Relationship between Curve Number and ϕ-Index

Karpathy, Nicholas S.; Chin, David A.

doi:10.1061/(asce)ir.1943-4774.0001426

Cited by 7 publications

(2 citation statements)

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“…The CN method is also applied in incremental rainfall amounts with an associated watershed unit-hydrograph to estimate runoff hydrographs (Chin, 2021). The CN method was not originally intended to be used in incremental rainfall amounts less than the duration of the 24hour rainfall (Karpathy & Chin, 2019). Here, we referred to this as the INCremental RAinfall-RUNoff (INCRARUN) approach.…”

Section: Introductionmentioning

confidence: 99%

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Curve number for runoff estimating in interlocking concrete pavement

Lucas

Jodas

Bertotto

et al. 2022

RBRH

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Curve Number (CN) values estimating from rainfall-runoff data is an attractive topic in hydrology. However, CN values are lacking for Interlocking Concrete Pavement (ICP) material, mainly when seated over bare soil (not over a permeable pavement structure). Here, we compute CN values for the ICP seated over clayey soil using measured rainfall and infiltration capacity data. We estimated runoff ( Q) using 32 events of 24-hour rainfall depth ( P 24) and an infiltration model, assuming a hortonian runoff process. To estimate the CN for each P 24 event, we used the rainfall-runoff incremental approach. Overall, we obtained CN values ranging from 52 to 63. The best CN values to estimate Q were equal to 52.2 ( R M S E = 9.09 mm and R 2 = 0.03) and 60.1 ( R M S E = 1.45 mm and R 2 = 0.97), considering natural- and rank-ordered P 24- Q data, respectively. Our results indicate that it is more suitable to use the initial abstraction ratio ( λ) equal to 0.20 for the ICP material. The findings provide a better understanding of the rainfall-runoff process in ICP and help improve the design of stormwater drainage systems.

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Section: Introductionmentioning

confidence: 99%

“…On the other hand, the typical application of the CN method in incremental time intervals results in infiltration that exceeds the watershed's infiltration capacities (Chin, 2021). A detailed relationship between the infiltration model and the CN method is presented by Lal et al (2017) and Karpathy & Chin (2019).…”

Section: Introductionmentioning

confidence: 99%