Name L Select all the facts about NRCS TR-SSMethod (circle the correct ones) a.
ID: 1714345 • Letter: N
Question
Name L Select all the facts about NRCS TR-SSMethod (circle the correct ones) a. TR-55 is for urban watershed hydrology method b. TR-55 requires the parameter curve number c TR-55 requires the parameter time o d. TR-55 considers the evaporation rate e. TR-55 includes the infiltration loss 2. True or false for each statement (Circle one in each);: A critical flow can never occur in the mild channel slope. b. a. (True or False) A supercritical flow is slower than the subcritical flow in a channel. (True or False) c. A supercritical flow is deeper than the subcritical flow in the same channel. (True o Fab d. A supercritical flow can only be controlled from downstream. (True or False) e. A supercritical flow can have a hydraulic jump at downstream. (True or False) A unit hydrograph represents a hydrograph of direct runoff observed at the downstream of a due to what runoff depth? (select all the possible answers) 3. a. 1 meter b. 1 inch d. 1 cm e. 1 footExplanation / Answer
1.)
a.) TR -55 is required for urban watershed hydrology method.
b.) TR-55 requires the parameter curve number.
c.) TR-55 requires the parameter time of concentration.
2.)
a.) (flase) critical flow occurs in mild slopes and Yn > Yc.
b.) (false) super critical flow have high velocity of flow but has low flow depth than sub critical flow.
c.) (false) super critical flow have high velocity of flow but has low flow depth than sub critical flow.
d.) (false) super critical flow is controlles upstream and disturbances are transmitted to downstream.
e.) (true) hydraulic jump occurs wherever a supercritical flow is taking place in a channel that doest have a steep slope enough to maintain the super critical flow. The jump provides a transition to subcritical flow from supercritical flow.
3.) Unit hydrograph is a direct runoff hydrograph resulting from one unit(one inch or one cm) of constantl intensity uniform rainfall occuring over the entire watershed.
b.(1 inch) and d.(1 cm)
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