Question

Advantages and disadvanteges of strip cropping

Answer 1

Advantages and Disadvantages:

   drop spillway:

1. suitable for a high q and low overfall height, especially if it has a box inlet
2. economical for a low overall height; a box-style inlet may be used to increase flow capacity when the upstream channel is shallow
3. can be used as a soil retention and tile outlet structure
4. can be built with various materials: concrete blocks, section of an aluminum arch, etc.
5. skilled labor is required except with the concrete block construction method
6. uses less space than the other structures
7. subject to undercutting if a stable slope is not maintained below the structure
8. economical for both a high and a high overfall height, but if only one feature is necessary other structures are more appropriate
9. usually built as a monolithic reinforced concrete structure
10. a skilled labor is required
11. need good soil conditions for foundation; still, the life expectancy is less than for the other structures
12. suitable for a high overfall height and a low
13. economical for a high overfall height
14. constructed with jointed pipe or corrugated metal pipe (CMP) with a variety of inlet and outlet choices
15. requires less material with a high overfall height than for the drop spillway
16. relative simple to construct but still needs skilled labor in most cases
17. versatile; can be used with small reservoirs, as a culvert, or as an outlet through the spoil banks of ditches
18. some space is needed above the structure for temporary storage of runoff
19. good backfill material is needed and it should be properly placed and compacted
20. the inlet opening is subject to blockage by debris