update sewer pipe condition assessment protocols, this paper presents systematic comparisons of four most widely-used including the fourth edition Sewer Rehabilitation Manual (SRM-4) in UK, Pipeline Assessment and Certification Program (PACP) America, Physical Condition Grading Protocols (SPCCM) Canada, Technical Specification for Inspection Evaluation Urban (TSIEUR) China. qualitative comparison, defects, deduct values methods protocols were analyzed;...