Dams in Loire Bretagne with cumulated height > altitude
which(loire$cs_height_10_n>=2*loire$altitudem) # M 0 C [1] 2289 2290 2692 2693 2694 2695 2696 2697 2698 2699 9162 9163 [13] 9164 9165 9166 9167 9168 9169 10304 12804 12805 12806 12807 12808 [25] 12809 12810 12811 12812 12813 12814 12815 12816 12817 12818 12819 12820 [37] 12821 12822 12823 12824 12825 12826 12827 12828 12829 12830 12831 12832 [49] 12833 12834 12835 14193 14194 14195 14196 14197 14198 14374 15042 15043 [61] 15044 15045 15046 15047 15048 15397 15398 15969 15970 15971 15972 20324 [73] 20325 20326 20327 20328 20329 20330 20331 20332 20333 20334 20335 20336 [85] 20337 20338 20339 20351 21682 21683 21684 21685 21686 21687 21688 21689 [97] 22538 22539 25780 26147 27798 29265 35035 35036 35037 35038 35039 36652 [109] 36653 36654 36655 36656 36657 37007 37348 37349 41444 41445 41446 41492 [121] 41493