1.   Purpose and objectives

     The program aims at the estimation of aggregated direct runoff from small watersheds during a time interval homogeneous with respect to rainfall characteristics.

2.   Description

     The program uses the probability of exceedence of the rainfall threshold and calculates the expected direct runoff over a pre-specified period.

3.   Input

     T:             Time of interval
     PP:          Exceedence probability of rainfall threshold
     PMIN:      Minimum rainfall threshold
     NYEAR:   Number of years
     NN(I):       Number of rainfall events
     ID(I,J):      The date when Jth rainfall started
     IH(I,J):      Time when Jth rainfall started
     HT(I,J):     Rainfall depth

4.   Output

     The program results contain the following parameters:

     l:         Poisson rate
     P:       Exceedence probability rainfall threshold
     TIME:  The time of the interval
     E(x):    Mean value of rainfall depth
     THFC: Expected total direct runoff first phase
     THSC: Expected total direct runoff second phase

5.   Operational requirements and restrictions

     The program has been developed in FORTRAN. It runs under MS-DOS 2.1 or  higher. A math co-processor is necessary.

6.   Form of presentation

     Source program on diskette and program listing.

7.   Operational experience

     The program has been used in two small watersheds in Greece.

8.   Originator and technical support

     The program was developed by Prof. G. Tsakiris, National Technical  University of Athens.

9.   Availability

     From the HOMS National Reference Centre for Greece.

10.  Conditions on use

     The program will be provided at the cost of reproduction and mailing.