Determine the number of $ 8$-tuples of nonnegative integers $ (a_1,a_2,a_3,a_4,b_1,b_2,b_3,b_4)$ satisfying $ 0\le a_k\le k$, for each $ k \equal{} 1,2,3,4$, and $ a_1 \plus{} a_2 \plus{} a_3 \plus{} a_4 \plus{} 2b_1 \plus{} 3b_2 \plus{} 4b_3 \plus{} 5b_4 \equal{} 19$.
1. **Define new variables**: Let \( c_k = a_k + (k+1)b_k \). This transformation helps us simplify the problem by combining \( a_k \) and \( b_k \) into a single variable \( c_k \).

2. **Determine \( a_k \) and \( b_k \) from \( c_k \)**: Note that there is only one way to write \( c_k \) in the given form:
   \[
   b_k = \left\lfloor \frac{c_k}{k+1} \right\rfloor
   \]
   and
   \[
   a_k = c_k - (k+1) \left\lfloor \frac{c_k}{k+1} \right\rfloor.
   \]
   This means \( b_k \) is the number of complete times \( k+1 \) goes into \( c_k \), and \( a_k \) is the remainder of \( c_k \) upon division by \( k+1 \).

3. **Rewrite the original equation**: The original equation \( a_1 + a_2 + a_3 + a_4 + 2b_1 + 3b_2 + 4b_3 + 5b_4 = 19 \) can be rewritten using \( c_k \):
   \[
   c_1 + c_2 + c_3 + c_4 = 19.
   \]

4. **Count the number of solutions**: We need to find the number of nonnegative integer solutions to the equation \( c_1 + c_2 + c_3 + c_4 = 19 \). This is a classic "stars and bars" problem, where we distribute 19 indistinguishable stars (units) into 4 distinguishable bins (variables \( c_1, c_2, c_3, c_4 \)).

5. **Apply the stars and bars theorem**: The number of nonnegative integer solutions to \( c_1 + c_2 + c_3 + c_4 = 19 \) is given by:
   \[
   \binom{19 + 4 - 1}{4 - 1} = \binom{22}{3}.
   \]

6. **Calculate the binomial coefficient**:
   \[
   \binom{22}{3} = \frac{22 \times 21 \times 20}{3 \times 2 \times 1} = 1540.
   \]

Conclusion:
\[
\boxed{1540}
\]