Propagate NaN from curve_number in curve_number_runoff (#1104)#1105
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brendancol merged 1 commit intomasterfrom Mar 31, 2026
Merged
Propagate NaN from curve_number in curve_number_runoff (#1104)#1105brendancol merged 1 commit intomasterfrom
brendancol merged 1 commit intomasterfrom
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The NaN fixup only checked np.isnan(p), missing NaN in the curve number raster. When CN is NaN, P > NaN is False, so np.where wrote 0.0 instead of NaN. Now checks both p and cn in all three backends.
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Summary
Fixes #1104.
curve_number_runoffreturned 0 instead of NaN when thecurve_numberraster had NaN cells. The NaN fixup only checkednp.isnan(p)(rainfall), missingnp.isnan(cn). When CN is NaN,P > NaNis always False, sonp.wheretook the else-branch and wrote 0.0.Fixed in all three backend functions (
_cn_runoff_numpy,_cn_runoff_cupy,_cn_runoff_dask) to check bothpandcnfor NaN.Test plan
test_cn_runoff_nan_curve_number_1104: NaN curve number produces NaN, valid CN produces valid runofftest_flood.pysuite: 82 passed