TY - JOUR
T1 - Storm-water management using street sweeping
AU - Kang, Joo Hyon
AU - Debats, Stephanie R.
AU - Stenstrom, Michael K.
PY - 2009
Y1 - 2009
N2 - Although street sweeping is commonly regarded as a cost-effective storm-water best management practice, there is little quantitative evidence that street sweeping directly improves runoff water quality. In this paper, several previous street sweeping studies were reevaluated using statistical power analysis. Two-group, independent-sample one-sided t -test power analyses were performed using log-transformed event mean concentrations (EMCs) of total suspended solids, suspended sediment concentration or chemical oxygen demand. The effect size between the two groups was estimated using the sweepers' pickup efficiency, which showed that the failure to detect the difference between mean EMCs of the two sample groups (i.e., unswept and swept groups) is likely due to limited sample numbers. Too few samples, which also resulted in a high coefficient of variation, were analyzed to detect the likely difference between swept and unswept observations. In addition, the temporal gap between street sweeping and subsequent storm events was not controlled to improve statistical power.
AB - Although street sweeping is commonly regarded as a cost-effective storm-water best management practice, there is little quantitative evidence that street sweeping directly improves runoff water quality. In this paper, several previous street sweeping studies were reevaluated using statistical power analysis. Two-group, independent-sample one-sided t -test power analyses were performed using log-transformed event mean concentrations (EMCs) of total suspended solids, suspended sediment concentration or chemical oxygen demand. The effect size between the two groups was estimated using the sweepers' pickup efficiency, which showed that the failure to detect the difference between mean EMCs of the two sample groups (i.e., unswept and swept groups) is likely due to limited sample numbers. Too few samples, which also resulted in a high coefficient of variation, were analyzed to detect the likely difference between swept and unswept observations. In addition, the temporal gap between street sweeping and subsequent storm events was not controlled to improve statistical power.
KW - Best Management Practice
KW - Runoff
KW - Statistics
KW - Stormwater management
KW - Streets
KW - Urban areas
UR - http://www.scopus.com/inward/record.url?scp=67650812328&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)0733-9372(2009)135:7(479)
DO - 10.1061/(ASCE)0733-9372(2009)135:7(479)
M3 - Article
AN - SCOPUS:67650812328
SN - 0733-9372
VL - 135
SP - 479
EP - 489
JO - Journal of Environmental Engineering (United States)
JF - Journal of Environmental Engineering (United States)
IS - 7
ER -