Repeat Example 9-4 but with the following changes to the data:
(a) SCS TR-20 methodology data
(i) Existing (preproject) Tc = 1.3 hr; change from 1.0 hr
(ii) Proposed (postproject) Tc = 0.4 hr; changed from 0.45 hr
(b) Figure E9-4(a) data
(i) Emergency spill way and basin design elevation = 229.50 ft; changed from 231.00 ft
(ii) Maximum basin depth = 14.0 ft (229.50 - 215.50) changed from 15.5 ft All other data and information remain unchanged.