Bulugh al-Maram, Book 1, Hadith 99 (English)

Ahmad reported from Ibn Abbas (rad) that defecation is prohibited also at the place where water collects. [And both the two (i.e. the previous and this Hadiths) have weakness].

وَلِأَحْمَدَ; عَنِ ابْنِ عَبَّاسٍ: { أَوْ نَقْعِ مَاءٍ } وَفِيهِمَا ضَعْف ٌ (109)‏.‏ ‏3 ‏- ضعيف.‏ رواه أحمد (2715)‏.‏

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also referenced under: Book 1, Hadith 111 (In-Book)