Back to Search
Start Over
Predicting the existence of stormwater first flush from the time of concentration
- Source :
- Water Research. 42:220-228
- Publication Year :
- 2008
- Publisher :
- Elsevier BV, 2008.
-
Abstract
- Simulations were performed using a one-dimensional kinematic wave model to examine the relationships between the time of concentration (T(c)) and the first flush (FF) for impervious landuses. The model used chemical oxygen demand parameters from a highway runoff site in west Los Angeles for eight storm events. FF indices such as the mass first flush ratio (MFF(n)) and the partial event mean concentration to event mean concentration ratio (PEMC(t)/EMC) were calculated from simulations using various rainfall intensities, rainfall durations, bed slopes, and watershed lengths (L), and matched measured values with an RMS error of 25% for six events. Resulting values of MFF(20) and PEMC(60)/EMC were correlated to T(c) calculated using ASCE's kinematic wave formula, and showed a non-monotone relationship, with very short or long T(c) having low MFF(20) with a maximum for mid-range T(c). Contours of the MFF(20) and PEMC(60)/EMC were created to predict and quantify FF from known T(c), L, and rainfall duration (T).
- Subjects :
- Hydrology
Environmental Engineering
Rain
Ecological Modeling
Stormwater
First flush
Transportation
Soil science
Models, Theoretical
Los Angeles
Pollution
Concentration ratio
Kinematic wave
Water Movements
Surface runoff
Waste Management and Disposal
Root-mean-square deviation
Time of concentration
Water Science and Technology
Civil and Structural Engineering
Mathematics
Subjects
Details
- ISSN :
- 00431354
- Volume :
- 42
- Database :
- OpenAIRE
- Journal :
- Water Research
- Accession number :
- edsair.doi.dedup.....6ab17fbbc29525dd2e0ccd5a4b5da394