(Solved): Lesson 1 - Synthetic Hydrograph 1. From the basin map of a given watershed, the following quantiti ...

Lesson 1 - Synthetic Hydrograph 1. From the basin map of a given watershed, the following quantities are measured: $L=150\mathrm{km},L_c=75\mathrm{km}$, and drainage area $=3500{\mathrm{km}}^2$. From the unit hydrograph derived for the watershed, the following are determined: $t_R=12\mathrm{h},t_{pR}=34\mathrm{h}$, and peak discharge $=157.5{\mathrm{m}}^3/\mathrm{s}/\mathrm{cm}$. Determine the coefficients $C_t$ and $C_p$ for the synthetic unit hydrograph of the watershed. 2. Compute and sketch the six-hour synthetic unit hydrograph of a watershed having a drainage area of $2500{\mathrm{km}}^2$ with $L=100\mathrm{km}$ and $L_c=50\mathrm{km}$. This watershed is a subdrainage of the watershed in Part 1 above. 3. Construct a 10-minute SCS unit hydrograph for a basin of area $3.0{\mathrm{km}}^2$ and time of concentration $1.25\mathrm{h}$.