Match List -I (Hydraulic structure) with List-II (Water surface profile at the structure) and select the correct answer using the codes given below the lists:
Lists - I Lists -II
A. On a flat-topped broad 1.M1
crested weir
B. Immediately below a sluice 2. M2
gate on a level apron
C. Behind the weir on a 3. S1
alluvial river
D. In a chute spillway 4. S2
5. H2
6. H3
Codes: