R. Segarragarcia et Gv. Loganathan, A STOCHASTIC POLLUTANT LOAD MODEL FOR THE DESIGN OF STORMWATER DETENTION FACILITIES, Water science and technology, 29(1-2), 1994, pp. 327-335
Citations number
6
Categorie Soggetti
Water Resources","Environmental Sciences","Engineering, Civil
A set of equations dependent on specified pollutant trap efficiency fo
r computing storage capacity-treatment rate combinations of a stormwat
er detention system is provided. The equations are expressed in terms
of the statistics of the runoff event variables: mean depth, duration,
and interevent time. The hydrologic random variables are assumed to b
e independent and exponentially distributed. A mass balance equation i
s derived for the detention unit based on a first-order pollutant load
model. With the aid of statistical derived distribution techniques, a
n expression for the expected pollutant washoff load is derived, which
is further used to develop analytical storage/treatment isoquants for
specified levels of pollutant trap efficiency. The isoquants are defi
ned in terms of the design storage capacity, the treatment rate. the p
ollutant trap efficiency, and the runoff process statistics. A further
extension of the model allows the derivation of equations for the est
imation of the settling efficiency of pollutants of stored stormwater.
The estimations for storage capacity-treatment rate are obtained from
closed form expressions that, in addition. yield lower and upper boun
d estimates of the design variables. Illustrative examples using data
for catchments in Minneapolis and Denver are provided.